Reduced-fat peanut butter cuts fat to 34 g per 100 g. Total calories stay 520 kcal — the "reduced fat" label does not mean "lower calorie." Makers often swap in sugar or maltodextrin to match texture. An NIH inpatient RCT (Hall et al., Cell Metab 2019) found ultra-processed diets drive +508 kcal/day overconsumption at matched macros.
How should I track Peanut butter, smooth, reduced fat?
Peanut butter, smooth, reduced fat is high in magnesium. Nuts like Peanut butter, smooth, reduced fat are one of the easiest foods to overeat. Research on portion estimation (Almiron-Roig et al., Appetite 2013) found that people underestimate calorie-dense foods by 50–200% when eyeballing portions. A small handful can easily be 300+ calories. The best habit: pre-portion into 30 g bags or use a scale each time. Also check whether your nuts are raw, roasted, or roasted-in-oil — the roasted-in-oil versions add extra fat that is not in the raw nutrition values.