Popeye was right about spinach: dark green, leafy vegetables are the healthiest food on the planet. As whole foods go, they offer the most nutrition per calorie.
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About Michael Greger
Michael Greger was American physician, author, and speaker on public health. Michael Herschel Greger is an American physician, author, and speaker on public health issues best known for his advocacy of a whole-food, plant-based diet, and his opposition to animal-derived food products. Read more on Wikipedia →