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PYY acts to reduce appetite; similarly, when injected directly into the central nervous system, PYY is also anorexigenic, i.e., it reduces appetite.
Dietary fibers from fruits, vegetables, and whole grains, consumed, increase the speed of transit of intestinal chyme into the ileum, to raise PYY 3-36, and induce satiety
Wikipedia
PYY inhibits food absorption, intestinal movement, pancreatic and intestinal secretion, and gastrointestinal emptying