What Causes Diabetes?
Medically Reviewed By
Dr. Jacqueline P – General Practitioner
| Last Updated On: June 8, 2026
What Causes Diabetes? Risk Factors and Prevention Strategies Explained
Key Takeaways
- Diabetes develops when the body cannot produce enough insulin, cannot use insulin effectively, or both.
- The causes of diabetes vary depending on the type of diabetes.
- Genetics, lifestyle factors, and certain health conditions may influence diabetes risk.
- Some risk factors cannot be changed, while others may be manageable.
- Understanding risk factors may help support informed healthcare decisions.
Quick Answer: What Causes Diabetes?
Diabetes develops when the body is unable to properly regulate blood sugar levels. This may occur because the body does not produce enough insulin, cannot use insulin effectively, or both. The underlying causes vary depending on whether a person has type 1 diabetes, type 2 diabetes, or gestational diabetes.
Understanding How Diabetes Develops
To understand what causes diabetes, it helps to know how the body normally processes glucose.
Glucose is a type of sugar that comes from food and serves as a major source of energy for the body's cells. After eating, glucose enters the bloodstream.
The pancreas produces a hormone called insulin. Insulin helps move glucose from the bloodstream into cells where it can be used for energy.
When insulin production is reduced or the body cannot respond properly to insulin, glucose can build up in the bloodstream. Over time, elevated blood sugar levels may lead to diabetes and increase the risk of complications.
Causes of Type 1 Diabetes
Type 1 diabetes is considered an autoimmune condition.
In people with type 1 diabetes, the immune system mistakenly attacks insulin-producing beta cells in the pancreas. As more of these cells are damaged, the body's ability to produce insulin decreases.
Eventually, insulin production may become insufficient to maintain normal blood sugar levels.
Genetic Factors
Researchers believe genetics may play a role in the development of type 1 diabetes.
Having a family member with type 1 diabetes may increase the likelihood of developing the condition, although many individuals diagnosed with type 1 diabetes have no known family history.
Environmental Factors
Scientists continue to study environmental factors that may contribute to type 1 diabetes development.
Potential factors being investigated include:
- Viral infections
- Environmental exposures
- Immune system responses
The exact cause of type 1 diabetes remains an area of ongoing research.
Causes of Type 2 Diabetes
Type 2 diabetes is the most common form of diabetes.
Unlike type 1 diabetes, type 2 diabetes usually develops gradually over time.
Two major processes contribute to type 2 diabetes:
Insulin Resistance
Insulin resistance occurs when the body's cells become less responsive to insulin.
Even though insulin may still be present, the body's cells do not use it as effectively.
As a result, glucose remains in the bloodstream instead of moving efficiently into cells.
Reduced Insulin Production
Over time, the pancreas may struggle to keep up with the body's increased demand for insulin.
When insulin production can no longer compensate for insulin resistance, blood sugar levels may rise.
Common Risk Factors for Type 2 Diabetes
Several factors may increase the likelihood of developing type 2 diabetes.
Family History
A family history of diabetes may increase risk.
People who have a parent or sibling with type 2 diabetes may be more likely to develop the condition themselves.
Excess Body Weight
Excess body weight, particularly around the abdomen, is associated with an increased risk of insulin resistance.
Not everyone with excess body weight develops diabetes, and some people with diabetes have weights considered healthy for their height.
Physical Inactivity
Regular movement helps the body use insulin more effectively.
A sedentary lifestyle may contribute to insulin resistance over time.
Increasing Age
The risk of type 2 diabetes generally increases with age.
However, type 2 diabetes can occur in younger adults and children as well.
High Blood Pressure
High blood pressure is frequently discussed alongside diabetes because both conditions may share similar risk factors.
Abnormal Cholesterol Levels
Certain cholesterol patterns may be associated with an increased risk of type 2 diabetes and cardiovascular disease.
History of Gestational Diabetes
Individuals who develop gestational diabetes during pregnancy may have a higher likelihood of developing type 2 diabetes later in life.
Polycystic Ovary Syndrome (PCOS)
PCOS is associated with insulin resistance and may increase the risk of developing type 2 diabetes.
What Causes Gestational Diabetes?
Gestational diabetes develops during pregnancy.
Hormonal changes that occur during pregnancy may affect how the body uses insulin.
