Monday, 18 May 2026

Why do your sugar levels fluctuate more in summer?

From healthshots.com 

How does summer heat affect blood sugar levels? Effective tips for managing diabetes, staying hydrated, and nourishing your body

Summer can be difficult for everyone. When it comes to people with diabetes, increasing temperatures are of greater concern because they often notice unusual fluctuations in their blood sugars during summer. Even when they follow their regular diet and medication regimen, hot weather can affect the body in several ways. This includes changes in hydration levels, appetite, insulin action and daily routine. We need to understand the link between summer heat and diabetes to prevent sudden sugar spikes and dangerous drops.

                                                                                                 Image courtesy: Adobe Stock

Does heat affect blood sugar levels?

Dehydration is one of the main causes of changes in blood sugar levels in summer. Our bodies lose fluids and minerals through sweating. Dehydration makes blood glucose more concentrated, leading to higher blood sugar. “In addition, insulin absorption from injection sites may also be high during summer, leading to unexpected low blood sugar episodes in some individuals”, Diabetologist Dr Ranjit Unnikrishnan tells Health Shots. So, managing diabetes during summer can be difficult. People with diabetes find it harder to do physical activity and follow their health routines, as they may feel tired due to extreme heat. This leads to an increase in blood sugar.

Dehydration and blood sugar levels

Dehydration and blood sugar are closely linked. Our kidneys have difficulty removing excess sugar from the blood through urine because the body does not have enough water to carry the glucose. This can increase the risk of high blood sugar in summer. Common signs of dehydration include:

  • Excessive thirst
  • Dry mouth
  • Dizziness
  • Headache
  • Fatigue
  • Dark-coloured urine

Ignoring dehydration may lead to severe complications, especially in older adults and individuals with uncontrolled diabetes.

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