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Moderating carbohydrate digestion rate promotes metabolic flexibility in mice

Hayes, A. M. R.; Swackhamer, C.; Quezada-Calvillo, R.; Butte, N. F.; Sterchi, E. E.; Nichols, B. L.; Hamaker, B. R.

2023-01-08 physiology
10.1101/2023.01.08.523060 bioRxiv
Show abstract

Superior metabolic flexibility, or the ability to efficiently switch between oxidation of carbohydrate and fat, is inversely associated with obesity and type 2 diabetes. This study examined the impact of dietary carbohydrate digestion rate on metabolic substrate utilization and metabolic flexibility. We employed percent relative cumulative frequency (PRCF) analyses coupled with a new application of modeling using the Mixed Weibull Cumulative Distribution function to examine respiratory exchange ratio (RER) data from wild-type mice and mice lacking the mucosal maltase-glucoamylase enzyme (Mgam, null) under different dietary carbohydrate conditions. We further devised a Metabolic Flexibility Factor (MFF) to quantitate metabolic flexibility, with higher MFF indicating higher metabolic flexibility. The collective results indicated that a diet high in slowly digestible starch exhibited higher metabolic flexibility (MFF) than diets high in resistant starch, sucrose, or fat. These findings show a new-found benefit of consuming slowly digestible carbohydrates for improved metabolic health.

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