Yes, foods high in fiber reliably reduce hunger by promoting satiety and slowing digestion.
How Fiber Works
Soluble fibers (e.g., beta-glucan in oats, psyllium) form a gel in the gut, delaying stomach emptying and nutrient absorption, which sustains fullness hormones like PYY and GLP-1.
Insoluble fibers (e.g., in veggies, whole grains) add bulk, requiring more chewing and stretching the stomach for immediate satiation while speeding transit to prevent overeating.
Systematic reviews confirm 39% of high-fiber interventions cut appetite ratings, with rye bran, beta-glucan, and legumes showing strongest effects on energy intake.
Practical Impact
High-fiber meals (30g+) lower calorie intake at next meals by 10-20% in trials, aiding weight control without deprivation.
Effects peak with viscous/fermentable types; sudden jumps cause bloating, so ramp up gradually with water.
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