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Managing Diabetes and Insulin in Hot Weather

Kas Andz 07.02.2024

We’re experiencing some really hot weather in the UK this summer, and for diabetics this can make managing blood sugar levels particularly tricky.

While lots of people are enjoying the warm sunshine, many diabetics will need to change their approach to controlling their glucose levels and how they store insulin when the temperature starts to rise. 

Thankfully there’s some great advice from charities like Diabetes UK and Diabetes Org UK and with careful management anyone who suffers from Diabetes can, in fact, safely enjoy the heat and the sun this summer.

Why the heat affects blood sugar levels

There are actually several ways that heat can adversely affect blood sugar levels, insulin needs and even the vials of insulin themselves.

Heat: Whether it’s dry or humid, heat can quickly impact your hydration levels and cause your glucose levels to spike rapidly. Dehydration creates a situation where there is less fluid in your tissue and bloodstream, and therefore the glucose levels in the blood become more concentrated.

While activity is often associated with a change in sugar levels, just sitting still in the sun when it’s hot will cause a significant rise in blood sugar levels.

Sun Exposure: Sunburn, in particular, is incredibly stressful to the body. Sunburn is essentially a cellular inflammation which the body reacts to by producing more hormones, including cortisol, to manage and heal it. This can cause a spike in sugar levels and even temporary resistance to insulin for several days before it settles down.

How heat affects insulin intake

Heat affects both the effect of insulin in your body and the efficacy of the product while it’s in the vial.

If you take insulin to treat your diabetes, be aware that it will be absorbed more quickly from injection in warmer weather, which can increase the risk of hypos. Keeping hydrated is one way of maintaining good glucose levels and you should always seek help/guidance from your GP/specialist on management of your insulin levels during the heat.

How heat affects insulin vials

Put simply, insulin vials that are exposed to heat above an average room temperature will die. The vials don’t even need to be in heat for long before they start to break down. Just one hour in 25 degrees celsius will cause the insulin to become ineffective.

Once the vials become warm they no longer provide the amount of insulin stated on the label and will leave you vulnerable and unsure of the levels you’ve administered into your body. If your vial looks cloudy, discoloured, has visible particles or you think it’s been overexposed to heat you should throw it away. It will almost definitely have lost its effectiveness and won’t keep your blood sugars from getting too high.

Therefore, it's absolutely paramount that you store your insulin at a steady, cool temperature to ensure it’s effective when you need it.

How to store insulin in hot weather

The ideal temperature to store your insulin vials, pens, and pumps is between 2 and 6 degrees celsius. Storing them in the fridge is ideal.

Never leave your insulin in the car or in a bag that’s next to a radiator or sitting in the heat. Within just 60 minutes the insulin will be ineffective.

Even wearing your pump too close to your body on a hot day or while you’re exercising can cause the insulin to deteriorate quite rapidly.

So, if you must leave your insulin in your bag or even in your car because you’re out and about or travelling, then you’ll need a good insulin storage solution to keep your medication at the right temperature.

Use an insulin cool bag or an ice pack cooler to protect it. If you already have an insulin or EpiPen storage/travel you should consider keeping it in a cool box with a cool ice pack inside.

Metres and Test Strips

Don’t forget to keep your blood glucose metre and glucose test strips away from the sun and heat as well. Extreme temperatures can also affect their efficacy so store them as close to normal room temperature as possible, and always keep them out of direct sunlight. 

Unfortunately they cannot be refrigerated, as extreme temperatures will lead to misleading results.

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We have over 40 years experience in medical, surgical, mobility and home health supplies and we're always on hand to chat if you need support or advice and don't forget to read our other great health blogs!

 

August 2022

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