The Claim
In young overweight Japanese men, a one-week diet of ultra-processed foods results in an average weight gain of 1.1 kg and an increase in daily energy intake of 813.5 kcal compared to a diet of non-ultra-processed foods.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Young overweight Japanese men who ate ultra-processed foods for one week gained 1.1 kilograms on average and consumed 813.5 more calories per day than when they ate non-ultra-processed foods.
See the scientific wording
In young overweight Japanese men, consuming ultra-processed foods for one week leads to an average weight gain of 1.1 kg and an increase in daily energy intake of 813.5 kcal compared to a diet of non-ultra-processed foods, suggesting that the structural and nutritional properties of ultra-processed foods may promote overeating and fat accumulation in this population.
Ultra-processed foods are softer and contain less fiber, so people chew them less and eat them faster. This means the stomach and intestines don't get stretched enough or signaled properly, so the body doesn't release enough fullness hormones. As a result, people keep eating without feeling full, take in more calories than needed, and gain weight.
What the research says
1 studyWhen overweight Japanese men ate ultra-processed foods for a week, they naturally ate more calories and gained weight—even though they weren’t told to eat more—suggesting that these foods make people hungry or less full, leading to overeating.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.