Water intake refers to the amount of water a person consumes daily. It is essential for maintaining hydration, supporting bodily functions, and regulating temperature. The recommended daily water intake varies by age, sex, and activity level, but a common guideline is about 8 cups (or 2 liters) per day for adults. Factors influencing water intake include climate, physical activity, and overall health. Foods also contribute to hydration, as many fruits and vegetables contain high water content. Monitoring water intake can help prevent dehydration, which can lead to fatigue, headaches, and other health issues.