Some dark chocolates contain heavy metals. Should you be concerned?

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Wednesday, July 31, 2024

An eight-year study conducted by researchers at George Washington University and ConsumerLab, a company that tests and evaluates health foods and supplements, found certain dark chocolates and cocoa products contain amounts of lead and cadmium that are above California’s strict regulations on the heavy metals.“The amount of lead that was found, in general, was not alarming,” said Leigh Frame, the co-lead author of the study and the executive director of the office of integrative medicine and health at George Washington University. “But most people probably don’t have a great handle on what their heavy metal exposure is.”The study’s findings are not a reason to stop eating dark chocolate, Frame said. Some studies suggest flavonoids found in dark chocolate may lower the risk of heart disease and high blood pressure.But these small exposures to heavy metals, plus other exposures in an individual’s diet, could amount to higher blood lead levels over time. “And that is something that we all need to be aware of,” Frame said.“I would not want someone to be afraid of chocolate. That would be the worst thing that could come out of the study to me,” she said. “Frankly, it’s a small contributor to our diet.”The factsConsumerLabs selected cocoa products to test largely using a ranked survey completed by thousands of respondents on the company’s website every year, the researchers write in the study.ConsumerLabs purchased the products and paid for them to be tested at two independent labs, Frame said. Researchers at George Washington University analyzed the results, without knowing the names and brands of the products that were tested.Forty-three percent of the 72 cocoa-containing products had amounts of lead that exceed California’s maximum allowable dose level for the heavy metal, which is 0.5 micrograms per day. Thirty-five percent of the products had amounts of cadmium that exceed California’s rules.Seventy of the 72 products tested contained amounts of lead lower than the Food and Drug Administration’s benchmark of 2.2 micrograms per day for children. The benchmark is set nearly 10 times lower than the amount of lead from food required to meet the marker the Centers for Disease Control and Prevention uses to identify high blood lead levels.Some samples had “much higher” levels of lead and other heavy metals detected; there was “a bit of variability” in dark chocolate and other cocoa products, Frame said. One sample tested had 3.13 micrograms of lead per serving, the highest detected in the study.The researchers say the heavy metals detected “may not pose any appreciable risk for the average person when consumed as a single-serving.”Jacob Hands, the co-lead author of the study and a medical student at George Washington University School of Medicine and Health Sciences, said the researchers chose California’s regulation for the analysis because it is a conservative estimate. Frame also said the state’s regulation is what is generally used in other studies.The study was published in the journal Frontiers in Nutrition on Wednesday.Hands is a contract researcher for Consumer Labs.BackgroundThe George Washington University study follows the findings of a 2022 investigation by Consumer Reports that detected cadmium and lead in all of the 28 dark chocolate bars tested, as well as follow-up testing of 48 cocoa-containing products in 2023.In response to questions about the GWU study, an FDA spokesperson said, “while the presence of cadmium and lead in chocolate has been the subject of considerable media attention, experts from around the world have found that chocolate is a minor source of exposure to these contaminants internationally.”Chocolate, or cocoa, has been historically used as a medicine to treat fatigue and improve digestion. And studies suggest flavonoids found in cocoa can lower the risk of heart disease, high blood pressure and diabetes. But the type of chocolate matters; darker chocolate often contains higher amounts of cocoa and more flavonoids.Chronic exposure to lead and cadmium is associated with kidney dysfunction and other health problems. Infants, young children and pregnant people can be particularly vulnerable because prolonged lead exposure in early development has been