Thirty-nine healthy , normotensive volunteers [ 21 women and 18 men ; mean SD age : 37 15 y ; BMI ( in kg/m ( 2 ) ) : 23.0 2.8 ] received a meal with 3 mmol K and 65 mmol Na ( low-potassium , high-sodium meal ( LKHN ) ] , a meal with 38 mmol K and 65 mmol Na [ high-potassium , high-sodium meal ( HKHN ) ] , and a control meal with 3 mmol K and 6 mmol Na ( low-potassium , low-sodium meal ) on 3 separate occasions in a randomized crossover trial .