As summer temperatures climb into the 90s, older people are in danger of conditions caused by extreme heat, such as dehydration and hyperthermia, which can lead to heat exhaustion and its most serious form, heat stroke.

About 60% of your body is made up of water. All systems in your body rely on water to function properly. Not having enough water in your body can reduce your energy and make you feel tired and dizzy, and can harm your kidney function. Here’s how to stay hydrated.