associated with a higher risk of learning disabilities or lower IQ levels.Young children in the United States are eating and drinking far less lead than they did decades ago — from 43 micrograms per day in 1980, to around 1 microgram per day in 2016 — according to the FDA.However, lead contamination in food products remains a concern. In the fall, the FDA warned of “extremely high” levels of lead detected in three brand names of cinnamon applesauce puree pouches. And the agency continues to send public health alerts recommending that consumers stop using and dispose of certain ground cinnamon products contaminated with lead.Frame said the good news is kids generally don’t like eating dark chocolate. The darker the chocolate, the more the cocoa powder and the potential for higher amounts of lead, cadmium or other metals.“I don’t think we need to worry as much about kids,” Frame said.And cocoa powders — such as mixes used for hot chocolate — are often more akin to milk chocolate with less raw cocoa than dark chocolate, she said.What the industry saysChristopher Gindlesperger, the senior vice president of public affairs and communications for the National Confectioners Association, the trade organization for the candy industry in the United States, said chocolate and cocoa are safe to eat, and food safety and product quality “remain our highest priorities.”“Consumers understand that chocolate and candy are occasional treats and not center-of-the-plate foods,” Gindlesperger wrote in an email.Why are heavy metals in dark chocolate?Cadmium in the soil can transfer into a cacoa tree growing there, leading to a “natural contamination,” said Tewodros Godebo, an assistant professor of environmental health sciences at Tulane University School of Public Health and Tropical Medicine.Lead, though, appears to be introduced during the production of cocoa products, not from the soil, but potentially during drying, processing or packaging, Godebo said.What other experts are sayingKatarzyna Kordas, an associate professor of epidemiology and environmental health at University of Buffalo, said in an email that the study’s findings demonstrate “not all chocolate or cocoa products are created equal.” Some contain more metal than others.The amount of a metal someone is exposed to is a function of how much of the contaminant is in the food, how much the person consumes and whether they’re eating on an empty or full stomach, Kordas said. “We tend to absorb proportionally more metals on an empty stomach,” she said.But the amount of lead or cadmium detected in the study is often below stringent reference values and that suggests “the level of concern may be low,” Kordas said.Godebo said California’s regulations on heavy metals are “very conservative,” making it difficult to translate what the amounts of cadmium or lead mean for the general population. People are exposed to metals every day, and other types of foods, vegetables and fruits can be more significant sources of heavy metals, he said.“Of course, we want a negligible amount of exposure,” Godebo said. “But, literally, it’s impossible.”In a study published in June, Godebo and other researchers at Tulane University tested 155 dark and milk chocolates for lead and other heavy metals and concluded eating one ounce of dark chocolate a day “poses no health concerns for adults.” The researchers also determined four of the chocolate bars tested had cadmium levels that could pose a risk to young children.“What we’ve found is that it’s quite safe to consume dark and milk chocolates,” Godebo said in a statement in June about the study.Should I eat dark chocolate?Frame said she continues to eat chocolate.People can eat a diverse diet of different foods to reduce any potential exposure to lead, or other heavy metals, from a part of their diet, Frame said.Anyone concerned about their exposure to lead, cadmium or other metals should ask their physician for a blood test, Frame said. “Then you’ll have a ground truth,” to determine whether relatively small exposures in your diet could be adding up to higher blood lead levels.“I think it’s pretty clear, actually, that having one ounce of chocolate a day is not detrimental,” Frame said. But people can be cognizant of how much they’re having and how often, she said.Frame said she eats chocolate every other day.“It makes it feel more like a treat,” she said.

