🔎 What we all need to know about ultra-processed foods, explained by science writer StuartJRitchie
research. In the study, 20 people signed up to stay in a research centre for a month, eating only the foods provided to them by the researchers. Of course, this is an artificial setting, but studies like this are really the only way we can have enough control of people’s diets to properly understand what causes what.
10 of the participants ate an unprocessed diet, with three large meals per day, plus snacks, provided to them made of healthy ingredients like fresh fruit and veg, fresh eggs, grains like quinoa, and grilled meats like chicken. They could eat as much or as little as they liked. The other 10 had an ultra-processed diet, with meals and snacks containing the same number of calories and amounts of sugar, fat, and other nutrients as the unprocessed group, but consisting of foods from tins or packets, as well as burgers, chips, crisps, and sausages. Again, they didn’t need to eat the full amount presented to them, but could if they wanted.
After two weeks, the groups switched over to the other type of diet, so that by the end of the month everyone had had a fortnight of processed and a fortnight of unprocessed food. The results? On average, the participants gained nearly a kilogram during the ultra-processed fortnight, and lost around the same amount when eating unprocessed foods. They’d eaten substantially more calories when on the ultra-processed diet, even though they could in theory have consumed the exact same number in both groups.
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