Peter Attia's body fat increased from ~7% to 16% and he lost muscle mass over a decade, while his body weight remained unchanged.

“my lowest weight captured on a dexa was on um was in October of 2012 and that was 167.5 pounds Now by that point my lean mass was down to about 145 pounds so that's um you know like 11 pounds less than uh that initial test in April pardon me in May of 2011. um my body fat percent was like what nine and a half percent and my almi oh sorry we're still not calculating that but my ffmi is still about 22.”