A 29-year old woman, who’s been known to have anorexia nervosa for many years, has also suffered from hypokalaemia for some time now. At the beginning, her serum potassium levels fluctuated, but the past three years they’ve been proven low at every blood test. Recently, in a two-monthly interval, she had blood tests again, and the results were as follows: - sodium: 146 and 147 mmol/l. - potassium: 2,4 and 2,3 mmol/l. - chloride: 104 and 102 mmol/l. - bicarbonate: 30 and 31 mmol/l. Also, her urine samples contained in two consecutive days an average amount of 110 mmol of sodium and 64 mmol of potassium, each day. Her blood pressure has been about 140/100 mm Hg for years and she’s never had ankle swelling. Her weight is 49 kg and she’s 1,75 m in length. She’s always denied the use of diuretics or laxatives. Although the hypokalaemia has been present for a long time now, the cause has never been investigated. Questions. 1. What’s the most likely cause of the hypokalaemia? 2. Assuming it’s not possible to treat the underlying cause, what’s the best intervention to treat this chronic form of hypokalaemia?