[logicchains]

I'm not saying metabolism doesn't vary among individuals, I'm saying for a given individual, their overall metabolism could decrease as they age due to having less muscle mass even if their rate per kg muscle didn't change.

[adrian_b]

What you say is true, but the main point of the paper is that they have measured a decrease of the metabolism after around 62 years even after correcting for the body composition, so the less muscle mass explains only a part of the decrease of the metabolism for older people.

The rest is likely to be due to slower rates of protein synthesis for the renewal of various body parts.

[m3kw9]

Yeah I agree muscle is a big factor, given you use it too