Mass-produced foods also line the shelves of nearly every grocery aisle. "A lot of what you see in the supermarket I would argue is not really food," Michael says. "It's what I call edible, food-like substances."

These products comprise of what Michael calls the "Western diet." "It was really invented about a hundred years ago. It means lots of processed food and meat, lots of added fat and sugar," he says. "Lots of everything except fruits, vegetables and whole grains."

Though some foods are engineered to be fat-free, Michael says it's important to note many of these products swap fat for sugar. "There are now 99 percent fat-free yogurts that have more calories than full-fat yogurt because of sugar," he says. "That's why [during] this low-fat kick we've been on for 40 years, we've gotten really fat."


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