@MMAN
I’ve been on an AI for over nine years. I had one bout of hair thinning (very limited) early on and the likely culprit was that my ‘normal’ shedding pattern had changed after my hair grew back. As every other aspect of my hair changed too (at least at the beginning), this seems reasonable! I have had no problems since. I didn’t gain weight. Sometimes it’s easy (comforting) to assume treatment is the cause, and sometimes it is, but not always. I’d been used to washing my hair almost daily, brushing when wet, blow drying, generally being pretty rough. Any hairdresser will tell you that’s not the best! I learned to take a little more care and now it’s normal to do so. Reactions to treatments vary immensely so best to start with as positive an attitude as possible. Remember, you can always stop. Best wishes.