Does eating fiber by itself reduce mortality?
Or do healthy and wealthy people with active lifestyles and excellent healthcare happen to also eat more fiber?
Or do healthy and wealthy people with active lifestyles and excellent healthcare happen to also eat more fiber?
Part of the reason we expect fiber to reduce mortality, rather than simply being a marker of other factors correlated with mortality, is that we can identify physiological mechanisms. For example, for cardiovascular mortality, fiber reduces LDL cholesterol / ApoB which lowers heart attack and stroke risk.