Iron intake and potassium requirements
Iron intake has not been shown to directly determine or modify potassium requirements in the available clinical evidence.
Evidence on iron–potassium interaction
A 32-week randomized clinical trial in older women found that lower intakes associated with worse physical performance included both iron and potassium, but this association did not establish that iron intake changes potassium requirements. [1]
A systematic review of randomized trials assessing micronutrient supplementation found that evidence for biological effects of multiple micronutrients was limited and methodologically constrained, and it did not demonstrate clear micronutrient-specific interactions that would change potassium requirements. [2]
Practical interpretation
Iron intake changes should be addressed as an isolated deficiency or treatment target rather than used to adjust potassium requirements, because clinical trials have not established a cause-and-effect relationship between iron intake and potassium requirement changes. [1], [2]
Initiation thresholds and targets
No guideline-based thresholds exist in the cited evidence for adjusting potassium requirements based on iron intake. [2]
Common pitfalls to avoid
Using correlation between low iron intake and low potassium intake to infer that iron intake governs potassium requirements should be avoided, because the available trial evidence supports association rather than requirement-setting. [1]
When further clarification is needed
Clinical situations involving abnormal potassium status should prompt direct assessment of potassium balance and contributing causes rather than inferring potassium needs from iron intake level, because the reviewed evidence does not define iron-driven changes in potassium requirements. [1], [2]