No they didn’t, lol. If you lose 10 kg of MUSCLE mass in a month, you’re seriously sick, like starving sick.
And there’s no “natural skinny as a rail”, you either eat and workout enough, or you don’t.
> And there’s no “natural skinny as a rail”, you either eat and workout enough, or you don’t.
Just as some people are short and others tall people produce different amounts and proportions of hormones which leads them to put on muscle easily or not.
For the most extreme ethnic examples of this consider the Kalenjin of East Africa who are skinny and wildly over represented as marathon runners and Polynesians who are wildly over represented as rugby players and in US Football, who are more muscular.
