Maintaining a healthy weight significantly influences fertility because both underweight and overweight conditions can disrupt hormonal balance. In women, excess body fat can lead to irregular menstrual cycles and ovulation disorders, while being underweight may prevent menstruation altogether. In men, obesity can adversely affect sperm quality and testosterone levels. Achieving a normal weight improves the chances of conceiving by restoring hormone function, promoting regular cycles, and enhancing overall reproductive health. Healthy weight management through balanced nutrition and regular exercise can thus optimize fertility and support successful conception.