Crash diet, lost hair (photo)

No real history of MPB in family other than normal hair loss after ~50 years old. I am 23 and was fat all of my childhood. I lost about 70-80 lbs in under a year and a half about 2-3 years ago. I basically lost it in the worst way possible… starving, keto, etc. Barely functioned during that time. Since then my hair seemed noticeably thinner on the entire hairline and crown a bit. However, it seemed to get bad and then stay the same since then. Hasn’t really gotten worse. I read that weight loss can trigger MPB somehow. Does this mean I’m basically starting now what I would start at 45/50 years old? Does it necessarily mean it’s going to keep getting worse? Or is there a chance it’ll take some time? I’d really rather get a hair transplant than take drugs daily.

Significant weight loss causes hair loss. 30 pounds in a month is very extreme. A safe number is 1 pound/week and should reflect a new lifestyle of eating, not crash dieting. Even though your family history doesn’t show balding, you have developed a Norwood Class 3 Vertex pattern of balding which was mot likely accelerated by your crash diet.