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Dietary fiber refers to indigestible carbohydrates from plant foods. It supports digestion, stabilizes blood sugar, lowers cholesterol, and feeds beneficial gut bacteria. The effects are well-documented: soluble fiber (e.g., oats, legumes) forms a gel that binds bile acids, while insoluble fiber (e.g., whole grains, nuts) speeds intestinal transit. Benefits include reduced risk of cardiovascular disease, type 2 diabetes, and colorectal cancer. Tips: increase intake gradually, drink plenty of water, aim for variety and about 30 g per day. Caveat: sudden high intake can cause bloating; isolated fiber supplements are not a substitute for whole foods. The provided context lacks specific fiber studies – this answer relies on general medical consensus. Evidence: practice (established dietary guidelines).