Energy balance
Obese subjects exhibit a significantly reduced thermic effect of glucose (approx. 5.2% increase in metabolic rate) compared to lean controls (approx. 13.0% increase) following a 50g glucose load, suggesting inefficient dietary-induced thermogenesis contributes to low energy expenditure in obesity.
This research suggests that obese individuals may burn fewer calories from food (specifically glucose) than lean individuals due to a blunted thermic effect. This isn't about willpower; it's a physiological difference in how energy is expended. Understanding this metabolic inefficiency can help shift the focus from just 'eating less' to strategies that might address metabolic rate and energy expenditure.
In the control group, this increase was 13.0 % of the initial (fasting) value, whereas in the obese group it was only 5.2 %, i.e. about half the thermic effect found in the control group. This difference in metabolic rate stimulation was highly significant
Why this rating
Direct calorimetry is the gold standard for measuring heat production; the study uses this rigorous method, though the sample size is small (n=21).
Source
Thermic effect of glucose in obese subjects studied by direct and indirect calorimetry
P Pittet et al. · British Journal Of Nutrition · 1976
DOI 10.1079/bjn19760033
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