How Does Dehydration Affect Diabetes

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Our young type 1 diabetic grandson doesn’t always drink as much water as he should which makes me wonder how does dehydration affect diabetes?

Seriously, we can all be affected by dehydration for various reasons.

We can easily become dehydrated during the summer when the sun is out and the temperatures are high and we seem to be outside being more active than in other seasons but what about now?

I mean it is November, in Canada!

This usually means cold and flu season.

Add to that the fact that we are still in the middle of a global pandemic and the odds of becoming ill and dehydrated is substantially increased.

We all know that with the flu comes:

  • nausea
  • vomiting
  • diarrhea
  • runny nose

Pretty easy to see how dehydration can happen pretty quickly with all that going on right?

So what about our diabetic friends and family members? How does dehydration affect them?

The most widely known tell-tale symptoms of diabetes are frequent urination and excessive thirst, clearly, a recipe for severe dehydration don’t you think?

Since high blood sugars are what causes those symptoms to begin with and we know diabetics are battling those blood sugars daily I think we need to learn what effect dehydration has on our diabetic friends and family and how we can help them.

Water impacts our body’s more than we realize

How Does Dehydration Affect Diabetes - drink plenty of water

Were you aware that different tissues within our body are made of different compositions?

For example, our body is made up of 60% water, our muscles are made up of 75% water and our brain consists of 85% water.

Water acts very much like oil to an engine.

Many functions in our body require an adequate supply of water which:

  • carries oxygen and nutrients to cells throughout the body
  • flushes bacteria
  • aids in digestion
  • prevents constipation
  • helps normalize blood pressure
  • maintains a stable heartbeat
  • cushions joints
  • protects tissues and organs
  • regulates body temperature
  • maintains the body’s electrolyte and sodium levels
  • several studies suggest water aids in weight loss

As you can see we definitely depend on the water so be sure to grab a glass and drink up.

How does water affect diabetes?

The fact is dehydration and diabetes often go hand in hand.

Seriously though, diabetes occurs when the body either doesn’t produce enough insulin or can’t use that insulin effectively.

This creates extra sugar in the blood which causes the kidneys to work overtime trying to filter and absorb all that excess sugar.

According to the Mayo Clinic, your body expels sugar in the urine, which also drags fluids from your tissues.

This causes you to urinate more frequently which risks further dehydration.

It stands to reason that diabetics can significantly reduce their risk of dehydration by following their diabetes care plan as set forth by their diabetes team and managing those blood glucose levels to within or at least close to the target range.


Symptoms of dehydration

There are several symptoms of dehydration which includes:

  • thirst
  • headache
  • dry mouth and dry eyes
  • dizziness
  • tiredness
  • dark yellow colored urine

Sometimes dehydration can become severe and those symptoms include:

  • low blood pressure
  • sunken eyes
  • weak pulse/rapid heartbeat
  • confusion
  • lethargy

Treatment of dehydrationHow Does Dehydration Affect Diabetes - intravenous fluid intake

Dehydration is treated by consuming fluids. Water is best because it is sugar-free.

In cases of severe dehydration and medical treatment is required, electrolytes (salts) may be given with fluid intravenously to replace those lost through dehydration.

If dehydration is caused by hyperglycemia (high blood sugars), taking sugary drinks could compound the problem.

In some cases, depending on your specific treatment plan it may be possible to actively lower your blood glucose levels by taking additional insulin.

Naturally, this depends on whether your diabetes care team is comfortable with you doing this.

Dehydration can have serious consequences for diabetes because it drastically increases the chances of developing DKA, kidney failure, or a hyperosmolar hyperglycemic nonketotic state.

As you can see it is imperative for diabetics to not only drink enough water daily but to also follow their treatment plan to manage those blood sugar levels.

How much water should we drink to prevent dehydration?

There really is no concrete answer as to how much water we should drink each day.

Many factors determine our needs each day.

