Here are the times you need to drink water:
When you think you are hungry
You may actually be thirsty. Most people don’t realize they’re actually thirsty when hunger seems to be hitting. The brain recognizes these stimuli as similar. So before you head to the kitchen, drink some water first. Then, take a few minutes to see if it satisfies your cravings.
When you wake up
First thing in the morning is one of the best times to rehydrate. Your body has been through a long fast. To start simple, squeeze half a lemon into your first glass of water in the morning for a boost of antioxidant phytonutrients, vitamin C, and potassium.

You should not wait until you are thirsty to drink water (Photo: Gettyimages).
Whenever you sweat
According to Webmd , anything that makes you sweat, a sauna or hot tub, time spent outdoors on a hot, muggy day, will dehydrate your body. The same goes for exercise. As your muscles heat up, your body sweats to release heat. You'll need to cool down with plenty of water.
Before, during and after exercise
You need plenty of water to replace what you lose. Before you exercise or spend time outdoors, drink about 16-24 ounces of water. Then, drink 5-12 ounces of water every 10-15 minutes while you are active. Then, drink another 16-24 ounces.
When you are sick
Hydration is key to healing when you’re sick. Symptoms like diarrhea, vomiting, and fever can cause severe dehydration. At the first sign of illness, drink plenty of water, especially if you’re not hungry. At the same time, stay away from alcohol and caffeine, which will dehydrate you even more.
When on the plane
Ever wonder why you get so thirsty and parched when you fly? It’s all about altitude. The higher a plane flies, the drier the air in the cabin becomes. To combat the extreme humidity, bring an empty water bottle with you to refill as needed during the flight.
When you get a massage
Drinking water while doing the massage will help your muscles become softer and more supple. This exercise also releases substances that you should flush out afterwards with plenty of water.
Before menstruation
You can ease premenstrual discomfort and reduce bloating by drinking plenty of water before and during your period. One of the biggest causes of cramps or headaches is dehydration.
A recent study of young women with menstrual cramps found that drinking more water shortened their menstrual cycles, easing pelvic pain.
When you have a headache
One of the leading causes of migraines is dehydration. Some people report that even a slight decrease in fluid intake can cause severe headaches. It can also make you feel lightheaded and in some cases, even require medical treatment.
Especially if you are prone to migraines, always carry a water bottle with you and keep track of your water intake.
Before eating
Drinking water before meals may help you lose weight. A small study tested people who drank 500ml of water about 30 minutes before meals and throughout the day as they wished. Over 12 weeks, those who pre-loaded lost more weight than those who did not follow this routine.
When you want to lose weight
Water isn't just a calorie-free way to help you feel full. It can also speed up your metabolism.
In one study, 50 overweight girls drank about 2 cups of water half an hour before breakfast, lunch, and dinner without making any other changes to their diet. After 8 weeks, they lost weight and had a decrease in their body mass index and body composition scores.
Water also speeds up lipolysis, the process by which the body burns fat for energy.
The body needs about 2-2.5 liters of water from food and drinks every day to compensate for the amount of water lost through different ways. Two-thirds of the water is provided by drinks, the rest is provided by other foods. This need depends on body weight and physical activity.
For example, a 50-year-old person weighing 63kg has a water requirement of: 63x35 = 2,200 ml/day, equivalent to 10 to 12 glasses of water/day.
In addition, do not drink water that has been boiled many times, do not drink a lot of water before going to bed, and do not drink soft drinks instead of filtered water. Beverages containing alcohol, tea, and coffee have diuretic effects, so they increase the rate of water loss through the kidneys, so they should be limited.
Source: https://dantri.com.vn/suc-khoe/thoi-diem-tot-nhat-trong-ngay-de-uong-nuoc-ban-khong-duoc-bo-lo-20250701195923177.htm
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