In a randomised , open , crossover , single-centre study ( conducted in Prague , Czech Republic ) , we assigned @ patients with type @ diabetes treated with oral hypoglycaemic agents , both men and women , age @-@ years , BMI @-@kg / m ( @ ) and HbA@c @-@ @ % ( @-@mmol / mol ) , to follow two regimens of a hypoenergetic diet , A@ and B@ , each for @weeks .