Eating early makes your body release more of the fullness hormone in the evening, helping you feel satisfied after dinner.
Scientific Claim
Early time-restricted feeding increases evening levels of peptide YY (PYY) by 17 ± 6 pg/mL in overweight adults, a hormone associated with satiety, without affecting morning PYY levels.
Original Statement
“In the evening, eTRF tended to decrease active ghrelin (Δ=−22±12 pg/ml; p=0.09) and increased PYY (Δ=17±6 pg/ml; p=0.02) but did not affect leptin (p=0.18) or GLP-1 (p=0.36).”
Evidence Quality Assessment
Claim Status
appropriately stated
Study Design Support
Design supports claim
Appropriate Language Strength
definitive
Can make definitive causal claims
Assessment Explanation
The RCT design with direct hormone measurement supports definitive causal language. The effect is specific to evening PYY and statistically significant.
Evidence from Studies
Supporting (0)
Contradicting (1)
Early Time-Restricted Feeding Reduces Appetite and Increases Fat Oxidation but Does Not Affect Energy Expenditure in Humans
This study looked at how eating earlier affects hunger and fat burning, but it never measured the hormone PYY, so we can't say whether it goes up in the evening like the claim says.