The Consistency in Macronutrient Oxidation and the Role for Epinephrine in the Response to Fasting and Overfeeding.
J Clin Endocrinol Metab
; 102(1): 279-289, 2017 01 01.
Article
en En
| MEDLINE
| ID: mdl-27820654
ABSTRACT
Context In humans, dietary vs intraindividual determinants of macronutrient oxidation preference and the role of the sympathetic nervous system (SNS) during short-term overfeeding and fasting are unclear. Objective:
To understand the influence on metabolic changes of diet and SNS during 24 hours of overfeeding. Design, Setting, Participants, andInterventions:
While residing on a clinical research unit, 64 participants with normal glucose regulation were assessed during energy balance, fasting, and four 24-hour overfeeding diets, given in random order. The overfeeding diets contained 200% of energy requirements and varied macronutrient proportions (1) standard (50% carbohydrate, 20% protein, and 30% fat); (2) 75% carbohydrate; (3) 60% fat; and (4) 3% protein. Main OutcomeMeasures:
Twenty-four-hour energy expenditure (EE) and macronutrient oxidation rates were measured in an indirect calorimeter during the dietary interventions, with concomitant measurement of urinary catecholamines and free cortisol.Results:
EE decreased with fasting (-7.7% ± 4.8%; P < 0.0001) and increased with overfeeding. The smallest increase occurred during consumption of the diet with 3% protein (2.7% ± 4.5%; P = 0.001) and the greatest during the diet with 75% carbohydrate (13.8 ± 5.7%; P < 0.0001). Approximately 60% of macronutrient oxidation was determined by diet and 20% by intrinsic factors (P < 0.0001). Only urinary epinephrine differed between fasting and overfeeding diets (Δ = 2.25 ± 2.9 µg/24h; P < 0.0001). During fasting, higher urinary epinephrine concentrations correlated with smaller reductions in EE (ρ = 0.34; P = 0.01).Conclusions:
Independent from dietary macronutrient proportions, there is a strong individual contribution to fuel preference that remains consistent across diets. Higher urinary epinephrine levels may reflect the importance of epinephrine in maintaining EE during fasting.
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Carbohidratos de la Dieta
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Grasas de la Dieta
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Proteínas en la Dieta
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Epinefrina
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Ayuno
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Hipernutrición
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Metabolismo Energético
Tipo de estudio:
Observational_studies
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Prognostic_studies
Idioma:
En
Revista:
J Clin Endocrinol Metab
Año:
2017
Tipo del documento:
Article