Resting metabolic rate and postprandial thermogenesis in vegetarians and nonvegetarians.


Thermogenesis: Production of body heat during metabolism. TC Campbell describes the author's conclusions as badly misinterpreted.

TitleResting metabolic rate and postprandial thermogenesis in vegetarians and nonvegetarians.
Publication TypeJournal Article
Year of Publication1988
AuthorsPoehlman ET, Arciero PJ, Melby CL, Badylak SF
JournalThe American journal of clinical nutrition
Date Published1988 Aug
KeywordsAdolescent, Adult, Basal Metabolism, Body Temperature Regulation, Calorimetry, Indirect, Diet, Vegetarian, Energy Metabolism, Food, Humans, Insulin, Male, Physical Fitness, Thyroxine, Triiodothyronine

Resting metabolic rate (RMR), thermic effect of a meal (TEM), and associated hormonal changes were studied in vegetarians and nonvegetarians. RMR was established by indirect calorimetry in 12 male vegetarians (VEG) and 11 nonvegetarians (NVEG) of similar body fat and aerobic fitness. Subjects ingested a liquid meal and TEM was measured for 180 min postprandially. Plasma concentrations of glucose, insulin and thyroid hormones (T3 and T4) were determined before and after meal ingestion. Absolute RMR was comparable between VEG and NVEG. However, TEM was lower (p less than 0.01) in VEG (55.8 +/- 3.3 kcal/180 min) vs NVEG (76.4 +/- 3.6). Plasma levels of glucose and insulin were similar between the two groups whereas plasma T3 was slightly but nonsignificantly lower in vegetarians. A vegetarian diet may decrease the postprandial thermic response; this does not support the supposition that an elevated TEM is a factor contributing to the lower body weight in vegetarians than in omnivores.

Alternate JournalAm. J. Clin. Nutr.
PubMed ID3044062
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