What Affects Blood Sugar? Why It's About More Than Just Sugar

When we think about blood sugar, our minds often go straight to sugar and carbohydrates. And while what we eat plays a significant role in how our bodies regulate blood glucose, it's only part of the picture.

Our blood sugar levels are also influenced by how much we move, how well we sleep, our stress levels and even our individual biology.

The good news? Many of these factors are within our control.

In recognition of Diabetes Awareness Month, we're exploring the foundations of healthy blood sugar regulation, why people can respond differently to the same foods and how understanding your genetics and gut microbiome may offer additional insights into your metabolic health.

What Is Blood Sugar, and Why Does It Matter?

Blood sugar, also called blood glucose, is the amount of glucose circulating in your bloodstream. Glucose is an important source of energy for your body's cells, particularly your brain and muscles.

When you eat carbohydrates, your digestive system breaks many of them down into glucose, which enters your bloodstream.

Your pancreas responds by releasing insulin, a hormone that helps glucose move from your blood into your cells, where it can be used for energy or stored for later.

In a healthy metabolic system, your body continually adjusts insulin and other hormones to keep blood glucose within an appropriate range.

But when cells become less responsive to insulin, a condition known as insulin resistance, the body may need to produce more insulin to manage blood glucose.

Over time, insulin resistance can contribute to elevated blood sugar and increase the risk of developing type 2 diabetes.

Understanding what influences this process is an important part of supporting long-term metabolic health.

1. Nutrition: The Foundation of Healthy Blood Sugar

Let's start with one of the most important factors: what you eat.

Nutrition plays a central role in blood sugar regulation because the type, quantity and combination of foods you consume influence how quickly glucose enters your bloodstream.

But supporting healthy blood sugar doesn't mean eliminating carbohydrates. It's about choosing nutrient-dense foods and building balanced meals.

Focus on Fibre-Rich Carbohydrates

Not all carbohydrates affect blood sugar in the same way.

Foods such as lentils, beans, oats, vegetables, berries and minimally processed whole grains provide fibre, which can slow carbohydrate digestion and glucose absorption.

Fibre also supports digestive health and helps nourish beneficial gut bacteria.

Include Protein and Healthy Fats

Combining carbohydrates with protein, fibre and healthy fats can help moderate the blood glucose response to a meal.

For example, compare eating a slice of white toast on its own with enjoying whole-grain toast alongside eggs and avocado.

The second meal provides protein, fibre and healthy fats, creating a more balanced nutritional profile.

Think About Your Overall Dietary Pattern

Research consistently supports dietary patterns rich in vegetables, legumes, whole grains, nuts, seeds and unsaturated fats for metabolic health.

A Mediterranean-style eating pattern is one well-studied example.

The takeaway: Healthy blood sugar starts with consistent, balanced nutrition. Small choices made regularly can have a meaningful impact over time.

2. Movement: Your Muscles Help Regulate Blood Sugar

Physical activity is another powerful tool for supporting healthy blood sugar.

When your muscles contract during movement, they can take up glucose from your bloodstream and use it for energy. This process can occur even without requiring the same degree of insulin action.

Regular physical activity can also improve insulin sensitivity, meaning your cells become more responsive to insulin.

And you don't necessarily need an intense workout to benefit.

Walking after meals, cycling, swimming, resistance training and simply breaking up long periods of sitting can all contribute to better metabolic health.

Resistance training is particularly valuable because muscle tissue plays an important role in glucose storage and utilization.

Try this: A short walk after lunch or dinner is a simple way to incorporate more movement into your day.

3. Sleep: An Often-Overlooked Part of Metabolic Health

Have you ever noticed that after a poor night's sleep, you feel hungrier or crave more carbohydrate-rich foods?

Sleep influences several processes involved in metabolism, including appetite regulation and insulin sensitivity.

Research has shown that insufficient or disrupted sleep can reduce the body's ability to respond effectively to insulin.

