LogFAQs > #979977174

Guide posted...

I can't believe that. I'm taking my health more seriously than ever, but the calories no longer disappear into what was formerly a nuclear reactor of a metabolism.

https://tinyurl.com/22y65vv9
The data suggest that our metabolisms dont really start to decline again until after age 60. The slowdown is gradual, only 0.7% a year. But a person in their 90s needs 26% fewer calories each day than someone in midlife.

https://www.health.harvard.edu/blog/surprising-findings-about-metabolism-and-age-202110082613
Adulthood (20 to 60 years): Total and basal expenditure and fat-free mass were all stable from ages 20 to 60, regardless of sex. Adjusted TEE and RMR remained stable even during pregnancy, and any increase in unadjusted energy expenditure during pregnancy was accounted for by the increase in body mass. The point at which adjusted TEE started to decline was age 63, and for adjusted BMR was age 46.5 (although the researchers indicate a small number of BMR measurements reduced their confidence in this estimate).

https://www.science.org/doi/10.1126/science.abe5017

There's a lot of reasons why you find it harder to lose weight now that you're older (aside from the other things I mentioned, maybe you just have more fat cells now), but it's almost certainly not because your basal metabolic rate has significantly changed.