A new study published in the journal Proceedings of the National Academy of Sciences suggests that a high-calorie diet is more likely to cause obesity than a lack of exercise. The research analyzed data from over 4,200 adults across six continents and found that consuming ultra-processed foods like processed meats and snack cakes was strongly linked to increased body fat percentage.
The study’s authors note that while regular exercise is still essential for preventing disease and maintaining good mental health, it appears to be less of a factor in obesity. Instead, the researchers point to the high energy density and nutrient composition of ultra-processed foods as contributing factors to weight gain.
According to the study, total energy expenditure (TEE) was found to be higher in more economically developed countries, but after adjusting for age, sex, and body size, physical activity levels were still not a significant contributor to obesity. The researchers suggest that these foods “disrupt satiety signaling and encourage overconsumption,” leading to increased calorie absorption.
The study’s findings have implications for addressing the global obesity crisis. While regular exercise remains important, reducing calories from highly processed foods is crucial. The authors emphasize the need for further research into what makes certain foods contribute to obesity.
Source: https://medicalxpress.com/news/2025-07-obesity-high-calorie-diet-lack.html