Dietary acid load decreases with age and is associated with sagittal abdominal diameter: a nationally representative quantification study in US adults

Aging Clinical and Experimental Research · 2 authors, 2 centres

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TL;DR

It found that dietary acid load scores decreased with increasing age, with the lowest scores in those aged 80 years or older.

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All employed DAL scores tended to decline with increasing age, and participants aged 80 years or older yielded the lowest scores. The study concludes that the average US citizen aged 60+ consumed an acidifying diet, but the trend of increasing DAL with age observed in some non-Western countries may not apply to the US.

STUDY TYPE

cross-sectional

SPECIALTY

nutrition

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ORIGINAL PAPER

PMC10519865

Dietary acid load decreases with age and is associated with sagittal abdominal diameter: a nationally representative quantification study in US adults

Aging Clinical and Experimental Research

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ABSTRACT

Abstract Background Dietary acid load (DAL) has been associated with frailty and hip fractures in older adults, who often have a reduced kidney function and thus compromised buffering capacities. Studies to quantify DAL in older adults are scarce and controversies persist as to whether DAL in- or decreases with age. Aim To enhance the understanding of DAL in older individuals, we examined its relationship with increasing age and selected anthropometric data in a well-characterized sample of US adults. Methods Secondary data analysis of nationally representative data from the National Health and Nutrition Examination Surveys data (NHANES 2011–2016). The sample included n = 3018 adults aged 60+, which may be extrapolated to represent n = 45,113,471 Americans. DAL was estimated using 4 formulas, including Potential Renal Acid Load (PRAL) and Net Endogenous Acid Production (NEAP). Results All employed DAL scores tended to decline with increasing age. Participants aged 80 years or older yielded the lowest DAL scores. The average US citizen aged 60+ consumed an acidifying diet, yet there were sex-specific differences in the adjusted means for some scores. NEAP was positively correlated with both body mass index ( r = 0.26, p < 0.001) and the sagittal abdominal diameter ( r = 0.31, p < 0.001) in this nationally representative sample. Conclusion The previously reported phenomenon of increasing DAL values in older people in non-Western countries may not apply to the US. Our findings may constitute an important step towards a better understanding of DAL in older US adults, and highlight the need for additional population-specific research in the field. Supplementary Information The online version contains supplementary material available at 10.1007/s40520-023-02508-6. Keywords: Dietary acid load, Nutrient intake, National Health and Nutrition Examination Surveys, Potential renal acid load, Anthropometric data, Net endogenous acid production

CITATION EXPORT

Maximilian Andreas Storz, Alvaro Luis Ronco. Dietary acid load decreases with age and is associated with sagittal abdominal diameter: a nationally representative quantification study in US adults. Aging Clinical and Experimental Research. (2023). https://doi.org/10.1007/s40520-023-02508-6

AUTHORS

2 · 2 CENTRES

Maximilian Andreas Storz, Alvaro Luis Ronco

1Department of Internal Medicine II, Centre for Complementary Medicine, Freiburg University Hospital Faculty of Medicine, University of Freiburg, Freiburg, Germany
2Unit of Oncology and Radiotherapy, Pereira Rossell Women’s Hospital, Montevideo, Uruguay