Over time, consistently poor sleep is associated with an increased risk of type 2 diabetes.

Supporting better sleep may involve:

• Maintaining a consistent sleep and wake schedule

• Creating a cool, dark sleeping environment

• Limiting caffeine later in the day

• Getting regular physical activity

• Establishing a relaxing bedtime routine

Sleep isn't simply a time for rest. It's an essential part of metabolic regulation.

4. Stress: The Connection Between Cortisol and Blood Sugar

Stress affects more than your mental wellbeing.

When you experience stress, your body releases hormones such as cortisol and adrenaline. These hormones help prepare your body to respond to a perceived challenge.

One way they do this is by increasing the availability of glucose in your bloodstream.

This response is useful in the short term, particularly when your body needs additional energy.

However, ongoing stress and prolonged activation of stress-related pathways can make blood sugar regulation more challenging, particularly for people already experiencing insulin resistance.

Stress management doesn't have to be complicated.

Regular movement, time outdoors, breathing exercises, social connection and adequate sleep can all support a healthier stress response.

The takeaway: Managing stress isn't just about feeling calmer. It's also an important part of supporting overall metabolic health.

5. Genetics: Why Your Biology Matters

Even when two people follow similar diets and exercise routines, their metabolic responses may not be identical.

One reason is genetics.

Certain genetic variations have been associated with differences in glucose metabolism, insulin secretion, insulin sensitivity and susceptibility to type 2 diabetes.

For example, researchers have identified variants in genes such as TCF7L2 that are associated with type 2 diabetes risk.

However, these associations don't mean that a particular genetic variation determines whether someone will develop diabetes.

Metabolic health is influenced by the interaction of many genes, lifestyle behaviours and environmental factors.

How Can DNA Wellness Testing Add Insight?

A DNA wellness test such as totalPower by dnaPower explores genetic tendencies associated with nutrition, metabolism and other aspects of wellness.

These insights can help provide additional context about your individual biology and inform conversations about personalized nutrition and lifestyle choices.

Importantly, DNA wellness testing does not measure your current blood glucose, diagnose insulin resistance or determine whether you have diabetes.

Instead, it offers another perspective on the biological factors that may influence your health.

Your genetics may influence your tendencies, but your daily habits remain an essential part of the picture.

6. Your Gut Microbiome: Another Piece of the Metabolic Puzzle

Your gut is home to trillions of microorganisms, collectively known as the gut microbiome.

These microorganisms participate in a wide range of biological processes, including digestion, fibre fermentation and the production of compounds that interact with metabolic pathways.

One particularly interesting area of research is the relationship between the gut microbiome and blood sugar regulation.

Can Gut Bacteria Influence Blood Sugar?

Research suggests that differences in gut microbial composition may contribute to variations in how individuals respond to food.

In a landmark 2015 study published in Cell, researchers monitored blood glucose responses to thousands of meals and found considerable differences between individuals, even when they consumed identical foods.

The researchers also found that combining information about the gut microbiome with dietary, clinical and lifestyle factors helped predict individual glucose responses.

These findings highlight the complexity of metabolic health and the potential value of personalized approaches to nutrition.

However, research in this area is still evolving. Microbiome testing alone cannot reliably predict an individual's blood sugar response or diagnose metabolic disease.

How Can Gut Microbiome Testing Add Insight?

MapmyBiome by dnaPower uses advanced shotgun metagenomic sequencing to explore the microorganisms and functional pathways within your gut microbiome.

It provides information about microbial diversity, composition and nutrition-related microbial functions, along with personalized dietary recommendations.

These insights can complement established nutrition and lifestyle strategies by helping you better understand your gut microbial environment.

7. Five Everyday Habits That Support Healthy Blood Sugar

You don't need to overhaul your entire lifestyle to start supporting better metabolic health.

