Read the following passage and answer the item that follows. Your answer to this item should be based on the passages only.

Swimming teaches you determination. Swimming teaches concentration. Swimming promotes teamwork. Swimming can be a powerful tool in learning to conquer fear. One theory is that submerging your body in cold water (68F and below) triggers a hunger response. Your brain doesn't realize this is a temporary situation, and a cascade of hormones signals tissues to store more fat for insulation, which in turn signals a need for fuel to store. Even when swimming hard, after a length of time in a cold pool, your core temperature will be slightly lowered. In addition, your body is expending more energy to maintain that temperature, which leads to greater fatigue than normal. Other things that can influence nausea when swimming is your levels of hydration and food intake. Make sure that you're hydrated before you swim as being dehydrated, especially when working hard and sweating, can lead to feelings of sickness in the water.