Researchers discovered lead and cadmium in tested cocoa products, but the levels are not alarming, they said.

An eight-year study conducted by researchers at George Washington University and ConsumerLab, a company that tests and evaluates health foods and supplements, found certain dark chocolates and cocoa products contain amounts of lead and cadmium that are above California’s strict regulations on the heavy metals.

“The amount of lead that was found, in general, was not alarming,” said Leigh Frame, the co-lead author of the study and the executive director of the office of integrative medicine and health at George Washington University. “But most people probably don’t have a great handle on what their heavy metal exposure is.”

The study’s findings are not a reason to stop eating dark chocolate, Frame said. Some studies suggest flavonoids found in dark chocolate may lower the risk of heart disease and high blood pressure.

But these small exposures to heavy metals, plus other exposures in an individual’s diet, could amount to higher blood lead levels over time. “And that is something that we all need to be aware of,” Frame said.

“I would not want someone to be afraid of chocolate. That would be the worst thing that could come out of the study to me,” she said. “Frankly, it’s a small contributor to our diet.”

The facts

  • ConsumerLabs selected cocoa products to test largely using a ranked survey completed by thousands of respondents on the company’s website every year, the researchers write in the study.
  • ConsumerLabs purchased the products and paid for them to be tested at two independent labs, Frame said. Researchers at George Washington University analyzed the results, without knowing the names and brands of the products that were tested.
  • Forty-three percent of the 72 cocoa-containing products had amounts of lead that exceed California’s maximum allowable dose level for the heavy metal, which is 0.5 micrograms per day. Thirty-five percent of the products had amounts of cadmium that exceed California’s rules.
  • Seventy of the 72 products tested contained amounts of lead lower than the Food and Drug Administration’s benchmark of 2.2 micrograms per day for children. The benchmark is set nearly 10 times lower than the amount of lead from food required to meet the marker the Centers for Disease Control and Prevention uses to identify high blood lead levels.
  • Some samples had “much higher” levels of lead and other heavy metals detected; there was “a bit of variability” in dark chocolate and other cocoa products, Frame said. One sample tested had 3.13 micrograms of lead per serving, the highest detected in the study.
  • The researchers say the heavy metals detected “may not pose any appreciable risk for the average person when consumed as a single-serving.”
  • Jacob Hands, the co-lead author of the study and a medical student at George Washington University School of Medicine and Health Sciences, said the researchers chose California’s regulation for the analysis because it is a conservative estimate. Frame also said the state’s regulation is what is generally used in other studies.

The study was published in the journal Frontiers in Nutrition on Wednesday.

Hands is a contract researcher for Consumer Labs.

Background

The George Washington University study follows the findings of a 2022 investigation by Consumer Reports that detected cadmium and lead in all of the 28 dark chocolate bars tested, as well as follow-up testing of 48 cocoa-containing products in 2023.

In response to questions about the GWU study, an FDA spokesperson said, “while the presence of cadmium and lead in chocolate has been the subject of considerable media attention, experts from around the world have found that chocolate is a minor source of exposure to these contaminants internationally.”

Chocolate, or cocoa, has been historically used as a medicine to treat fatigue and improve digestion. And studies suggest flavonoids found in cocoa can lower the risk of heart disease, high blood pressure and diabetes. But the type of chocolate matters; darker chocolate often contains higher amounts of cocoa and more flavonoids.

Chronic exposure to lead and cadmium is associated with kidney dysfunction and other health problems. Infants, young children and pregnant people can be particularly vulnerable because prolonged lead exposure in early development has been associated with a higher risk of learning disabilities or lower IQ levels.

Young children in the United States are eating and drinking far less lead than they did decades ago — from 43 micrograms per day in 1980, to around 1 microgram per day in 2016 — according to the FDA.

However, lead contamination in food products remains a concern. In the fall, the FDA warned of “extremely high” levels of lead detected in three brand names of cinnamon applesauce puree pouches. And the agency continues to send public health alerts recommending that consumers stop using and dispose of certain ground cinnamon products contaminated with lead.

Frame said the good news is kids generally don’t like eating dark chocolate. The darker the chocolate, the more the cocoa powder and the potential for higher amounts of lead, cadmium or other metals.

“I don’t think we need to worry as much about kids,” Frame said.

And cocoa powders — such as mixes used for hot chocolate — are often more akin to milk chocolate with less raw cocoa than dark chocolate, she said.

What the industry says

Christopher Gindlesperger, the senior vice president of public affairs and communications for the National Confectioners Association, the trade organization for the candy industry in the United States, said chocolate and cocoa are safe to eat, and food safety and product quality “remain our highest priorities.”

“Consumers understand that chocolate and candy are occasional treats and not center-of-the-plate foods,” Gindlesperger wrote in an email.

