Gestational diabetes: How to prevent?

I had gdm. I was craving for fast food every night and rice intake was high. The dietician advised me to change my rice to brown rice my bread to wholemeal bread. And have to take half portion of rice only. Eat more vegies and fruits. After eating try to walk atleast 30 mins to an hour. Drink water and avoid juices or teh tarik. U can have it actually but in small.quantity. unfortunately for me i was on metformin and insulin. Delivered my baby via csect weighing at 3.4kg and he is doing fine. Goodluck.