Very heavy perspiring or severe diarrhea can result in a serious reduction in the body's water content known as dehydration.
I think they are all right.
By making them exercise more often
The easiest (and possibly tastiest) answer is nuts. All varieties of nuts: almonds, peanuts, cashews, pecans, hazelnuts – you name it. And for those of you who like it smooth, peanut butter is an excellent source of protein with 4 grams per tablespoon. Watch the salt though: the USDA recommends choosing unsalted nuts to keep the sodium intake low.
