High carbohydrate diet ingestion increases post-meal lipid synthesis and drives respiratory exchange ratios above 1
Autor: | Hector E. Medina, Julio E. Rojas, Ruth Farington, Jon F. Harrison, Arianne J. Cease, Stav Talal |
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Rok vydání: | 2020 |
Předmět: |
Physiology
Aquatic Science 03 medical and health sciences Respirometry Eating 0302 clinical medicine Animal science Dietary Carbohydrates Ingestion Animals Molecular Biology Respiratory exchange ratio Ecology Evolution Behavior and Systematics 030304 developmental biology 0303 health sciences Meal Chemistry Lipid metabolism Carbohydrate Postprandial Period Dietary Fats Diet Respiratory quotient Insect Science Lipogenesis Animal Science and Zoology 030217 neurology & neurosurgery |
Zdroj: | The Journal of experimental biology. 224(Pt 4) |
ISSN: | 1477-9145 |
Popis: | Locusts have been reported to elevate metabolic rate in response to high carbohydrate diets; this conclusion was based on metabolic rates calculated from CO2 production, a common practice for insects. However, respiratory exchange ratio (RER, CO2 production divided by O2 consumption) can rise above 1 as a result of de novo lipid synthesis, providing an alternative possible explanation of the prior findings. We studied the relationship between macronutrient ingestion, RER and lipid synthesis using South American locusts (Schistocerca cancellata) reared on artificial diets varying in protein:carbohydrate (p:c) ratio. RER increased and rose above 1 as dietary p:c ratio decreased. Lipid accumulation rates were strongly positively correlated with dietary carbohydrate content and ingestion. RERs above 1 were only observed for animals without food in the respirometry chamber, suggesting that hormonal changes after a meal may drive lipid synthesis. Schistocerca cancellata does not elevate metabolic rate on low p:c diets; in fact, the opposite trend was observed. |
Databáze: | OpenAIRE |
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