Lose (or gain) some weight. What better reason to stick to your New Year’s resolution of losing a few pounds? Dr. Brasner warns that being overweight can negatively impact fertility levels, so try eating a low-carb diet that contains lots of fresh fruits and veggies and lean protein, and doing low impact aerobic workouts like walking or swimming. Even a 10-pound weight loss can have a very positive effect. A note to you underweight gals: you’re not in the clear either – try including more healthy fats (olive oil, almonds, and fatty fish like salmon) in your diet to help you get up to your optimal weight.