In some individuals, insulin production may not be sufficient to meet the body's increased needs during pregnancy.
This can lead to elevated blood sugar levels.
Gestational diabetes often improves after delivery, but ongoing monitoring may be recommended because future diabetes risk may remain elevated.
What Is Prediabetes?
Prediabetes is a condition in which blood sugar levels are higher than normal but not high enough for a diabetes diagnosis.
Many individuals with prediabetes experience no noticeable symptoms.
Without intervention, some people with prediabetes may eventually develop type 2 diabetes.
Prediabetes can provide an opportunity to identify risk factors and discuss prevention strategies with a healthcare professional.
Can Diabetes Be Prevented?
Not all forms of diabetes can be prevented.
For example, there is currently no known way to prevent type 1 diabetes.
However, some lifestyle habits may help support overall health and may reduce the risk of developing type 2 diabetes in certain individuals.
Healthy Eating Habits
Balanced eating patterns that emphasize nutrient-dense foods may support long-term health.
Examples include:
- Vegetables
- Fruits
- Whole grains
- Lean protein sources
- Healthy fats
Regular Physical Activity
Physical activity may help improve insulin sensitivity and support healthy blood sugar regulation.
Examples include:
- Walking
- Cycling
- Swimming
- Strength training
Weight Management
For some individuals, maintaining a healthy weight may support metabolic health and reduce certain diabetes risk factors.
Routine Healthcare Visits
Regular checkups may help identify changes in blood sugar levels before symptoms become noticeable.
Related Conditions
Diabetes often occurs alongside other health conditions and risk factors.
Related conditions may include:
- Prediabetes
- High Blood Pressure
- High Cholesterol
- Obesity
- Metabolic Syndrome
- Cardiovascular Disease
Understanding these relationships may help individuals gain a broader picture of overall health.
When to Speak With a Healthcare Professional
Consider speaking with a healthcare professional if:
- You have a family history of diabetes.
- You have concerns about diabetes risk factors.
- You experience symptoms such as increased thirst or frequent urination.
- You have previously been told you have elevated blood sugar levels.
A healthcare professional can recommend appropriate testing and discuss individual risk factors.
Learn More About Diabetes
Continue exploring these resources:
- Complete Guide to Diabetes
- Diabetes Symptoms: Early Signs and Warning Symptoms
- How Diabetes Is Diagnosed: Blood Sugar Tests and A1C
- Living With Diabetes: Diet, Exercise, Monitoring, and Daily Management Tips
- Diabetes Medications
Frequently Asked Questions
What is the main cause of diabetes?
The causes of diabetes vary by type. Diabetes may develop when the body does not produce enough insulin, cannot use insulin effectively, or both.
Is diabetes hereditary?
Genetics may influence diabetes risk, although environmental and lifestyle factors can also play important roles.
Can type 2 diabetes develop without symptoms?
Yes. Many people with type 2 diabetes experience few or no symptoms in the early stages.
Does being overweight always cause diabetes?
No. While excess body weight may increase risk, not everyone with excess body weight develops diabetes, and not all people with diabetes are overweight.
What is insulin resistance?
Insulin resistance occurs when the body's cells become less responsive to insulin, making it harder for glucose to enter cells efficiently.
Can physical activity affect diabetes risk?
Regular physical activity may support healthy blood sugar regulation and overall metabolic health.
What is prediabetes?
Prediabetes occurs when blood sugar levels are higher than normal but not high enough to meet the criteria for diabetes.
Can gestational diabetes increase future risk?
Individuals who develop gestational diabetes may have an increased likelihood of developing type 2 diabetes later in life.
Our Editorial Process
This content is created using evidence-based medical sources and reviewed for accuracy before publication. Our goal is to provide balanced, trustworthy, and easy-to-understand health information.
Medical Disclaimer
This content is intended for educational purposes only and should not be considered medical advice, diagnosis, or treatment. Individuals should consult a qualified healthcare professional regarding personal health concerns and healthcare decisions.
References
- Centers for Disease Control and Prevention (CDC)
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
- American Diabetes Association (ADA)
- MedlinePlus
- National Institutes of Health (NIH)
Editorial Standards
Content published on Global Discount Drugs is reviewed by healthcare professionals and supported by credible medical sources. Read our Editorial Content Policy to learn more.
