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Your body keeps itself cool by letting heat escape through the skin, and by evaporating sweat (perspiration). If your body does not cool properly or does not cool enough, you might suffer from a heat-related illness.

Anyone can be susceptible to heat-related illness. Those at greatest risk are infants and young children, adults over 65, people who are homeless, people who are overweight, people who overexert during work or exercise, and people who are physically ill or on certain medications, such as for depression, insomnia, or poor circulation. Heat-related illness may be serious or even deadly if unattended.

Staying healthy during the summer is easier if you take the time to protect yourself by making sure you are drinking enough water and limiting your exposure to the heat. Follow these simple rules:

• Drink water. Even people that stay mostly indoors all day should drink at least 2 liters of water per day. People that spend time outdoors should drink 1 to 2 liters per hour that they are outdoors. People that do strenuous activity outdoors should be very careful, being your body can lose up to 4 liters of water per hour during strenuous activity. You should carry water with you and drink even if you do not feel thirsty. Be heat safe and avoid alcohol, which dehydrate the body. Avoid using salt tablets unless directed to do so by a physician.
• Dress for the heat. Wear lightweight, light-colored clothing. Light colors will reflect away some of the sun's energy. It is also a good idea to wear hats or to use an umbrella. Always apply sunscreen to exposed skin.
• Eat small meals and eat more often. Avoid foods that are high in protein which increase metabolic heat.
• Monitor Those at High Risk. Check on friends, family, and neighbors for signs of heat exhaustion or heat stroke. Infants and young children, of course, need much more frequent watching.
• Slow down. Avoid strenuous activity. If you must do strenuous activity, do it during the coolest part of the day, which is usually in the morning between 4:00 a.m. and 7:00 a.m.
• Stay indoors when possible.
• Take regular breaks when engaged in physical activity on warm days. Take time out to find a cool place. If you recognize that you, or someone else, are showing symptoms of a heat-related illness, stop activity and find a cool place. Remember, have fun, but stay cool!