Researchers measure the impact of postprandial somnolence, or "food coma" on the test-taking abilities of adolescents and young adults in India.
Authors: Justine Hervé, Subha Mani, Jere Behrman, Ramanan Laxminarayan, and Arindam Nandi
Food coma, also known as postprandial somnolence, is a commonly cited reason for experiencing reduced alertness during mid-afternoon worldwide. By using exogenous variation in the timing of tests and, hence, by extension, plausibly exogenous variation in the temporal distance between an individual’s last meal and the time of test, we examine the causal impact of postprandial somnolence on cognitive capacities. Analyzing novel time use data on ∼ 4,600 Indian adolescents and young adults, we find that testing within an hour after a meal reduces test-takers’ scores on English, native language, math, and Raven’s tests by 8, 8, 8, and 16 percent, respectively, compared to test-takers who took the tests more than an hour after their meal. We further find that the negative effect of postprandial somnolence on cognition operates through increased feelings of fatigue and depletion of cognitive resources.
Citation:
Hervé, Justine, Subha Mani, Jere Behrman, Ramanan Laxminarayan, and Arindam Nandi. 2024. “Food Coma is Real: The Effect of Digestive Fatigue on Adolescents’ Cognitive Performance.” University of Pennsylvania Center Working Paper (PSC/PARC).