Contemporary research indicates that merely counting calories is not always sufficient for weight loss. According to scientists, the outcome depends not only on the food’s energy content but also on its composition, level of processing, cooking method, and individual body characteristics.
The calorie count listed on packaging does not always match the energy the body actually absorbs. This is influenced by cooking techniques, digestive processes, genetics, the ripeness of certain fruits, and rounding rules on labels, which can cause actual calorie values to differ by about 20%.
Experts note that foods with the same energy value can affect satiety and metabolism differently. Items with a high glycemic index rapidly raise blood glucose levels, leading to a quicker return of hunger. In contrast, whole grains, legumes, nuts, and seeds, thanks to their fiber and resistant starch, digest more slowly, and some of their energy may not be absorbed by the body.
Calorie absorption is also affected by cooking methods and the degree of food processing. Moreover, studies show that a diet rich in ultra-processed foods may reduce resting energy expenditure. According to researchers, the same food can impact individuals differently due to genetics, gut microbiota composition, physical activity levels, hormonal status, sleep quality, and overall health.
Experts believe that calorie counting remains a useful tool for dietary control, but they recommend also focusing on diet quality. They suggest regularly choosing whole foods, consuming more vegetables, fruits, legumes, and whole grains, while limiting sugar, refined carbohydrates, and ultra-processed products.
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