A good guideline would be to always have water available whenever you feel thirsty.How Does Dehydration Affect Diabetes - water bottle

There is no need to force yourself to drink a set amount of water.

Personally, I keep my water bottle with me at all times and sip water throughout the day which helps avoid getting that parched feeling when dehydration begins to set in.

It seems our thirst reflex isn’t always perfect, especially for diabetics, so drinking a little regularly can really help prevent dehydration.

Typically, the average non-diabetic person would drink 8 glasses per day so a diabetic should drink at least that, more if you are thirsty.

When you think about it 8-glasses are equivalent to about 2 Litres (approx. half a gallon) which really does sound like a lot. I use my 20-ounce water bottle and fill it 3 times throughout the day.

A few things that may make us require more water would be:

  • summer heat
  • working out (we lose a lot of water through sweat)
  • illness (we lose a lot of water through fever, vomiting, and diarrhea)

It is important to increase our fluid intake whenever we are ill, out in summer heat, or exercising.

Is there ever a reason to limit water intake?

Harvard research explains it is possible to take in too much water. This surprised me because I always thought if we drank too much water we would just urinate more to get rid of the excess.

Apparently, too much water in our system can be overtaxing for some of our systems if we have certain conditions or take certain medications. These would include:

  • kidney disease
  • thyroid disease
  • liver disease
  • take medications that cause water retention
  • non-steroidal anti-inflammatory drugs (NSAIDs)

If any of these applies to you, your doctor will advise you on how much water is appropriate for you to drink daily. Always follow your doctor’s recommendations.


So how does dehydration affect diabetes is a serious question with serious answers.

While dehydration can affect any of us at any time the consequences can be so much more severe for a diabetic.

The very nature of what diabetes is put diabetics at risk daily for developing dehydration.

It is important to be on the lookout for symptoms of dehydration which can include:

  • thirst
  • headache
  • dry mouth/dry eyes
  • dizziness
  • tiredness
  • dark yellow colored urine

Seek immediate medical assistance if symptoms of severe dehydration occur:

  • low blood pressure
  • sunken eyes
  • weak pulse/rapid heartbeat
  • confusion
  • lethargy

You can potentially avoid dehydration simply by sipping water regularly throughout the day and by following your diabetes care plan to manage blood sugar levels.

“I am not in any way a medical practitioner, please do not rely on the information on our website as an alternative to medical advice from your doctor or another healthcare provider. We only share our experiences.”

How much water do you drink in a day?

Do you keep a water bottle with you at all times?

Do you have any tips to share about how you avoid dehydration or manage your blood sugars each day?

Leave your suggestions in the comment section below.

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2 thoughts on “How Does Dehydration Affect Diabetes”

  1. Hi Deb. It’s interesting that your recommendation is to sip water all day. I believed that myself as well for a long time. But for recent years I have been subscribed to newsletters of Dutch experts on health. One is an orthomolecular doctor, the other a pharmacist.

    Their opinions differ very much from the usual heard ones. And one is that you shouldn’t sip water all day, but drink only a couple of times a day. A lot each time. Their recommendation still is an amount of 8 glasses a day, so it’s not the amount but the timing that is different.

    I like hearing opposing opinions about subjects. It forces me to realize what I actually believe myself and why. 🙂

    • Hi Hannie. The opinion of those Dutch experts is interesting. I know with Alex he would not be able to drink large amounts at one time. He is definitely a sipper and with food, he tends to be a grazer which makes managing his diabetes tricky. This is because his mealtime insulin dose depends on the number of carbs eaten. If he only lightly snacks at mealtime he is not getting enough insulin and it can create the need for bolus shots later. He is already at a minimum of 4 shots per day so we are really encouraging him to eat full meals and allow him to sip water. If his blood sugars are quite high, that is when we push the water. He hates that but we got to do what is necessary. It is a “pick your battles” kind of situation. Thanks for pointing out a differing opinion. I love constantly learning new things.


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