By Dr. Priyom Bose, Ph.D. Reviewed by Lauren Hardaker Jul 9 2025 Just a few more grams of daily fiber could help millions of Americans prevent obesity and live longer. But how much do you need for maximum protection? Study:  Association between dietary fiber intake and obesity in US adults: from NHANES 1999–2018 . Image credit: marilyn barbone/Shutterstock.com A recent study in Frontiers in Nutrition investigated the effects of dietary fiber intake on American adults with obesity and found that