Effect of macronutrient composition on postprandial peptide YY levels

Area of Science:

• Endocrinology
• Nutritional Science
• Obesity Research

Background:

• Peptide YY (PYY) is a gut hormone released post-meal, promoting satiety and appetite reduction.
• PYY release is generally proportional to caloric intake, with fat ingestion also known to stimulate PYY secretion.

Purpose of the Study:

• To investigate the impact of dietary macronutrient composition on postprandial serum PYY levels.
• To compare the effects of a weight-maintenance low-carbohydrate, high-fat (LCHF) diet versus a low-fat, high-carbohydrate (LFHC) diet on PYY secretion.

Main Methods:

• A randomized crossover study involving 18 obese subjects.
• Participants consumed either an LCHF or LFHC diet for one week, followed by a standardized test meal and PYY level assessment.
• A one-week washout period preceded crossover to the alternative diet.

Main Results:

• The LCHF diet resulted in a 1.5-fold greater postprandial area under the curve for PYY compared to the LFHC diet (P < 0.001).
• Postprandial serum PYY levels were 55% higher following the LCHF diet compared to the LFHC diet (P = 0.005).

Conclusions:

• A low-carbohydrate, high-fat diet significantly stimulates PYY secretion in obese individuals compared to a low-fat, high-carbohydrate diet.
• These findings suggest that LCHF diets may have a greater impact on satiety signaling.