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You drink water even when you’re not thirsty
You drink water even when you’re not thirsty
ISTOCK/RIDOFRANZ

The best way to know if your body really needs more water is to be consciously aware of whether or not you actually feel thirsty. “Our bodies are so programmed to fight against dehydration because we’ve always been living in fear of scarcity or not having enough, so we have all of these built-in mechanisms to protect us against that,” Hew-Butler says. “One of these mechanisms that all animals have is thirst. Thirst is every body’s individual monitor that lets them know if they need more. The more water you need, the thirstier you get.”