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The story of three men's life-long search for a diet, which is good for our health, good for the environment and good for the future of the planet. The film features the ground-breaking work of Dr. T Colin Campbell in China exploring the link between diet and disease, Dr. Caldwell Esselstyn's use of diet to treat heart disease patients, and Professor Gidon Eshel's investigations into how our food choices contribute to global warming, land use and oceanic dead zones.