Maintaining Cognitive Function: The Impact of Water Intake

by Natalie Meriwether, BSN

We’re always looking for ways to help support our cognitive function, and one simple strategy is staying hydrated.

Water is important for all functions of the body and our brains are no different. Keep reading to explore some of the potential benefits of sufficient water intake on cognitive health.  

How does hydration relate to cognitive function?

Did you know that water makes up about 75% of our brain? Given the significant role water plays in its structure, it’s no surprise that staying hydrated is important for our brain’s everyday functions.

Water helps the ability of our brain cells to communicate with each other and send messages to other parts of the body.

Adequate hydration also supports healthy circulation, promoting blood flow to the brain. Additionally, according to the National Institutes of Health, water supplementation may even help improve cognitive performance after experiencing dehydration.1

So, how much water should you be drinking every day?

Factors like age, weight, gender, and activity level can impact how much water you should drink daily. While there’s no magic number, a good rule of thumb is to consume eight 8-ounce glasses of water each day.

Remember that different circumstances, like hot weather, can change your hydration needs so it’s best to listen to your body and drink when you feel thirsty. Water is often the best choice, but other beverages and even high-water-content foods can help contribute to hydration.

3 Ways to Increase Your Water Intake

Along with keeping your brain healthy, staying hydrated may also support:

  • Healthy and hydrated skin
  • Digestive health
  • Body temperature regulation
  • Weight management
  • Energy levels
  • Overall well-being

>> Shop Puritan’s Pride Brain Health Supplements


Water intake and hydration status impact most functions of the body, including brain health. Drinking enough water is a simple and easy way to help avoid dehydration and support your cognitive function. So, fill up your glass and start sipping!


  1. Zhang J, Zhang N, He H, Du S, Ma G. nt J Environ Res Public Health. 2020 Oct 24;17(21):7792. doi: 10.3390/ijerph17217792. PMID: 33114364; PMCID: PMC7662706.