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Plasma GIP levels exhibit diurnal variation, peaking after meals and remaining elevated throughout the day.
Plasma gastric inhibitory polypeptide (GIP) was studied for 24 h in six healthy, young men who ate four meals and performed their usual physical activities. Plasma GIP peaked after each meal and stayed significantly elevated from the peak after breakfast till late evening.
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Jorde et al. (1980) studied this question.
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