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Do I need to drink at least 8 glasses of water a day?

Do I need to drink at least 8 glasses of water a day?

“Drink more water” is the single most common piece of nutrition advice I hear trainers tell their clients. And it has to be water. Soft drinks, flavoured drinks, milk, and caffeinated drinks don’t count. And at least 8 glasses a day. I know it’s...