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Metabolic and cardiovascular responses to liquid and solid test meals
1School of Biomedical Sciences, University of Nottingham Medical School, UK.
The British Journal of Nutrition
|May 13, 1998
Summary
The physical form of a meal significantly impacts physiological responses. Solid meals increase metabolic rate and heart rate more than liquid meals, affecting blood flow differently.
Area of Science:
- Human physiology
- Nutritional science
- Metabolic studies
Background:
- Previous studies suggest differences in physiological responses between liquid and solid test meals.
- The impact of meal texture on metabolic and cardiovascular functions requires further investigation.
Purpose of the Study:
- To compare the metabolic and cardiovascular responses to isoenergetic high-carbohydrate liquid versus solid test meals in healthy men.
- To elucidate the effect of nutrient physical form on postprandial physiological changes.
Main Methods:
- Eight healthy men consumed isoenergetic (2.1 MJ) high-carbohydrate liquid or solid test meals after an overnight fast.
- Measurements included metabolic rate, respiratory exchange ratio, forearm blood flow, heart rate, serum insulin, and blood glucose levels.
Main Results:
- Both meal types increased metabolic rate, but the increase was significantly greater after the solid meal.
- Forearm blood flow increased after the liquid meal but decreased after the solid meal.
- The solid meal elicited a significantly greater heart rate response, higher serum insulin, and blood glucose levels compared to the liquid meal.
Conclusions:
- The physical form of a test meal significantly influences metabolic and cardiovascular responses.
- Solid meals lead to a more pronounced metabolic and cardiovascular stimulation compared to liquid meals of equivalent caloric and macronutrient content.