Eat more complex ("slow") carbs and limit highly processed ones.
Your body digests bad carbs (like cookies, cakes, white bread and white rice) quickly, and turns them into blood sugar. To drive down the blood-sugar spike, the pancreas releases insulin into the bloodstream.
Good carbs (those containing fiber, such as fruits, vegetables, beans and whole grains) are digested slowly and have a more gradual effect on blood sugar and insulin. Studies have found that high insulin levels appear to inhibit ovulation.