Why are heavy metals in dark chocolate?

Cadmium in the soil can transfer into a cacoa tree growing there, leading to a “natural contamination,” said Tewodros Godebo, an assistant professor of environmental health sciences at Tulane University School of Public Health and Tropical Medicine.

Lead, though, appears to be introduced during the production of cocoa products, not from the soil, but potentially during drying, processing or packaging, Godebo said.

What other experts are saying

Katarzyna Kordas, an associate professor of epidemiology and environmental health at University of Buffalo, said in an email that the study’s findings demonstrate “not all chocolate or cocoa products are created equal.” Some contain more metal than others.

The amount of a metal someone is exposed to is a function of how much of the contaminant is in the food, how much the person consumes and whether they’re eating on an empty or full stomach, Kordas said. “We tend to absorb proportionally more metals on an empty stomach,” she said.

But the amount of lead or cadmium detected in the study is often below stringent reference values and that suggests “the level of concern may be low,” Kordas said.

Godebo said California’s regulations on heavy metals are “very conservative,” making it difficult to translate what the amounts of cadmium or lead mean for the general population. People are exposed to metals every day, and other types of foods, vegetables and fruits can be more significant sources of heavy metals, he said.

“Of course, we want a negligible amount of exposure,” Godebo said. “But, literally, it’s impossible.”

In a study published in June, Godebo and other researchers at Tulane University tested 155 dark and milk chocolates for lead and other heavy metals and concluded eating one ounce of dark chocolate a day “poses no health concerns for adults.” The researchers also determined four of the chocolate bars tested had cadmium levels that could pose a risk to young children.

“What we’ve found is that it’s quite safe to consume dark and milk chocolates,” Godebo said in a statement in June about the study.

Should I eat dark chocolate?

Frame said she continues to eat chocolate.

People can eat a diverse diet of different foods to reduce any potential exposure to lead, or other heavy metals, from a part of their diet, Frame said.

Anyone concerned about their exposure to lead, cadmium or other metals should ask their physician for a blood test, Frame said. “Then you’ll have a ground truth,” to determine whether relatively small exposures in your diet could be adding up to higher blood lead levels.

“I think it’s pretty clear, actually, that having one ounce of chocolate a day is not detrimental,” Frame said. But people can be cognizant of how much they’re having and how often, she said.

Frame said she eats chocolate every other day.

“It makes it feel more like a treat,” she said.

Read the full story here.
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Dear Doctor: Sun exposure is the primary cause of thinning skin

"Could I take vitamin K or increase my platelets to limit this happening?"

