Making sure you drink a lot of water on a daily basis is important to maintain good health. Yet, a 2015 Harvard study found that almost 4,000 children do not drink enough water. The team also found 25 per cent said they didn't drink water at all during the day. However, this is not just as an issue with kids. There are many adults who are not staying hydrated during the day. Researchers say close to 75 per cent of people are more likely to be chronically dehydrated. This can have serious implications on our muscle strength and aerobic ability. Dehydration can also cause poor cognitive function. Here are a few warning signs you're really dehydrated and in need of some water.

If you're very dehydrated, it can lead to fainting. You might start to feel lightheaded when you stand up quickly after sitting or lying down. Such symptoms can happen when you don't drink enough water and it can also affect your blood pressure.

When you're dehydrated, your brain makes you more sensitive to pain. This means, anything and everything that hurts you causes even more pain in the slightest ways possible. This is when you must realize that you should be drinking more water.

If you notice your mouth drying up too much or getting sticky, you should start consuming more water. This happens because you're very dehydrated and all you need to do is drink water at regular intervals so that you can avoid this situation.

If you feel a faster heartbeat and quick breathing, it could be a sign of severe dehydration. This is because water loss can lead to a lower blood volume and it makes the heart work harder to move blood throughout your body. This is why, it is advised to keep your self hydrated at all times to raise your blood volume and let your heart rate return to normal.

When you're dehydrated, it can cause constipation issues and you might find it difficult to pass your stool all too well as it might look dry or small lumps. You will face difficulty in your bowel movements if you don't drink enough water. Water is needed to help you digest the food that you eat and also to move waste along your digestive tract.

Exercising for long will make you sweat out all the fluid in your body. This can lead to dry eyes or blurred vision. This in turn can irritate your eyes and so you must keep yourself hydrated so that you body gains back all its fluids and your eyes feel hydrated too.

Since your brain is more than 70% water, being dehydrated can slow down some types of brain function. It can in turn affect your memory, concentration as well as alertness. Not just that, even the slightest of dehydration can cause driving mistakes. Hence, make sure you're always well hydrated and make it a habit to sip on water at regular intervals.

If you're dehydrated, you'll know it through the colour of your urine. If it's a dark yellow to amber urine, it means you are dehydrated. You have healthy hydration levels if your urine is clear or light yellow in colour. Another way to find out about unhealthy hydration levles is to notice how less you urinate.

When you get dehydrated your muscles start facing the wrath of all that excessive heat produced in your body. Without anything to cool them down, all the activity takes a toll on them and they seize up. Even a change in electrolytes can make your muscles cramp up.