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Children and young people with cystic fibrosis (CF) are at risk of hyponatraemic dehydration in hot weather, largely because they lose substantial amounts of salt in sweat. Secretion of aldosterone, secondary to sodium loss, can cause pseudo-Bartter’s syndrome, manifest as hyponatraemia, hypochloremia, hypokalaemia and metabolic alkalosis. Children and families are therefore advised to remain well hydrated during summer months and often increase their dietary sodium intake, or take additional supplements.
Recently, coconut water has been marketed as good fluid for rehydration purposes. The proposed advantages are that coconut water is …