DEAR DR. ROACH: I thought you could help with a stubborn problem. I am a healthy and active 78-year-old woman who, I admit, likes to look younger than my age. The problem is my skin, especially on my hands and arms; I get these bruises that look unsightly and take a while to resolve. I hear it is from age-related thin skin. My friends of this generation also complain about these red spots or bruises. They don’t hurt.Could I take vitamin K or increase my platelets so as to limit their happening? I’ve read not to take aspirin or any pain reliever. Is there any medicine to take to help my blood coagulate better or make my skin thicker? -- S.M.ANSWER: This common problem is called solar purpura, and it is largely the sun causing the damage to the skin, thinning it with age. Avoiding the sun and moisturizing your skin diligently can reduce the risk of this happening. Once it’s happened, these measures are still important for preventing it from getting worse.You should still avoid the sun and moisturize to prevent the condition from worsening. One study showed that bioflavinoid supplements helped reduce new bruises. These aren’t particularly expensive, but you can also get them through food, specifically citrus and other fruits.Vitamin K deficiency causes clotting problems, but taking more vitamin K doesn’t help. Aspirin does reduce the effectiveness of platelets, but if you are prescribed it (for blockages in the heart, for example), you should definitely keep taking it. Occasional ibuprofen has little effect on platelets, and acetaminophen (Tylenol) has none.DEAR DR. ROACH: For years, I have been plagued by a chronic nasal drip. It’s usually most present in the mornings, though it seems to be intermittent during the day. I frequently have to wipe or blow my nose. I thought it might be due to allergies, so I have been taking a Zyrtec tablet every morning. But it doesn’t seem to have any effect.I talked with my primary care physician about this, but he didn’t have any recommendations. I don’t know what is going on or how to stop this. Do you have any recommendations? -- R.M.ANSWER: An antihistamine like Zyrtec is a reasonable thing to try as allergic rhinitis often responds to antihistamines. (We just love our Latin and Greek names, and “rhinitis” comes from the Greek roots for “inflammation of the nose.”) Since an antihistamine didn’t work, it seems likely that you might have nonallergic rhinitis, and a nasal spray like ipratropium is usually effective for this.I also recommend azelastine nasal spray, which is now available over the counter as “Astepro.” There are some steps you can do to help your environmental risk, such as reducing dust and avoiding excess dryness.I warn people against the habitual use of nasal decongestants like Afrin, which should only be used for a day or two -- never more than three. Once the body gets used to it, nasal congestion will worsen every time a person tries to go without it.If the nasal spray doesn’t do the job, I’d recommend an evaluation by an expert, such as an otorhinolaryngologist, who may need to look for nasal polyps, laryngopharyngeal reflux, and other less-common causes.Dr. Roach regrets that he is unable to answer individual letters, but will incorporate them in the column whenever possible. Readers may email questions to ToYourGoodHealth@med.cornell.edu or send mail to 628 Virginia Dr., Orlando, FL 32803.(c) 2022 North America Syndicate Inc.All Rights Reserved

Ashland Earth Day celebrants find ways to help the planet, say ‘hang in there’

Ashland is a year-round Earth Day with "people who are creating organic, local, sustainable food, drink and music," said A Street Block Party participant Emily Simon.

