The bleeding that occurs while you take the inactive pills isn't the same as a regular period. Nor is the bleeding necessary for health. This is good news if you take birth control pills and want more control over your menstrual cycle, either for personal or medical reasons.
To prepare for the glucose tolerance diagnostic test: 1  Eat a balanced diet that contains at least 150 grams (g) of carbohydrate per day for 3 days before the test. Fruits, breads, cereals, grains, rice, crackers, and starchy vegetables such as potatoes, beans, and corn are good sources of carbohydrate.
The American Diabetes Association notes that starchy foods like potatoes, corn, and peas are great sources of vitamins, minerals, and fiber, but recommends skipping those with added fat or sodium. You can test your blood sugar two hours after eating to find out what effect any particular food has on your blood sugar.