"What we're trying to figure out is, very specifically, what is it about ultra-processed foods that seems to drive over-consumption and weight gain?" metabolism researcher Kevin Hall recently told Business Insider.
The early findings offer some hints about why UPFs can not only lead to weight gain but also make it hard to dump fat. The study is also showing that simple tweaks could make a huge difference.
On an ultra-processed diet, patients gained 2 lbs a week. During their week of unprocessed meals, full of fresh vegetables, beans, legumes, and whole grains, participants ate an average of 2,700 calories per day.
That changed when they switched to an 80% ultra-processed diet. The patients ended up consuming more food to achieve the same level of fullness - ingesting about 3,700 calories per day on average.
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