This document discusses fertility and infertility. It defines fertility as the union of an egg and sperm cell, and infertility as the inability to produce offspring. Male infertility can be caused by poor sperm quality or quantity, and is prevented by eating nutritious foods, abstaining from alcohol and smoking, getting adequate sleep. Female infertility can be caused by ovulation problems, hormonal imbalance, poor egg quality, or tube blockages. Risk factors and preventive measures are provided for both male and female infertility. The document emphasizes that maintaining a healthy lifestyle through self-discipline is key to reproductive health.