Instead of prescribing a set number of calories on “fasting” days, which many people find difficult to calculate outside of a study setting, a pair of Iranian researchers came upon the idea of unlimited above-ground vegetables. Starchy root vegetables are relatively calorie-dense compared to veggies that grow above the ground, including stem vegetables like celery and rhubarb, flowering vegetables like cauliflower, leafy vegetables like, well, leafy vegetables, and all the fruits we tend to think of as vegetables, such as tomatoes, peppers, okra, eggplants, string beans, summer squash, and
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