article taken from babycentre...
Question: What type of diet should I follow if I have gestational diabetes?
Answer: Good nutrition is especially important during pregnancy if you've developed gestational diabetes. Diabetes develops when your body can't efficiently produce or use insulin, a hormone made by the pancreas that allows cells to turn sugar in your blood (glucose) into usable fuel. When large amounts of glucose accumulate in your blood, it means that your cells aren't getting the fuel they need. High blood sugar can be harmful for you and your developing baby, so it's important to try to control it.
One way to keep your blood sugar levels under control is to follow a specific meal plan. If dietary changes aren't sufficient to keep your blood sugar in a healthy range, you'll need to take insulin as well. you will need to balance your meals with just the right amounts of protein, carbohydrates, and fat, vitamins and minerals.
Here are some general guidelines:
Eat a variety of foods, distributing calories and carbohydrates evenly throughout the day. Make sure both your meals and your snacks are balanced.
Don't skip meals. Be consistent about when you eat them and the amount of food you eat at each one. Your blood sugar will remain more stable if your food is distributed evenly throughout the day and consistently from day to day.
Eat a good breakfast. Your blood glucose levels are most likely to be out of whack in the morning. To keep your level in a healthy range, you may have to limit carbohydrates (breads, cereal, fruit, and milk), boost your protein intake, and possibly avoid fruit and juice altogether.
Include high-fibre foods. These foods are broken down and absorbed more slowly than simple carbohydrates, which may help keep your blood sugar levels from going too high after meals.
Limit your intake of foods and beverages that contain simple sugars such as soda, fruit juice, flavored teas, and most desserts or avoid them altogether. These foods can quickly elevate your blood sugar.
Milk is high in lactose, a simple sugar, so if you drink more than two or three glasses a day, you may need to limit the amount you drink and find an alternative source of calcium. If you're looking for a new beverage of choice, try club soda with a squeeze of lemon or orange, or unsweetened decaffeinated iced tea.