There was a recent study that found that total energy expenditure has decreased since the 1990s due to a reduction in the basal metabolic rate. A 7.7% reduction

There was a recent study that found that total energy expenditure has decreased since the 1990s due to a reduction in the basal metabolic rate. A 7.7% reduction (220 kcal) of the total energy expenditure for males might not seem like a lot, but it is. If you weighed 75 kg you would need about 2100 kcal to maintain your weight. If you started eating 2320 kcal instead then eventually you would weight about 93 kg. Source: https://pubmed.ncbi.nlm.nih.gov/37100994/ https://pubmed.ncbi.nlm.nih.gov/37100994/