Sigma Nutrition Radio

Timing of Eating: Energetic Hypothesis (SNP32)

Aug 27, 2024
The fascinating concept of chrononutrition reveals how the timing of meals influences weight management. Evidence suggests eating more in the morning may boost weight loss, independent of calorie intake. The thermic effect of feeding plays a crucial role, with key studies demonstrating variations in energy expenditure based on when we eat. Dr. Flanagan delves into these mechanisms, exploring the energetic hypothesis and how adjusting meal times may transform our dietary planning and understanding of obesity.
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INSIGHT

Components of Energy Expenditure

  • Total daily energy expenditure has three components: resting metabolic rate, physical activity thermogenesis, and the thermic effect of feeding (TEF).
  • Resting metabolic rate is the largest (60-70%), TEF the smallest (10%), and physical activity is the most variable component.
INSIGHT

Thermic Effect of Feeding Detailed

  • The thermic effect of feeding varies with diet composition, highest with protein and lowest with fat.
  • TEF normally accounts for 5 to 10% of total energy expenditure, depending on macronutrient makeup.
INSIGHT

Diurnal Variation in TEF

  • The thermic effect of feeding shows diurnal variation, being highest in the morning and lowest late at night.
  • A 1993 study showed TEF was 15.9% at 9am vs 10.9% at 1am for the same meal.
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