At temperatures of 90 degrees or above, a person can lose up to half a gallon of water every ten minutes. Eat several small meals and avoid high-protein foods as they increase metabolic heat. If going outdoors is necessary, wear lightweight, light colored clothing, experts say. According to the Red Cross, heat exhaustion, which can lead to heatstroke, is a very serious condition. Symptoms include heavy sweating, weakness, vomiting, cold, clammy skin, a weak pulse, and fainting.
Heatstroke begins when a person's internal thermostat stops working.
Death or brain damage can occur within ten minutes if left untreated. Animals, too, are susceptible to heat-related illnesses. The pads on dogs' feet aren't like shoes. They will burn. Marks also pointed out the danger of leaving an animal unattended in a parked car.