Joe Bianculli participated in the first Earth Day on April 22, 1970, and 55 years later, he was handing out environmental-action information to throngs of people attending Ashland’s first Earth Day A Street Block Party. Biancelli, who lives in Ashland and volunteers for Klamath-Siskiyou Wildlands (“KS Wild”), said on Tuesday, “We had high hopes for saving the planet and we still have high hopes. It’s getting tougher and tougher every year, but we all have to hang in there.”The ecologically focused event in the historic Railroad District stretched for blocks along A Street, past the Ashland Food Co-op and Masala Bistro to the KS Wild open house, where Biancelli handed out stickers that read “Love where you live, defend what you love” in the front yard as the bluegrass band Eight Dollar Mountain performed in the backyard.About 1,000 people attended the free outdoor event organized by Karolina Lavagnino of Wild Thyme Productions.People chatted in line to order from the Tacos Libertad food truck in the parking lot used year round by customers of Get ‘N Gear second-hand outdoor equipment and clothing stores. Near an outdoor display of used kayaks and bikes for sale, volunteers of Ashland Devo explained the group’s mission: to cultivate grit, resilience and camaraderie in youth through the sport of mountain biking. Board member Moneeka Settles said Earth Day is simple: It’s a chance to “gather together and celebrate Earth.”Across A Street, in a lot next to the Ashland Yoga Center, Suzee Grilley was leading Elbow Room Taiko drummers, who captivated a large crowd with their rhythmic sound and dramatic movements around barrel-shaped drums.“We always celebrate Earth Day,” said Grilley. “We feel a lot of our music expresses a communing with nature, and the sprits that animate nature, from the trees, to the sky, to the water, to the earth itself, to human beings and animals.”She said the drums the group play reflect nature. “Every one of our drums is made of wood, skin and metal, and crafted with love and prayer by an artisan,” she said.Vince DiFrancesco of the Siskiyou Mountain Club, which works to maintain more than 400 miles of backcountry trails, welcomed people to his booth set up between the Grange Co-op and Ace Hardware.DiFrancesco sees Earth Day as a time for public service. “It’s about getting out and doing work on public lands to keep them open for recreation for everybody,” he said. Nearby, musician Gatore Mukarhinda drummed a heartbeat and sang a love song to Mother Earth. “She says, ‘take care of me,’” he said.Aubrey Laughlin of Talent, who had recently volunteered for Siskiyou Mountain Club trail work, said the idea for Earth Day was about “looking out for the next generation and connecting with each other, the place we live and our community.” Marie DeGregorio of Medford, who also attended the street party, said the day reminds people that “the planet needs help and we are stewards.”Party goer Susan Cox of Ashland agreed. To her, the day means “taking care of the planet, and each one of us doing our part as best we can and keeping it happy.” Yu Kuwabara of Ashland, who rode his bike to the event, said “Earth Day is a celebration of getting outside and enjoying the community.” Plenty of people rolled into the event on bikes, and Piccadilly Cycles provided free bike valet parking in front of its store.People gathered around booths displaying handmade jewelry and vendors selling treats like vegan- and gluten-free Plant Baked cookies, donuts, blueberry limoncello squares and cinnamon swirl loaves.Bloomsbury Books, a landmark independent bookstore on Ashland’s East Main Street, had a pop-up shop with nature-focused books. Earth Day is a day to learn about the environment, said bookstore co-owner Megan Isser. “Come read,” she said, gesturing to a table with copies of books, including “Garden Guide for the Rogue Valley,” published by the Jackson County Master Gardener Association with support from the Oregon State University Extension Service. Adults tasted small-batch wines from Circadian Cellars at the Ashland Recycled Furniture store, and mocktails by Hummingbird Heart Co. in a lot near Fourth Street.Creekside Strings fiddlers kicked off the event around 4 p.m. with traditional tunes in front of La Baguette Music Cafe, well known for its weekly jazz sessions. The event ended there too at 7:30 p.m. after a performance by folk duo Jenika Smith and Simon Chrisman.To block party participant Emily Simon, the best place to be on Earth Day was in Ashland, where she lives and supports sustainable businesses year round. “It’s such a wonderful event to be out here with our neighbors,” she said, “and celebrating the Earth with people who are creating organic, local, sustainable food, drink and music.”Upcoming Earth Day events:ScienceWorks Hands-on Museum hosts its annual Earth Day celebration 3:30-7 p.m. Friday, April 25, with activities highlighting the science of sustainability at 1500 E. Main St. in Ashland (541-482-6767). Parking is limited and people are encouraged to walk, bike, carpool or use public transit.Pollinator Project Rogue Valley holds its spring native plant sale 10 a.m.-2 p.m. Sunday, April 27, with five growers offering a large selection of plants (listed here) native to the southern Oregon bioregion in the parking lot behind The Pollination Place at 312 N. Main St., Phoenix.See more events statewide at oregonlive.com.Here is Oregon: Southern Oregon— Janet Eastman covers design and trends. Reach her at 503-294-4072, jeastman@oregonian.com and follow her on X @janeteastman.

Trump Administration Plans Ban on More Synthetic Food Dyes

By I. Edwards HealthDay ReporterTUESDAY, April 22, 2025 (HealthDay News) — The Trump administration is expected to take new steps to remove...

