A 48-year-old woman complains about weakness, weight loss, appetite loss, headache. The patient had acute glomerulonephritis when she was young. She has been suffering from arterial hypertension since she was 25. She didn't undergo systematic treatment, consulted a doctor rarely. Examination revealed signs of chronic renal insufficiency of the I stage (creatinine - 0,43 millimole/l). What dietary recommendations are the most reasonable?