Journal
NUTRIENTS
Volume 13, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/nu13124399
Keywords
potassium; calcium; calcium retention; acid-ash hypothesis
Categories
Funding
- Alliance for Potato Research and Education
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Potassium supplementation may have a favorable effect on urinary calcium excretion and urine pH, but did not show significant impact on calcium retention according to the study.
Potassium supplementation has been associated with reduced urinary calcium (Ca) excretion and increased Ca balance. Dietary interventions assessing the impact of potassium on bone are lacking. In this secondary analysis of a study designed primarily to determine blood pressure effects, we assessed the effects of potassium intake from potato sources and a potassium supplement on urinary Ca, urine pH, and Ca balance. Thirty men (n = 15) and women (n = 15) with a mean +/- SD age and BMI of 48.2 +/- 15 years and 31.4 +/- 6.1 kg/m(2), respectively, were enrolled in a cross-over, randomized control feeding trial. Participants were assigned to a random order of four 16-day dietary potassium interventions including a basal diet (control) of 2300 mg/day (~60 mmol/day) of potassium, and three phases of an additional 1000 mg/day (3300 mg/day(~85 mmol/day) total) of potassium in the form of potatoes (baked, boiled, or pan-heated), French fries (FF), or a potassium (K)-gluconate supplement. Calcium intake for all diets was approximately 700-800 mg/day. Using a mixed model ANOVA there was a significantly lower urinary Ca excretion in the K-gluconate phase (96 +/- 10 mg/day) compared to the control (115 +/- 10 mg/day; p = 0.027) and potato (114 +/- 10 mg/day; p = 0.033). In addition, there was a significant difference in urinary pH between the supplement and control phases (6.54 +/- 0.16 vs. 6.08 +/- 0.18; p = 0.0036). There were no significant differences in Ca retention. An increased potassium intake via K-gluconate supplementation may favorably influence urinary Ca excretion and urine pH. This trial was registered at ClinicalTrials.gov as NCT02697708.
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