How do high-calorie foods and sugary drinks contribute to obesity?

High-calorie foods and sugary drinks contribute to obesity primarily by promoting overeating and facilitating the storage of excess energy as fat.12

In affluent societies, the widespread availability of inexpensive, processed, high-calorie foods—often rich in sweeteners and saturated fats—makes it easy to exceed daily caloric needs, especially when paired with sedentary lifestyles. Sugary drinks, including those sweetened with high-fructose corn syrup, are particularly significant because they can contain high amounts of sugar per serving, often exceeding recommended daily intake limits.132

When the body consumes more sugar than it requires for immediate energy, metabolic enzymes in the liver convert the excess into fat. This accumulation of fat contributes to weight gain and increases the risk of metabolic syndrome, type 2 diabetes, and cardiovascular disease. Furthermore, because these foods are often ultra-processed, they lack the nutritional balance required to regulate hunger effectively, leading to a cycle of overconsumption that drives the development of obesity.23145