One study analyzed whether certain foods were more or less likely to promote weight gain. Obesity rates are low. Food choice is as much about what is available to be eaten as it is about what a species evolved to eat. People at Ohalo II on the shore of the Sea of Galilee ate wheat and barley during the peak of the last ice age, more than 10, years before these grains were domesticated. Pontzer and his colleagues analyzed data on hunter-gatherers and other small-scale societies across the globe, from South America to Africa and Australia. In general, they eat a lot more fiber than the average American. We’re a work in progress. In a study of over , healthy women and men spanning 20 years, researchers determined that weight change was most strongly associated with the intake of potato chips, potatoes, sugar-sweetened beverages, and both processed and unprocessed red meats. Researchers say the method is a cheap and effective way to measure cortisol levels. Studies show, for example, that the greater the variety of food choices in front of us, the longer it takes to feel full, a phenomenon known as sensory specific satiety.
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