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Glucose Spikes: Is this something you need to consider?

As social media buzzes with conversations about glucose spikes and their potential health impacts, it's essential to delve into the science behind these claims. Here, we insight into glucose spikes, their causes, implications, and practical tips for maintaining stable blood glucose levels.

What Are Glucose Spikes?

A glucose spike occurs when blood sugar levels rise sharply and temporarily after eating. This phenomenon is a natural part of our body's metabolic response. When we consume carbohydrates—found in foods like bread, pasta, rice, and potatoes—our body breaks them down into glucose molecules, which enter the bloodstream. This surge in blood glucose prompts the pancreas to release insulin, a hormone that facilitates the use and storage of glucose for energy. It's a normal physiological response.

Which Foods Cause Glucose Spikes?

While protein, fat, and carbohydrates can all contribute to glucose spikes, carbohydrates have the most significant impact. The Glycemic Index (GI) is a useful tool for understanding how different carbohydrates affect blood sugar levels. Foods with a high GI (70 or above) cause rapid increases in blood glucose, while those with a low GI (55 or below) lead to slower, more gradual rises.

Examples of high GI foods:

  • Sugary foods and drinks (eg fruit juices)

  • White bread

  • White rice

Examples of low and medium GI foods:

  • Meat, chicken, fish, and eggs

  • Beans, peas, and lentils

  • Dairy (unflavoured/unsweetened)

  • Non-starchy vegetables like broccoli, spinach, cauliflower, eggplant

  • Most fruits

  • Oats

  • Pasta (white or wholemeal)

  • Basmati rice

However, focusing solely on GI can be misleading, as various factors influence blood glucose response:

  • Cooking methods

  • Ripeness of food

  • Food combinations and portion sizes

  • Individual genetics and physiology

  • Time of day

  • Health conditions like diabetes and PCOS

  • Meal patterns and overall diet quality

  • Sleep and stress levels

Adding foods rich in fibre, fat, and protein to high-GI foods can help moderate glucose spikes by slowing carbohydrate absorption.

Should You Worry About Glucose Spikes?

It's essential to recognise that glucose spikes are a normal physiological response, indicating that your body is effectively digesting and utilising carbohydrates for energy.

However, consistently high glucose spikes can be problematic, particularly for individuals with diabetes or insulin resistance. Prolonged high glucose levels can damage blood vessels and tissues, increasing the risk of complications affecting the eyes, heart, kidneys, and nerves. Symptoms of chronically high blood glucose levels include frequent urination, extreme thirst, fatigue, blurry vision, and unexplained weight loss. Conversely, low blood glucose levels can also pose significant health risks, leading to confusion, drowsiness, blurred vision, slurred speech, seizures, coma, or even death in severe cases. Again, this is most likely to occur in people with diabetes.

For those without diabetes, having an awareness of factors to maintain stable energy levels may be useful but unless you have a medical reason to do, there is no need to obsess over managing your glucose spikes. In fact, this practice could lead to unhealthy obsessions and disrupt relationship with food.

Practical Tips for Maintaining Stable Blood Glucose Levels

Maintaining stable blood glucose levels can support overall health and energy levels. Here are some practical tips:

  1. Eat Regularly: Avoid long gaps between meals. Aim to eat every 2-4 hours.

  2. Balance Your Meals: Ensure meals typically contain a mix of carbohydrates, protein, fibre, and fat.

  3. Pair Foods: Add protein, fiber, or fat to high-GI snacks to reduce glucose spikes. For example, spread peanut butter on white toast.

  4. Incorporate Movement: Regular physical activity helps regulate blood glucose levels.

  5. Manage Stress: Practice stress-reducing techniques such as mindfulness or yoga.

  6. Prioritise Sleep: Ensure you get adequate and quality sleep.

  7. Stay Hydrated: Drink plenty of water throughout the day.

  8. Consult Healthcare Providers: Regular medical check-ups are essential. Speak to your doctor if you have concerns about blood glucose levels.


While glucose spikes are a natural part of metabolism, managing them effectively can be crucial, especially for those with diabetes or insulin resistance. For others, a balanced diet, regular physical activity, stress management, and proper sleep can help maintain stable blood glucose levels. Always consult with healthcare professionals for personalised advice and recommendations.


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