Peanut butter is relatively low in saturated fat. While it does have a significant amount of fat per serving there tends to be a lower percent daily amount of the saturated when compared to the total fat. That said - it's also important to look at the oils in the peanut butter. For example, when I just looked up Skippy PB - the natural is made with palm oil which is natural but generally higher in saturated fat (which causes an increase in bad cholesterol) but the regular Skippy used hydrogenated fats from other vegetable oils which are lower in saturated fat.
So, my best suggestion is read your labels. All brands are going to be a bit different.
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