Caffeine's affect on estrogen in AFAB people.
I thought this is an interesting read/possibly helpful info for white FTM who can't be on testosterone/hormone blockers rn. The intake of 200mg/+ showed a reduction of estrogen levels in white females (though an increase in black+asian females).
https://pmc.ncbi.nlm.nih.gov/articles/PMC2579678/
This study further showed that 3+ cups of coffee a day was associated with smaller chest sizes (though dependant on if you have the gene or not).
Of course this isn't to be taken as medical advice and you should look into this more yourself if you're thinking about drinking a ton of coffee everyday, just something I thought yall'd be interested in.