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Metabolism & Digestion Hormones

Peptide YY (PYY)

This hormone acts to put the breaks on your appetite. As food fills your stomach, the small intestine produces PYY to tell your brain that you’re full. Levels rise and fall based on your food consumption, which means that it generally hits its lowest levels during sleep. Studies have shown that PYY has antimicrobial properties, which may contribute to the skin's defense mechanisms against invading microorganisms.