TUESDAY, April 22, 2025 (HealthDay News) — The Trump administration is expected to take new steps to remove artificial food dyes from the U.S. food supply, officials say.This follows a major move by the U.S. Food and Drug Administration (FDA) in January, under former President Joe Biden, to ban red dye No. 3 in food, drinks and some drugs. That action came more than 30 years after research linked the dye to cancer in animals.Now, federal officials appear ready to go even farther. Kennedy has been an outspoken critic of petroleum-based synthetic dyes, which are used to make foods and drinks look more appealing to consumers.In March, Kennedy supported a new West Virginia law banning some of these dyes. It made West Virginia the first state to take such broad action. Studies have linked some food dyes to behavior and learning issues in children, CNN reported.More than half of U.S. states, including both Republican- and Democrat-led ones, are pushing to restrict these ingredients, according to the Environmental Working Group (EWG).In a March email to CNN, the National Confectioners Association said while states have a role to play in the nation's food system, "the FDA is the rightful national regulatory decision maker and leader in food safety." Some of the association's members sell products that contain artificial dyes.John Hewitt of the Consumer Brands Association also urged the FDA to take the lead, saying the agency should “aggressively acknowledge its responsibility as the nation’s food safety regulator.”Artificial dyes such as red No. 3, red No. 40, green No. 3 and blue No. 2 have been linked to cancer or tumors in animals. Others, like yellow No. 5 and yellow No. 6, may contain cancer-causing chemicals. Even tiny amounts of yellow No. 5 can cause restlessness or sleep problems in sensitive children, CNN reported.Marion Nestle, a well-known food policy expert, welcomed the plan.“Non-petroleum substitute dyes are available and used widely in other countries by the same companies that sell products here," she said. "Companies have been promising to get rid of the petroleum dyes for years. The time has come.”In public health terms, “this is low-hanging fruit," Nestle added. "I want to see RFK Jr. take on ultra-processed foods, a much tougher problem and a far more important one.”Most of these dyes are used in low-nutrition foods like candy and soda, but they may also appear in less colorful products, the Center for Science in the Public Interest says.People who want to avoid these dyes can check ingredient labels on food and drink packaging, CNN said.SOURCE: CNN, April 22, 2025Copyright © 2025 HealthDay. All rights reserved.

Mission to boldly grow food in space labs blasts off

The mission will explore new ways of reducing the cost of feeding an astronaut.

