Interestingly, peanut butter is near the bottom of the scale for being insulinogenic (the food insulin index). That means it's less likely to be put away as fat according to The Personalized Diet by Drs Segal and Elinav [1]
Switch to unsweetened, unsalted peanut butter. It's amazing - after 2 weeks I stopped noticing the difference. The amount of sugar in most peanut butter is absurd.
Once you kick the sugar taste, oh wow do you realize its got a much more interesting and involved flavor.
It probably does. Colloquially when one says peanut butter, people think of Jiff, which can be best described as a disgusting peanut-flavored spread product. Go with natural peanut butter (i.e. where the only ingredient is peanuts and it must be stirred) and you're all good.
[1] https://www.amazon.com/dp/1478918802