Hi jingles,
I had GD when I was on my 3rd trimester during my first pregnancy. It wasn't as simple as cutting down on sweets, it was a total diet overhaul and my gyne "forced" me to see a nutritionist weekly until I gave birth.
Here are some of the things I can still remember from 4 years ago:
1. Cut down on sweets (obviously)
2. Try to limit rice to 10 spoonfuls or 2 slices of whole wheat bread per meal
3. Eat fruits after every meal, they aid in the digestion of the food
4. Eat lots of veggies
5. Meat should be palm-sized only; fish serving can be slightly bigger
6. Regular exercise
7. Or at least walk for 10-15 minutes after every meal. This is a must especially after dinner because the blood sugar tends to shoot up when you wake up in the morning.
8. Avoid fastfood
I also had to check for my blood sugar level 6x a day during that trimester. Once each before and after taking breakfast, lunch and dinner.
Hope this helps. The guidelines above may seem tough but I know we will do everything for our babies' sake.
I haven't been tested yet but I'm keeping my fingers crossed that I will be GD-free during this pregnancy.