Hmm I wonder if your body can't process fructose? When you talk about fruit do you mean sweet fruit like apples, pineapple, grapes, watermelon, etc.? If this is so, there could be a possibility that your body cannot breakdown fructose and maybe that is what is causing you to smell? Remember, I am in no way, shape, or form a doctor. But, it's funny to me that foods like apples and peppers can give you an odor when they're both considered high in fructose. If you do find some correlation between sweet fruit and Body Odor then maybe you should avoid foods that have fructose. Here's a list I found on the web that have a nutrition guide for fructose malabsorption http://www.healthhype.com/nutrition-guide-for-fructose-malabsorption.html
Now I got to ask you is there a relationship between sweet fruit and Body Odor to you?