Mission to boldly grow food in space labs blasts offBBC NewsArtwork: The experiment will orbit the Earth for three hours before returning to Earth and splashing down off the coast of PortugalSteak, mashed potatoes and deserts for astronauts could soon be grown from individual cells in space if an experiment launched into orbit today is successful.A European Space Agency (ESA) project is assessing the viability of growing so-called lab-grown food in the low gravity and higher radiation in orbit and on other worlds.ESA is funding the research to explore new ways of reducing the cost of feeding an astronaut, which can cost up to £20,000 per day.The team involved say the experiment is a first step to developing a small pilot food production plant on the International Space Station in two years' time.Lab-grown food will be essential if Nasa's objective of making humanity a multi-planetary species were to be realised, claims Dr Aqeel Shamsul, CEO and founder of Bedford-based Frontier Space, which is developing the concept with researchers at Imperial College, London."Our dream is to have factories in orbit and on the Moon," he told BBC News."We need to build manufacturing facilities off world if we are to provide the infrastructure to enable humans to live and work in space".NASAAstronauts enjoy eating in zero gravity, but the freeze-dried food itself is not much fun to eatLab-grown food involves growing food ingredients, such as protein, fat and carbohydrates in test tubes and vats and then processing them to make them look and taste like normal food.Lab-grown chicken is already on sale in the US and Singapore and lab grown steak is awaiting approval in the UK and Israel. On Earth, there are claimed environmental benefits for the technology over traditional agricultural food production methods, such as less land use and reduced greenhouse gas emissions. But in space the primary driver of is to reduce costs.The researchers are doing the experiment because it costs so much to send astronauts food on the ISS - up to £20,000 per astronaut per day, they estimate. Nasa, other space agencies and private sector firms plan to have a long-term presence on the Moon, in orbiting space stations and maybe one day on Mars. That will mean sending up food for tens and eventually hundreds of astronauts living and working in space – something that would be prohibitively expensive if it were sent up by rockets, according to Dr Shamsul.Growing food in space would make much more sense, he suggests."We could start off simply with protein-enhanced mashed potatoes on to more complex foods which we could put together in space," he tells me."But in the longer term we could put the lab-grown ingredients into a 3D printer and print off whatever you want on the space station, such as a steak!"Lab-grown steak can be produced on Earth, but can it be created in space?This sounds like the replicator machines on Star Trek, which are able to produce food and drink from pure energy. But it is no longer the stuff of science fiction, says Dr Shamsul.He showed me a set-up, called a bioreactor, at Imperial College's Bezos Centre for Sustainable Proteins in west London. It comprised a brick-coloured concoction bubbling away in a test tube. The process is known as precision fermentation, which is like the fermentation used to make beer, but different: "precision" is a rebranding word for genetically engineered.In this case a gene has been added to yeast to produce extra vitamins, but all sorts of ingredients can be produced in this way, according to Dr Rodrigo Ledesma-Amaro, Director of the Bezos Centre."We can make all the elements to make food," says Dr Ledesma-Amaro proudly."We can make proteins, fats, carbohydrates, fibres and they can be combined to make different dishes."The brick-coloured "food" is grown in a small biorector, a mini-version of which has been sent into space A much smaller, simpler version of the biorector has been sent into space on a SpaceX Falcon 9 rocket as part of the ESA mission. There is plenty of evidence that that foods can be successfully grown from cells on Earth, but can the process be repeated in the weightlessness and higher radiation of space?Drs Ledesma-Amaro and Shamsul have sent small amounts of the yeast concoction to orbit the Earth in a small cube satellite on board Europe's first commercial returnable spacecraft, Phoenix. If all goes to plan, it will orbit the Earth for around three hours before falling back to Earth off the coast of Portugal. The experiment will be retrieved by a recovery vessel and sent back to the lab in London to be examined.The data they gather will inform the construction of a larger, better bioreactor which the scientists will send into space next year, according to Dr Ledesma-Amaro.The problem, though, is that the brick-coloured goo, which is dried into a powder, looks distinctly unappetising – even less appetising than the freeze-dried fare that astronauts currently have to put up with.That is where Imperial College's master chef comes in. Jakub Radzikowski is the culinary education designer tasked with turning chemistry into cuisine.Kevin ChurchImperial College's master chef has the job of making lab-grown chemicals into delicious dishesHe isn't allowed to use lab grown ingredients to make dishes for people just yet, because regulatory approval is still pending. But he's getting a head start. For now, instead of lab-grown ingredients, Jakub is using starches and proteins from naturally occurring fungi to develop his recipes. He tells me all sorts of dishes will be possible, once he gets the go-ahead to use lab-grown ingredients."We want to create food that is familiar to astronauts who are from different parts of the world so that it can provide comfort."We can create anything from French, Chinese, Indian. It will be possible to replicate any kind of cuisine in space."Today, Jakub is trying out a new recipe of spicy dumplings and dipping sauce. He tells me that I am allowed to try it them out, but taster-in-chief is someone far more qualified: Helen Sharman, the UK's first astronaut, who also has a PhD in chemistry.Kevin Church/BBC NewsBritain's first astronaut, Helen Sharman and I taste test what might be the space food of the futureWe tasted the steaming dumplings together. My view: "They are absolutely gorgeous!"Dr Sharman's expert view, not dissimilar: "You get a really strong blast from the flavour. It is really delicious and very moreish," she beamed."I would love to have had something like this. When I was in space, I had really long-life stuff: tins, freeze dried packets, tubes of stuff. It was fine, but not tasty."Dr Sharman's more important observation was about the science. Lab-grown food, she said, could potentially be better for astronauts, as well as reduce costs to the levels required to make long-term off-world habitation viable.Research on the ISS has shown that the biochemistry of astronauts' bodies changes during long duration space missions: their hormone balance and iron levels alter, and they we lose calcium from their bones. Astronauts take supplements to compensate, but lab-grown food could in principle be tweaked with the extra ingredients already built in, says Dr Sharman."Astronauts tend to lose weight because they are not eating as much because they don't have the variety and interest in their diet," she told me."So, astronauts might be more open to having something that has been cooked from scratch and a feeling that you are really eating wholesome food."

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