Hey Hulkette! First, welcome!
Yep -- what you are hearing may seem counter intuitive. Yes fruits are good in the sense that they provide many good vitamins and enzymes that your body needs, but if you look at fruits from the standpoint of the food basics (proteins, fats, carbs), fruits are a major source of simple carbs, aka sugar. In the form of fructose, its still sugar. You might check out
www.about.com and look under "Glycemic Index" - this explains how simple or complex carbs affect your insulin levels and how that impacts how your body stores fat or uses carbs for energy.
As far as natural peanut butter & good quality fats -- the media has gotten us so paranoid about "fat" thast we are scared to death of it, and then end up fill in our food intake w/ carbs. Essentially Fatty Acids are needed and are a good thing. Natural peanut butter is a decent source for fats, in addition to nuts, fish, lean red meat, and of course flax oil. Regular (non natural) PB is loaded with all sorts of junk, so you are better off sticking w/ the natural stuff, but also dont' get too hooked on it because its heavy in carbs & calories too!
You should also spend some time cruising around the diet boad or just doing searches when you find things that arent' quite intuitive like the above., Or just ask! We've all had the same questions!
You'll love this place!