Water has the capacity to regulate the internal temperature of the body in response to the outside temperature.
Through sweating, water prevents overheating when the outside temperature is very high (1).
Sweating is our main mechanism for thermoregulation: in fact, the evaporation of sweat entails a loss of calories in the form of heat (2). This released energy enables a decrease of our internal temperature, which, without this mechanism, would rise during hot weather and fever. To maintain stable temperature, it is necessary to sweat and particularly, to allow sweat to evaporate!
Don’t forget to drink!
Sweating means loss of water and the risk of dehydration in case of insufficient intake of water. We can lose a significant amount of water via sweat, from 0.5 to over a full liter per hour (3)! It’s recommended to drink regularly during exercise, especially if it’s intense.
Related on Nestlé Waters:
Promoting Healthy Hydration
How much water is in the human body?
Bottled water quality
Sources: (1) Montain S.J., Military Medicine, 1999 ; (2) Wenger, Journal of Applied Physiology, 1972 ; (3) Rerher and Burke, Australian Journal of Nutrition and Dietetics, 1996