The familiar “eight glasses a day” figure isn’t based on strong evidence. Real needs vary with your body size, how active you are, the temperature around you, and what you eat — fruit, vegetables and soups all contribute to hydration.
A practical gauge is simpler than counting glasses: you’re probably well hydrated if you rarely feel very thirsty and your urine is pale yellow rather than dark. Drink more when it’s hot or when you’re exercising and losing fluid through sweat.
Some health conditions and medications change the picture, so if you’ve been advised to limit or increase fluids, follow that guidance over any general rule of thumb.
This is general information, not professional medical advice. For decisions about your situation, talk to a qualified professional.
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