Dietary acid load, insulin sensitivity and risk of type 2 diabetes in community-dwelling older men
We tested the hypothesis that dietary acid load may increase the risk of type 2 diabetes, and studied the association between acid load and insulin sensitivity as a possible mechanism involved.
An observational survey with prospective follow-up including 911 non-diabetic Swedish men aged 70–71 years was carried out. The gold standard euglycaemic–hyperinsulinaemic clamp technique and the OGTT were used to determine insulin sensitivity and beta cell function, respectively. Diabetes incidence was assessed during 18 years of follow-up. Renal function was estimated from serum cystatin C concentrations. Dietary acid load was calculated as potential renal acid load (PRAL) and net endogenous acid production (NEAP) algorithms from 7 day food records. Adequate dietary reporters were identified by Goldberg cut-offs.
PRAL and NEAP were not associated with insulin sensitivity or beta cell function. Underlying kidney function or consideration of dietary adequate reporters did not modify these null findings. During follow-up, 115 new cases of diabetes were validated. Neither PRAL nor NEAP was associated with diabetes incidence.
Our results do not support the hypothesis that dietary acid load influences insulin sensitivity, beta cell function or diabetes risk. Interventional studies modifying acid–base dietary intake are needed to further elucidate a possible role of acid load in the development of type 2 diabetes.
KeywordsDiabetes incidence Dietary acid load Insulin resistance Insulin sensitivity Kidney function
Monounsaturated fatty acid
Net endogenous acid production
Potential renal acid load
Polyunsaturated fatty acid
Saturated fatty acids
Urinary albumin excretion rate
Uppsala Longitudinal Study of Adult Men
We are indebted to all participants in the study and are grateful to the ULSAM group for their assiduous and thorough data collection.
This work was supported by the grants from the Swedish Research Council and the Westman Foundation. Baxter Novum is the result of a grant from the Baxter Healthcare Corporation to Karolinska Institutet.
Duality of interest
BL is affiliated with Baxter Healthcare Corporation. All other authors declare that there is no duality of interest associated with their contribution to this manuscript.
HX carried out the studies and data analyses and drafted the manuscript. JJC conceived the study, participated in its design and coordination, and helped to draft the manuscript. The other authors participated in its design and contributed to developing the manuscript to its final form. All authors approved the final version. JJC is guarantor of this work.
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