What should you do? The weather is hot~!

What are the risks?

Dehydration: One of the biggest dangers of a heat wave is the increased risk of dehydration.
This is the loss of water from the body, and with it important blood salts like potassium and sodium which play a vital role in the function of organs such as the kidneys, brain and heart.
It can lead to confusion, lethargy and problems with breathing and heart rate.

Heat stroke or exhaustion: Under normal circumstances the sweat we produce when we get hot keeps us cool when it evaporates from the surface of our skin.
However, on extremely hot days, or when we over-exert ourselves, this system can fail, and body temperature can start to climb to dangerous levels.
This leads to heat stroke or exhaustion. This can cause headaches, dizziness and muscle cramps, but it can also be life-threatening.
It is particularly dangerous because symptoms can come on very rapidly, and - unless you are watching for the signs - very little warning.

Sunburn: A sun tan may look nice, but it is actually a sign of damage to the skin.
Not only is sunburn painful, it can accelerate the ageing process, and increase the risk of skin cancer, including the potentially fatal form, melanoma.

Tips:

1. Eat spicy foods: Have you ever started to feel sweaty after eating spicy foods? They can cause you to perspire, and occasionally create an endorphin rush. That might be why regions with hot climates eat so many spicy foods.

2. Practice yoga: Shitali pranayama, or the cooling breath, is a yoga move that’ll cool you down in no time. It’s rather similar to the way dogs cool themselves by sticking out their tongues while panting.

3. Wet the back of your neck or wrists with salt water: Instead of wetting your wrists directly, you can also get a little plastic baggie and fill it with ice water. Wrap a thick paper towel around the baggie and place it on the back of your neck or wrist once you start feeling the heat. Keep reading after the jump for the rest.

4. Make fake sweat: The perspiration process cools your body down very efficiently. Instead of using your body’s own stinky sweat, you can speed up the process by using a spray bottle with salt water (and portable fan, if possible).

5. Wear sandals: Much of your body’s heat is released through the soles of your feet. Keeping them uncovered will allow your body to cool itself more efficiently.

6. Wear white: All other things being equal, white clothes will reflect more sunlight than any other color. (Make sure the clothes are lightweight and you’re wearing proper sunblock, too.)

7. Drink a glass of water: Even if you’re not thirsty, water will help. Your body loses fluids very quickly when you’re in the sun. Once you feel thirsty, your body is telling you you waited too long to have a drink. Be sure not to have too much water, though! (Stay away from alcoholic drinks. Caffiene, sugar, and sports drinks are okay, but not as good as pure water.) As you will be losing more fluid than normal, it is important to top up your supplies.
The best way to keep yourself hydrated is to drink water, and to sip it, rather than gulp it down.
On an average day, a person of normal weight - 58kg (128lb) - should drink 8 average-sized glasses of water.
As a general rule, for every 2lbs of body weight, you need one ounce of water.
In very hot weather, consumption should be increased. However, drinking excessive amounts can bring problems of its own.
You might think a cold beer is exactly what the doctor ordered, but in fact, alcohol dehydrates the body, and consumption should be kept to a minimum.
If you can't face drinking lots of water, non-carbonated soft drinks, such as fruit juice, are a reasonable alternative.

8. Ventilate your home: Keep windows open all day and all night and use fans.
This is particularly important at night, when the body cools down.

9. Avoid heat traps: Try to avoid anywhere where shelter is minimal, and ventilation poor. Parked cars can be a particular hazard.
If you can, try to stay in an air-conditioned environment.
If you have no alternative, but to travel in a hot, stuffy environment - for instance on the Tube - then make sure you carry a bottle of water with you.
If you face a long journey, it may be wise to plan breaks to go above ground for some fresh air.

10. Be sensible about exercise: Do not exercise vigorously during the hottest times of the day. Instead, run, jog or exercise closer to sunrise or sunset.
Take things slowly and adapt to the pace of life in the sun. If you feel breathless or your heart is pounding, stop what you are doing and try to cool your body down, for example, by taking a cool shower. Rest if you feel faint or dizzy.

11. Take a dip: Water exercise is a great alternative in hot weather. Water keeps your body cool and reduces how difficult you perceive your workout to be. Be sure to drink plenty of water even while swimming to ensure that you are properly hydrated. Hot weather isn't the time to take risks. Even healthy people should take it easy in extremely high temperatures and everyone should understand how to exercise safely and effectively at the height of the season. Summer brings many fun and exhilarating opportunities to get outside, so enjoy yourself!

What they say?

According to treehugger.com, there are some psychological tricks you can play on yourself that work to help one cool down. Don't wear jewelry, don't wear underwear. Wear your hair up. Turn on nightlights only. Postpone stressful tasks for another day. Use your water taps and run your wrist under them, often. Splash cold water on your face.

Don't think you should only drink cold drinks. A nurse in England, who works in a hospital with no air-conditioning, said they drink warm tea. Why? Hot drinks make one perspire more and this cools the body down.

Another thoughtful blogger on treehugger.com said he does what his dad told him. He fills his bathtub with cold water only and adds some salt. This is supposed to make the water colder. Then he put a fan in his bathroom facing his bedroom. This can only work if you live in such a configuration. The cooler air is drawn by the fan and heads to the bedroom. Hmmm ...; a possibility.

Wear a short sleeve shirt and/or long pants. Squirt water on sleeves or pants. The cooling sensation will chill you right down. This works very well, but only if you are home alone or with a close associate. It is not always a pretty sight to behold.

Of course, there is always the ole drinking lots of water. Tried and true, this works, too. Contrary to popular belief, ice cubes aren't always such a good idea, even though very cold ice water tastes so good. The colder the water, the more energy your body spends making it body temperature so it can use it.

Stay out of direct sunlight, if possible. A wide-brimmed hat is a must and wear light colors and loose-fitting clothes. We all know this, but how many of us do it? Cotton and linen work the best. Bedouins — in an arid humid client, believe it is best to wear two or more layers of cotton.
If you don't have AC and have two floors, stay downstairs. Hot air rises. Stick as close to the ground as you possible can.

Long a favorite, the hand-held paper fans are not all that helpful. The energy expended to wave the fans in front of your face burns calories and raises your core temperature. But, if it burns calories ...;

Eat less. Do less. Use products with mint in them. Mint creates a cooling sensation.

Take off your shoes when indoors. Much of the body's heat is released through the soles of the feet.

P/s: Hope it is informative and can help. I got this from couple of sites online. =) enjoy~