Honestly, if you are trying to lose weight you shouldn't be eating peanut butter. And the reduced fat peanut butter really isn't any better than regular peanut butter because they usually contain the same calories. For example, I looked up JIF reduced fat peanut butter and it had 190 calories in a serving, the same as the original creamy brand. All brands of regular peanut butter contain hydrogenated oils, which are simply bad for you. Natural peanut butter simply contains peanuts and salt without all the other fillers.

Its all about the calories in the end if you are trying to lose weight.