Re: increased breast size, irregular period, maca root?
Protein in the diet is unlikely to target just one area. Did you gain weight elsewhere also? I am a protein eater and lately my breasts have gotten smaller. Most of my life I seem to have had a hormonal imbalance which caused my breasts to grow....I think it was estrogen dominance because when taking estradial,birth control pills, or any herbal hormone supplement just made it worse. For the past month I have been taking samento and they haven't gotten bigger before my period. Usually it would prevent me from jogging for a week.
I tried diets to see if that was what was affecting my hormones...and it didn't make any difference whatsoever.
Excercise definitely can affect the cycle of a period. Ususally intense excersise can stop a period if not enough calories are being taken in. Stress is probably the most likely to affect a cycle. And, of course, anything that targets hormones. The hemp also affects hormones because of the GLA content. I took evening primrose oil and it didn't do me any favors. Maybe take a protein that is not hormone based? Like lecithin with aminos...something like that. The whey is probably ok...I haven't tried it myself.
If you like the increased breast size, (it is not painful of anything), but you are not too keen on the irregular period, why not try a different herbal hormone supplement. Most of them are estrogen increasers, and so you may keep the breast size, and maybe you will have better luck with the irregular cycles.