The aim of the study is to assess the association between the calcium and phosphorus balance and the stage of kidney disease measured by creatinine clearence in patients with chronic kidney disease stage 4 and 5. The balance is measured a measurement between the recorded diatery intake and the urinary excretion. Additionally a comparison between image based diatery accessment and weighted records will be measured
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Comparison of diatery photograph method with weighted records.
Timeframe: 3 days
Calcium and phosphate balance in relation to the stage of kidney disease
Timeframe: 3 days