Banana - A fruit too sweet to eat? Or fruit from sugar hell?

Why am I asking this?  Because some moronic trainer told an associate I work with to eliminate bananas from her diet because they contained too much sugar.  Have you ever heard anything so stupid, giving up nutrition to cut down sugar intake?  I'd like someone to name me just one fruit that doesn't contain sugar.  Just think, this trainer is being paid because she claims to be an authority.  If anything, people should pay her to keep her mouth shut.