I recently stumbled upon fitness tik tok, and the sheer number of people admitting to engorging themselves one week then absolutely starving themselves another is really wild. Supposedly the goal is to get "cut", but it really feels like what wrestlers used to do in my high school lol
I tend to cut over long periods. My diet is already pretty strict because my body can't handle certain foods. It's less about vanity for me and more just a fun routine that I do. The people who cut over ridiculously short periods of time do have eating disorders in my opinion and they only really work out for vanity reasons.