Things that are good for hair loss

My younger sibling's hair is thinning a bit, probably because they've been under a lot of stress lately due to job hunting.

It seems like if I continue like this, I might develop alopecia areata...

So, instead of medication, what are good foods for hair loss?

Is there any exercise or activity to prevent hair loss?

I think there is a certain limit to medication after all.

If nothing else works, do I have to get a hair transplant? T_T