Metabolism (basal metabolic rate) does not drop drastically in midlife as is often believed; it actually remains remarkably stable between the ages of 20 and 60.

noli's read

The creator relies on robust data from a major study published in the journal Science (Pontzer et al., 2021), which analyzed the energy expenditure of more than 6,400 people. This research, using the doubly labeled water method (the gold standard in the field), demonstrates that once adjusted for lean body mass, basal metabolism does not decline significantly until about age 60. The popular idea of a metabolic 'collapse' at 30 or 40 is therefore largely exaggerated. The feeling of slowing down experienced by many is more related to the gradual loss of muscle mass and a decrease in physical activity than to a radical internal physiological change. This advice is therefore scientifically grounded and useful for deconstructing a persistent myth.

the sources

No named source held this one up — that absence is part of the verdict.