In trial, people lost twice as much weight by ditching ultraprocessed food

A recent small-scale randomized controlled trial has revealed striking results: participants lost twice as much weight when consuming a diet limited to minimally processed foods compared to a diet that included ultraprocessed options, despite both diets being nutritionally comparable. This study, conducted by researchers from University College London and published in Nature Medicine, adds significant evidence to the discourse surrounding food processing and its impact on weight and overall health. The ultraprocessed foods used in this trial, while still classified as such, were relatively healthier than typical options. They encompassed items like multigrain breakfast cereal, flavored yogurt cups, packaged granola bars, and ready-made meals such as chicken sandwiches and lasagna. In contrast, the minimally processed diet provided participants with meals prepared by a caterer, featuring wholesome ingredients like overnight oats with fresh fruit, plain yogurt with nuts, handmade fruit and nut bars, and from-scratch stir fry. Both dietary plans maintained similar nutritional profiles, including levels of fat, protein, carbohydrates, and fiber, adhering closely to the UK's Eatwell Guide. The trial employed a crossover methodology, where participants were divided randomly to begin with either the ultraprocessed or minimally processed diet for eight weeks before switching. Food was delivered directly to their homes, and adherence to the diets was closely monitored through food diaries. Out of the initial participants, 50 completed at least one diet, with 43 successfully transitioning through both. The group primarily comprised women averaging 43 years of age, all classified as overweight or obese at the trial's outset. Notably, ultraprocessed foods accounted for nearly 70% of their diets before the trial, highlighting a significant shift towards healthier eating habits during the study.