How much water should you drink per day? (and why it affects weight loss)

Why dehydration is secretly sabotaging your progress

Thirst and hunger signals come from the same part of the brain. When you are mildly dehydrated, your body sends a signal that feels exactly like hunger — causing you to eat when all you actually needed was a glass of water. This is one of the most common hidden reasons people overconsume calories without realising it.

Thirst and hunger signals come from the same part of the brain. When you are mildly dehydrated, your body sends a signal that feels exactly like hunger — causing you to eat when all you actually needed was a glass of water. Knowing how much water you should drink per day is one of the simplest fixes for this hidden cause of overeating.

How much water do you actually need?

• General recommendation — 2 to 3 litres per day for most adults
• By body weight — drink 30–35 ml per kg of body weight (at 70 kg, that is about 2.1–2.5 litres)
• Active days — add an extra 500 ml for every hour of exercise
• Hot weather — increase intake by 500 ml to 1 litre on warm days
• how many liters of water per day you need depends mostly on water intake by body weight and your activity level — the 30–35ml/kg rule above is your baseline, adjusted up for exercise and heat.

5 Easy Ways to Drink More Water Daily

• Start your morning with a full glass of water before coffee or chai
• Keep a water bottle on your desk — what is visible gets used
• Drink a glass of water before every meal — it also naturally reduces how much you eat
• Set reminders every 2 hours on your phone
• Use Caloura's hydration log and smart reminders to track and stay on target daily

does drinking water help you lose weight

Yes, in two ways. First, mild dehydration mimics hunger, so staying hydrated prevents you from eating when you're actually just thirsty (thirst vs hunger confusion is extremely common). Second, drinking a glass of water before meals naturally reduces how much you eat, since it partially fills your stomach. How much water should you drink to lose weight doesn't need a special formula beyond your normal daily target — consistency matters more than drinking extra.

Signs of Dehydration: How to Know You're Not Drinking Enough

• Dark yellow urine — aim for pale yellow
• Headaches in the afternoon with no clear cause
• Constant hunger even after eating a full meal
• Low energy and poor concentration during the day

Track hydration alongside calories in one app

Caloura is a hydration tracking app with a built-in hydration log so you can track your water intake right next to your meals...