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Why Is My Blood Sugar High? 8 Factors You Might Not Expect
18 Sep 2025 By John F. Sullivan, D.O.

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Why Is My Blood Sugar High? 8 Factors You Might Not Expect

High blood sugar, or hyperglycemia, can be concerning, especially for individuals with diabetes or pre-diabetes. While diet and exercise are often the first factors that come to mind when considering blood sugar control, several other surprising contributors can lead to elevated levels. This article delves into eight unexpected reasons why your blood sugar might be higher than normal.

Understanding Blood Sugar Basics

Before we dive into the less obvious reasons, let’s quickly recap the basics. Blood sugar refers to the concentration of glucose in your blood. Glucose is your body's primary energy source, derived from the food you eat. Insulin, a hormone produced by the pancreas, helps glucose enter your cells to be used for energy.

When you have insulin resistance (common in type 2 diabetes) or your body doesn't produce enough insulin (common in type 1 diabetes), glucose can build up in your bloodstream, leading to high blood sugar. Normal blood sugar levels typically range from 70-100 mg/dL before meals and less than 140 mg/dL two hours after meals. Anything consistently above these levels could indicate hyperglycemia.

8 Unexpected Factors Contributing to High Blood Sugar

Beyond diet and physical activity, several surprising factors can impact your blood sugar levels. Understanding these influences can empower you to better manage your health.

  1. Dehydration: When you’re dehydrated, your blood becomes more concentrated, which can lead to higher blood sugar readings. Dehydration also affects your kidneys, reducing their ability to flush out excess sugar.

    • The Fix: Aim to drink at least eight glasses of water per day and increase your fluid intake if you're exercising or in hot weather.
  2. Stress: When you're stressed, your body releases hormones like cortisol and adrenaline, which can raise blood sugar levels. This is because these hormones signal your liver to release stored glucose for extra energy, preparing you for "fight or flight." Surprising Factors Affecting Your A1C Blood Sugar Results

    • The Fix: Practice stress-reducing techniques such as meditation, deep breathing exercises, yoga, or spending time in nature.
  3. Certain Medications: Many medications, both prescription and over-the-counter, can impact blood sugar. These include steroids (like prednisone), diuretics, antidepressants, and some decongestants.

    • The Fix: Review your medication list with your doctor or pharmacist to identify any potential culprits. They may be able to adjust your dosage or suggest alternative medications.
  4. Sunburn: Believe it or not, sunburn can act as a stressor on your body. The inflammatory response triggered by a sunburn can lead to an increase in blood sugar levels. The 10 Best Foods To Help Stabilize Blood Sugar And Avoid Spikes

    • The Fix: Prevent sunburn by wearing protective clothing, using sunscreen with a high SPF, and limiting sun exposure during peak hours.
  5. Sleep Deprivation: Lack of sleep disrupts hormone balance, leading to increased cortisol and insulin resistance. This combination makes it harder for your body to regulate blood sugar effectively.

    • The Fix: Aim for 7-9 hours of quality sleep each night. Establish a consistent sleep schedule, create a relaxing bedtime routine, and ensure your bedroom is dark, quiet, and cool.
  6. Artificial Sweeteners: While marketed as sugar alternatives, some studies suggest that artificial sweeteners may negatively impact gut bacteria, leading to increased insulin resistance and potentially higher blood sugar levels over time.

    • The Fix: Use artificial sweeteners sparingly or opt for natural sweeteners like stevia or monk fruit in moderation. Pay attention to how your body responds to different sweeteners.
  7. Gum Disease: Gum disease (periodontitis) is linked to inflammation throughout the body. This inflammation can contribute to insulin resistance and make it harder to control blood sugar. The relationship works both ways: high blood sugar can also worsen gum disease. The 10 Minute Habit That Can Improve Your Blood Sugar All Day

    • The Fix: Practice good oral hygiene, including brushing twice daily, flossing regularly, and scheduling regular dental checkups.
  8. Skipping Meals: While it might seem counterintuitive, skipping meals can actually lead to higher blood sugar levels. When you skip a meal, your body may overcompensate by releasing stored glucose later on, leading to a spike.

    • The Fix: Eat regular, balanced meals throughout the day to help stabilize blood sugar levels. Include protein, healthy fats, and fiber-rich carbohydrates in each meal.

How To Monitor Blood Sugar Levels

Regularly monitoring your blood sugar levels is crucial for understanding how different factors affect you. This can be done with a home blood glucose meter or a continuous glucose monitor (CGM), as recommended by your doctor. Keep a log of your readings and any potential contributing factors to identify patterns and trends.

When to See a Doctor

If you consistently experience high blood sugar levels despite making lifestyle changes, it's essential to consult your healthcare provider. They can assess your overall health, perform necessary tests, and develop a personalized treatment plan that may include medication, lifestyle modifications, or referrals to specialists.

Key Metrics for Blood Sugar Management (HTML Table Example)

Tracking certain metrics is important for effectively managing blood sugar levels.

Metric Target Range Importance
Fasting Blood Sugar 70-100 mg/dL (non-diabetic) Indicates baseline glucose control.
Postprandial Blood Sugar (2 hours after meal) Less than 140 mg/dL (non-diabetic) Reflects how your body processes carbohydrates.
HbA1c (3-month average blood sugar) Less than 5.7% (non-diabetic) Provides a long-term view of blood sugar control.

Conclusion

Managing high blood sugar involves more than just diet and exercise. By understanding these less obvious factors – from dehydration and stress to sleep deprivation and gum disease – you can take proactive steps to optimize your blood sugar control and improve your overall health. Always consult with your healthcare provider for personalized advice and treatment. ```

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