A person taking diuretics, however, may have problems, and may need medical supervision. Depletion of potassium can lead to heatstroke. A normal diet should satisfy the needs of workers in hot environments. Alcohol reduces heat tolerance, and is a common factor in heatstroke. It should not be consumed just before or while working in heat.
Many prescription drugs interfere with the body's ability to endure heat.
Diuretics and antihistamines are common examples. Ask your doctor's advice if you are taking prescription drugs and working in a hot environment. Generally, the body must work harder to maintain itself in hot weather. As a result, it is unreasonable to expect to accomplish as much on a very hot day as on a mild weather day. If you have predisposing factors for heat illnesses, be aware of them, and take it easier.