> being young and having an insane metabolism curious, how young do you mean? Human metabolism doesn't really change during adulthood until old age: > Fat-fre

> being young and having an insane metabolism curious, how young do you mean? Human metabolism doesn't really change during adulthood until old age: > Fat-free mass–adjusted expenditure [...] remains stable in adulthood (20 to 60 years), even during pregnancy; then declines in older adults. https://www.science.org/doi/10.1126/science.abe5017 https://www.science.org/doi/10.1126/science.abe5017