Consider these five foundational habits:

1. Build balanced meals. Include fibre-rich carbohydrates, vegetables, protein and healthy fats.

2. Move your body regularly. Incorporate walking, resistance training and activities you enjoy.

3. Prioritize quality sleep. Aim for consistent, restorative sleep and address persistent sleep difficulties.

4. Manage daily stress. Make time for activities that support relaxation and recovery.

5. Know your numbers. Discuss appropriate blood glucose or HbA1c screening with your healthcare provider, particularly if you have risk factors for type 2 diabetes.

The goal isn't perfection. It's building sustainable habits that support your health over time.

Why Personalized Health Matters

We all share the same basic foundations of metabolic health: nutritious food, regular movement, adequate sleep and effective stress management.

But our individual biology can influence how we respond to these habits.

Genetics can contribute to differences in metabolic tendencies, while the gut microbiome interacts with our diet and environment in ways researchers are continuing to explore.

Understanding these differences may help provide a more complete picture of your health.

At dnaPower, we believe personalized health information can complement the everyday habits and clinical care that support long-term wellbeing.

Our totalPower DNA Wellness Test and MapmyBiome Gut Microbiome Test offer different perspectives on your biology, helping you explore factors related to nutrition, metabolism and gut health.

Because while the foundations of good health are universal, our individual biology is unique.

Explore Precision Health Testing at dnaPower.com.

Frequently Asked Questions

What causes blood sugar to rise besides eating sugar?

Blood sugar can be influenced by several factors beyond food, including stress hormones, inadequate sleep, illness, medications, physical inactivity and underlying insulin resistance. Even the time of day can influence glucose regulation.

Can eating healthy foods still raise blood sugar?

Yes. Foods containing digestible carbohydrates naturally raise blood glucose as they are broken down and absorbed. This is a normal physiological process. The size and duration of the response depend on factors such as portion size, food composition and individual metabolic health.

Can genetics affect blood sugar regulation?

Yes. Genetic variations can influence processes related to insulin secretion, glucose metabolism and type 2 diabetes susceptibility. However, genetics is only one part of metabolic health, and lifestyle and environmental factors remain important.

Does the gut microbiome affect blood sugar?

Research suggests that gut microbial composition and function may contribute to glucose metabolism and individual responses to food. However, scientists are still investigating these relationships, and microbiome testing is not currently an established diagnostic tool for blood sugar disorders.

Can walking after meals help regulate blood sugar?

Yes. Walking after meals encourages muscles to use glucose and may help reduce post-meal blood sugar elevations. Even short periods of movement can be beneficial.

How do I know if my blood sugar is healthy?

Blood glucose and HbA1c blood tests are established methods used to assess glucose regulation and screen for diabetes or prediabetes. A healthcare professional can help determine whether testing is appropriate based on your age, health history and risk factors.

References

1. American Diabetes Association Professional Practice Committee. (2026). Facilitating Positive Health Behaviors and Well-being to Improve Health Outcomes: Standards of Care in Diabetes—2026. Diabetes Care, 49(Suppl. 1). https://doi.org/10.2337/dc26-S005

2. American Diabetes Association Professional Practice Committee. (2026). Diagnosis and Classification of Diabetes: Standards of Care in Diabetes—2026. Diabetes Care, 49(Suppl. 1). https://doi.org/10.2337/dc26-S002

3. Zeevi, D., et al. (2015). Personalized Nutrition by Prediction of Glycemic Responses. Cell, 163(5), 1079–1094. https://doi.org/10.1016/j.cell.2015.11.001

4. American Diabetes Association. Understanding Blood Glucose and Exercise. https://diabetes.org/health-wellness/fitness/blood-glucose-and-exercise

5. Centers for Disease Control and Prevention. (2026). 10 Surprising Things That Can Spike Your Blood Sugar. https://www.cdc.gov/diabetes/living-with/10-things-that-spike-blood-sugar.html

This article is for educational purposes and is not intended to diagnose, prevent or treat diabetes. If you have concerns about blood glucose or metabolic health, consult a qualified healthcare professional.