The findings will force scientists to rethink the complicated relationship between dietary habits and health.
A shopper carries frozen pizza in his supermarket basket. A new clinical trial found that people whose diet consisted of ultra-processed foods consumed 508 more calories per day than people who ate unprocessed foods.
The American diet has changed drastically over the past century. Home-grown produce and local poultry have given way to canned vegetables and deep-fried chicken tenders. Doctors have long suspected that changes in food preparation were among the key contributors to the obesity epidemic, but they’ve struggled to find ways to reverse the trend., more than double the percentage in 1980, according to the Centers for Disease Control and Prevention.
“I thought it would be a no-brainer that people simply liked the ultra-processed foods better,” Hall said. “My first hypothesis went right out the window.” Snacks included raw nuts and fruit for the unprocessed diet, but dry roasted peanuts and applesauce for the other. Hall said the discrepancy could be due to differences in the foods’ texture. Ultra-processed foods are generally softer, and people tend to eat soft foods quickly. That means volunteers would have swallowed more food by the time their guts were able to register their fullness and send signals to the brain that eating should stop.
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People consume 500 more calories a day when eating ultraprocessed foods, study findsSuch people also tend to eat more quickly and consume more fats and carbohydrates, researchers say. 'It's not just the extra salt and fat in processed food that causes people to gain weight. It's the processed food itself.'
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