Hydration and Focus: The Overlooked Link

Have you ever felt foggy, tired or a bit cranky in the afternoon, and later realized you hadn't had much to drink all day? It happens more often than we think.

Water is easy to overlook. But staying well hydrated is one of the simplest things you can do to feel more alert and comfortable. Let's look at why it matters and how to make it easy.

Why your body needs water

Water is involved in almost everything your body does. It helps carry nutrients, keeps your temperature steady, cushions your joints and helps your body get rid of waste.

Harvard Health explains that water helps the body in many ways, including supporting normal heart function, blood pressure and digestion.

Your brain relies on your body working well. When you're low on fluids, you may notice it in how you think and feel.

How low fluids can affect focus

Even mild dehydration can make some people feel:

• Tired or low on energy
• Foggy or less able to concentrate
• Irritable or out of sorts
• Headachy
• Dizzy or lightheaded, especially when standing up

These feelings can be easy to blame on age or a busy day. Sometimes a glass of water and a short rest is all you need.

Why thirst can be harder to notice after 55

As we get older, our sense of thirst often becomes weaker. You may not feel thirsty even when your body needs fluids.

Other things can add to the risk:

• Some medicines, such as water pills, can cause you to lose more fluid.
• Some people drink less on purpose to avoid trips to the bathroom.
• Hot weather, illness, fever or diarrhea can cause you to lose fluids quickly.
• Living alone can make it easier to forget to drink.

This is why it helps to drink on a schedule, rather than waiting until you feel thirsty.

How much should you drink?

There is no single number that is right for everyone. Your needs depend on your size, activity, the weather and your health.

Harvard Health notes that many healthy people need about 4 to 6 cups of plain water a day, but some people need more, and some people with certain health conditions need less. Your doctor can tell you what's right for you.

Remember that other drinks and foods count, too. Milk, tea, soups and water-rich foods all add to your daily fluids.

Simple signs you may need more fluids

• Dark yellow urine. Pale yellow is usually a good sign.
• A dry mouth or dry lips
• Feeling tired or foggy in the afternoon
• Headaches
• Constipation

Easy ways to drink more through the day

Build it into your routine

• Drink a glass of water when you wake up.
• Have a glass with every meal.
• Drink a glass whenever you take your medicines.
• Keep a filled water bottle or glass where you can see it.

Make water more appealing

• Add a slice of lemon, lime, orange or cucumber.
• Try sparkling water if you like bubbles.
• Enjoy warm herbal tea in cooler months.
• Keep a pitcher of cold water in the fridge.

Eat foods with lots of water

• Watermelon, oranges, grapes and berries
• Cucumbers, lettuce, celery and tomatoes
• Soups and broths
• Plain yogurt

Limit drinks that work against you

• Sugary sodas and sweet drinks add sugar without much benefit.
• Too much alcohol can leave you dehydrated.
• Coffee and tea can be part of your daily fluids for many people, but keep caffeine earlier in the day to protect your sleep.

Hydration and sleep

If nighttime bathroom trips bother you, you don't have to drink less overall. Instead, drink more earlier in the day and a bit less in the last hour or two before bed.

The Sleep Foundation's sleep tips also suggest watching caffeine and alcohol later in the day, which helps both sleep and comfort at night.

Part of a bigger picture

Hydration works alongside other everyday habits. Harvard Health's list of ways to keep your brain young includes eating well, staying active, sleeping enough and managing health conditions such as high blood pressure.

A glass of water is a small thing. But small things done every day can help you feel more like yourself.

When to talk to your doctor

Talk with your doctor about how much to drink if:

• You have heart failure, kidney disease or another condition that limits fluids.
• You take water pills or other medicines that affect fluid balance.
• You often feel dizzy when standing up.

Seek care right away if you or a loved one have signs of serious dehydration, such as confusion, very little or no urine, a fast heartbeat, fainting, or being unable to keep fluids down.