Some medications can affect the quality or quantity of a man's sperm. lead, and chemical solvents can increase the percentage of damaged sperm, so men. Apr 3, - Maintain a healthy weight. Some research suggests that increasing body mass index (BMI) is linked with decreasing sperm count and sperm movement. Eat a healthy diet. Choose plenty of fruits and vegetables, which are rich in antioxidants — and might help improve sperm health.