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Increase in the thermic effect of food in women by adrenergic amines extracted from citrus aurantium. | LitMetric

AI Article Synopsis

  • - The study aimed to compare the thermic response to meals between men and women with different body compositions and to see if citrus aurantium (CA) increases metabolic rate and the thermic effect of food (TEF).
  • - Results showed that women had a significantly lower TEF than men, but when CA was added to meals, the increase in TEF was notable in women, making their response similar to men's.
  • - The findings suggest that women may have a weaker sympathetic nervous system response to meals, but the short-term boost from CA might not lead to significant long-term weight loss.

Article Abstract

Objective: To compare the thermic response to a meal between men and women of varied body composition and to determine whether adrenergic amines extracted from citrus aurantium (CA) induce an increase in metabolic rate and enhance the thermic response to the meal.

Research Methods And Procedures: In 30 healthy weight-stable subjects (17 women, 13 men; BMI: 20 to 42 kg/m2), body composition was determined by bioimpedance analysis followed by resting energy expenditure for 20 minutes, and the thermic effect of food (TEF) of a 1.7-MJ, 30-gram protein meal was determined intermittently for 300 minutes by indirect calorimetry. In a subset of 22 subjects, the TEFs of CA alone and when added to the same 1.7-MJ meal were determined. Blood pressure and pulse before and throughout the studies and catecholamine excretion were determined.

Results: TEF was significantly lower in women than men (152 +/- 7 vs. 190 +/- 12 kJ and 8.8 +/- 0.4% vs. 11.0 +/- 0.7% of meal), independently of age and magnitude of adiposity. The thermic response to CA alone was higher in men, but, when added to the meal, CA increased TEF only in women and to values no longer different from men. CA had no effect on blood pressure and pulse rate but increased epinephrine excretion by 2.4-fold.

Discussion: A 20% lower TEF in women suggests a diminished sympathetic nervous system response to meals, because with CA, TEF increased by 29% only in women. However, this acute response may not translate into a chronic effect or a clinically significant weight loss over time.

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Source
http://dx.doi.org/10.1038/oby.2005.141DOI Listing

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