Virginia Messina, MPH, RD, points out that eating healthy whole foods is important—and so is paying attention to individual nutrients. Lately, though, that’s become an unpopular thing to say. It’s what food activists like Michael Pollan refer to as “nutritionism.” That is, he and others say we should stop worrying so much about nutrients and just eat food (or “real” food as they refer to it). The diets that have long protected the health of people in Asia and southern Europe are based on whole plant foods, but they aren’t vegan. A vegan diet omits foods that are traditional sources of nutrients in cultural plant-based diets. And, when people stop eating animal foods they need to know a few things about nutrients. For example, they need to know that it is important to include legumes—at least 3 servings—in vegan diets to get adequate amounts of all amino acids. They need to know which leafy greens provide calcium that is actually absorbed by the body. They need to know which type of vitamin B12 supplement is the best and how much is required. See more about Why Nutrition and Nutritionism Matter.