Appetite responds to changes in meal content, whereas ghrelin, leptin, and insulin track changes in energy availability

What Was Tested

The paper reports a study of Ghrelin, published as a randomized controlled trial.

The aim of the study was to examine the influence on human appetite of the meal size and its nutrient content or changes in energy availability and concentrations of ghrelin, leptin, and insulin.

Why It Was Studied

It is uncertain how between-meal variations in energy availability and physiological changes in ghrelin, leptin, and insulin affect appetite.

Who Took Part

PubMed indexes the participants as middle-aged adults, women only.

The researchers conducted a crossover study manipulating meal size and energy availability through exercise energy expenditure and iv nutrient replacement (TPN).

The researchers conducted trials based on different morning meal size (418 vs. 2090 KJ), presence or absence of exercise energy expenditure (2273 to 2361 KJ), energy replacement by TPN (1521 to 1538 KJ), and a midday ad libitum meal.

How the Study Was Run

In design terms this was a randomized and crossover study.

The participants were allocated by chance, so the Ghrelin group and the comparison group should start out alike.

Each person switched between Ghrelin and the comparison at some point, usually with a gap in between.

The study was performed at a Clinical Research Center.

What Was Measured

Topics PubMed links to this paper include Appetite, Blood Glucose, Diet, Energy Metabolism, Exercise, Exercise Test and Food.

What This Means in Plain Language

The paper is a randomized and crossover study of Ghrelin.

Its findings take up roughly 7 sentences of the abstract and are left out here on purpose; the source paper is the place to read them.

The publication is from 2009 (The Journal of clinical endocrinology and metabolism), a journal based in United States.

More context: the Ghrelin compound page, all human trials.