It’s a lot of things. It’s a diet so strict and regimented it controls your life, same for exercise, and then they dehydrate for days. Is the water why random person on Lemmy doesn’t look like that? No, that’s because nobody looks like that unless it’s their job to look like that or it’s their only hobby or they have serious mental health issues pushing them that way. But it is dangerous for most people to even try because yeah it involves a lot of risky decisions and they don’t even look like that all the time