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Originally Posted by ukguy84
This advice is for your friend, but its also the same for everyone.
If he is bigger than average, he will lose more liquid in the heat, make sure he has a bottle of water with him every time he goes out, it is also a good excuse to drink more beer!
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If you are going to give advice like this, please make sure it is at least somewhat accurate.
The loss of liquid by perspiration is NOT properly replenished by the consumption of water. A lot of minerals are lost as well and if you want to do it right the replenishment should include electrolytes.
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Technically, electrolytes are minerals (magnesium, potassium, sodium, and calcium) that are lost through perspiration or other forms of dehydration, particularly in heat stress situations. Under ideal conditions, electrolytes flow through muscle cells to keep them functioning normally. Perspiration depletes cells of fluids and weakens the muscle tissue.
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Aside from the sugar content most sports drinks do a great job, some do, however, lack potassium.
As for the beer ... we (almost) all take pleasure in consuming that and in smaller amounts it actually may be better than water alone.