well... I know they say it has to do with diet, but you say your diet hasn't changed. I think it's also a metabolic thing. I know when I was in undergrad, I was much stinkier than I am now - could have been the lousy hippie deoderant I was using. I think some hippie types suggest a 'cleansing' diet. I know that various medical problems manifest as an odd bodily odor. Maybe it just has to do with some hormonal change? Not much help, huh? Good luck!