Answer: A. 3%. According to a recent long-term observational study of >144 000 US health professionals published in BMJ Nutrition, Prevention & Health, increasing total nut consumption by 0.5 servings/day was associated with a 3% lower risk of becoming obese (95% CI, 0.96-0.99, P=0.004).
2. According to the same study, adults who increased their daily consumption of peanuts specifically by 0.5 servings/day had the lowest risk of developing obesity.