Why junk food makes you gain weight
The role of ultra-processed food in obesity
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Even small daily excesses from ultra-processed foods (as little as 100–200 extra calories) can lead to noticeable weight gain over months.
Most people think weight gain requires binge eating—but this shows tiny, daily imbalances from processed foods add up silently.
Practical Takeaways
Swap one ultra-processed snack per day for a whole food—e.g., replace chips with nuts or yogurt with fruit.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Even small daily excesses from ultra-processed foods (as little as 100–200 extra calories) can lead to noticeable weight gain over months.
Most people think weight gain requires binge eating—but this shows tiny, daily imbalances from processed foods add up silently.
Practical Takeaways
Swap one ultra-processed snack per day for a whole food—e.g., replace chips with nuts or yogurt with fruit.
Publication
Journal
Nature Reviews Endocrinology
Year
2025
Authors
Filippa Juul, E. Martínez-Steele, N. Parekh, C. Monteiro
Related Content
Claims (5)
People who eat a lot of highly processed foods like chips, sugary snacks, and frozen meals tend to eat more calories and gain more weight than those who eat whole foods, even when they’re not trying to.
Eating a lot of processed foods may change the good bacteria in your gut in ways that make it harder for your body to manage weight and blood sugar.
Processed foods often contain artificial sweeteners, chemicals to make them smooth, and toxins from packaging, which might interfere with how your body regulates hunger and fat storage.
Foods like cookies, chips, and sugary cereals are designed to be eaten quickly and taste super good, so people eat more before feeling full than they do with whole foods like fruits or beans.
As countries have shifted from eating whole foods to eating packaged, processed foods, their rates of obesity have gone up at the same time — a pattern seen around the world.