Kidney stone risk was found to increase to 5.4% (6/112), with a calcium/creatinine ratio greater than 0.2 being an important risk factor in one study (Epilepsia 2000;43:1168–71). But treatment with Polycitra-K (an oral potassium citrate supplement) appears to reduce this risk, she said.
A 2004 study found that the ketogenic diet is used at 80 centers in the United States and at 70 centers in 41 countries. Continued use in patients has ranged from 1 to 45 years, with a median of 8 years. The average number of people per country using the diet was 71.6, with 5.4 started per year–with a range of 0–40 (Epilepsia 2004;45:1163).