The relationship between sodium intake and hydration is significant since sodium helps retain water in the body. Sodium plays a vital role in maintaining fluid balance and is essential for nerve function and muscle contractions. When sodium levels are too low, the body may lose excessive water, leading to dehydration. Conversely, consuming too much sodium can lead to water retention and elevated blood pressure. It's crucial to balance sodium intake with hydration efforts, particularly during intense physical activities, to support performance and overall health.