Dietary fiber and health outcomes: real benefits, overhyped claims, and practical applications | Peter Attia, M.D. This trailer is from “Ask Me Anything” episode # 77 (Ep. # 372) of The Drive which was released today (11/10/25). In the full episode, we cover: -The true effect sizes for fiber on weight loss, glycemic control, and LDL cholesterol, and how these compare to other interventions. -Whether processed forms of fiber, including fiber supplements, produce the same physiological effects as