i think its what you eat. If you eat a lot of carbs, you're bound to feed more bacteria. If you undereat, your body odor is low. But I think what they were refering to was a certain chemical found in sweat, (also in the saliva and urine). Some guys smell spicy to me, and sometimes I can smell that underneath any other smell they might be emitting. Except if they-ve beeen working on some sort of machinery with refined petroleum.