Hydration: how much water you actually need

Each day asks for a different amount

The famous eight-glasses rule is just a generic starting point, not a law. On a hot day in Brazil, sweating easily, your body asks for far more water than on a cool, still day. People who train, work outdoors or are breastfeeding also have different needs from someone in air conditioning all day. On top of that, part of your water comes from food — fruit, soups, salads and even coffee count. For all these reasons, chasing a single fixed number for everyone makes less sense than adjusting to your day.

• ✓Heat and sweat raise how much you need
• ✓Training, outdoor work and breastfeeding call for more
• ✓Part of your water comes from food: fruit, soups, salads

The signs of good hydration

Instead of counting milliliters all the time, you can pay attention to what your body shows. Urine color is a simple clue: a pale yellow usually points to good hydration, while a dark shade can signal you're short on water. Thirst, dry mouth, headache and tiredness can also show up when you've had too little. Keep in mind that thirst is already a warning that your body wants water, so it doesn't hurt to stay ahead of it through the day. These signs don't replace medical guidance, but they help you notice when to top up your glass.

Gentle ways to drink more

Building the habit of drinking water works better with gentleness than with rigid goals. Keeping a bottle always in sight, at work and at home, reminds you effortlessly. Tying water to moments that already exist helps too: a glass on waking, one before each meal, one when you open your laptop. If plain water bores you, a slice of lemon, mint or some fruit adds flavor without turning into sugar. The idea isn't to police every sip, but to make water a natural companion through the day — your health in your hands, one glass at a time.

• ✓Keep a bottle always in sight as a reminder
• ✓Anchor water to habits: on waking, before meals
• ✓Add flavor with lemon or mint instead of sugar