A Preprandial Rise in Plasma Ghrelin Levels Suggests a Role in Meal Initiation in Humans
Cummings and colleagues tracked the hormone ghrelin in ten healthy people fed on a fixed schedule, sampling their blood thirty-eight times across a full day. The pattern is the finding. Ghrelin rose to roughly double its baseline immediately before each meal and dropped to its lowest point within an hour of eating, the mirror image of insulin. That timing is what makes it the strongest human evidence that ghrelin is involved in starting a meal rather than merely reflecting an empty stomach, since the rise precedes the food. Between meals, levels followed a daily rhythm in phase with leptin, climbing through the day to a peak in the early hours and falling to a low in the morning. Two practical observations follow: single measurements taken around breakfast predicted the whole day's levels well enough to serve as a shortcut, and ghrelin levels rose with age. The sample is small, as metabolic studies of this intensity usually are.
Cummings and colleagues tracked the hormone ghrelin in ten healthy people fed on a fixed schedule, sampling their blood thirty-eight times across a full day. The pattern is the finding. Ghrelin rose to roughly double its baseline immediately before each meal and dropped to its lowest point within an hour of eating, the mirror image of insulin. That timing is what makes it the strongest human evidence that ghrelin is involved in starting a meal rather than merely reflecting an empty stomach, since the rise precedes the food. Between meals, levels followed a daily rhythm in phase with leptin, climbing through the day to a peak in the early hours and falling to a low in the morning. Two practical observations follow: single measurements taken around breakfast predicted the whole day's levels well enough to serve as a shortcut, and ghrelin levels rose with age. The sample is small, as metabolic studies of this intensity usually are.
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Cummings, D. E., Purnell, J. Q., Frayo, R. S., Schleicher, K., Breen, P. A. & Weigle, D. S. (2001). "A preprandial rise in plasma ghrelin levels suggests a role in meal initiation in humans." Diabetes, 50(8), 1714-1719. Ten participants on fixed meal schedules; ghrelin roughly doubled before each meal and fell within an hour of eating.
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- Why You Are Hungry an Hour After a Big Lunch, Why We Crave
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The source
https://doi.org/10.2337/diabetes.50.8.1714
DOI: 10.2337/diabetes.50.8.1714