Kevin P draws on 10+ years of health expertise to share actionable wellness tips. He focuses on making health achievable for everyone.
Medically Reviewed By
Dr. Jacqueline P – General Practitioner | Last Updated On: June 8, 2026
What Causes Diabetes? Risk Factors and Prevention Strategies Explained
Key Takeaways
- Diabetes develops when the body cannot produce enough insulin, cannot use insulin effectively, or both.
- The causes of diabetes vary depending on the type of diabetes.
- Genetics, lifestyle factors, and certain health conditions may influence diabetes risk.
- Some risk factors cannot be changed, while others may be manageable.
- Understanding risk factors may help support informed healthcare decisions.
Quick Answer: What Causes Diabetes?
Diabetes develops when the body is unable to properly regulate blood sugar levels. This may occur because the body does not produce enough insulin, cannot use insulin effectively, or both. The underlying causes vary depending on whether a person has type 1 diabetes, type 2 diabetes, or gestational diabetes.Understanding How Diabetes Develops
To understand what causes diabetes, it helps to know how the body normally processes glucose. Glucose is a type of sugar that comes from food and serves as a major source of energy for the body's cells. After eating, glucose enters the bloodstream. The pancreas produces a hormone called insulin. Insulin helps move glucose from the bloodstream into cells where it can be used for energy. When insulin production is reduced or the body cannot respond properly to insulin, glucose can build up in the bloodstream. Over time, elevated blood sugar levels may lead to diabetes and increase the risk of complications.Causes of Type 1 Diabetes
Type 1 diabetes is considered an autoimmune condition. In people with type 1 diabetes, the immune system mistakenly attacks insulin-producing beta cells in the pancreas. As more of these cells are damaged, the body's ability to produce insulin decreases. Eventually, insulin production may become insufficient to maintain normal blood sugar levels.Genetic Factors
Researchers believe genetics may play a role in the development of type 1 diabetes. Having a family member with type 1 diabetes may increase the likelihood of developing the condition, although many individuals diagnosed with type 1 diabetes have no known family history.Environmental Factors
Scientists continue to study environmental factors that may contribute to type 1 diabetes development. Potential factors being investigated include:- Viral infections
- Environmental exposures
- Immune system responses
Causes of Type 2 Diabetes
Type 2 diabetes is the most common form of diabetes. Unlike type 1 diabetes, type 2 diabetes usually develops gradually over time. Two major processes contribute to type 2 diabetes:Insulin Resistance
Insulin resistance occurs when the body's cells become less responsive to insulin. Even though insulin may still be present, the body's cells do not use it as effectively. As a result, glucose remains in the bloodstream instead of moving efficiently into cells.Reduced Insulin Production
Over time, the pancreas may struggle to keep up with the body's increased demand for insulin. When insulin production can no longer compensate for insulin resistance, blood sugar levels may rise.Common Risk Factors for Type 2 Diabetes
Several factors may increase the likelihood of developing type 2 diabetes.Family History
A family history of diabetes may increase risk. People who have a parent or sibling with type 2 diabetes may be more likely to develop the condition themselves.Excess Body Weight
Excess body weight, particularly around the abdomen, is associated with an increased risk of insulin resistance. Not everyone with excess body weight develops diabetes, and some people with diabetes have weights considered healthy for their height.Physical Inactivity
Regular movement helps the body use insulin more effectively. A sedentary lifestyle may contribute to insulin resistance over time.Increasing Age
The risk of type 2 diabetes generally increases with age. However, type 2 diabetes can occur in younger adults and children as well.High Blood Pressure
High blood pressure is frequently discussed alongside diabetes because both conditions may share similar risk factors.Abnormal Cholesterol Levels
Certain cholesterol patterns may be associated with an increased risk of type 2 diabetes and cardiovascular disease.History of Gestational Diabetes
Individuals who develop gestational diabetes during pregnancy may have a higher likelihood of developing type 2 diabetes later in life.Polycystic Ovary Syndrome (PCOS)
PCOS is associated with insulin resistance and may increase the risk of developing type 2 diabetes.What Causes Gestational Diabetes?
Gestational diabetes develops during pregnancy. Hormonal changes that occur during pregnancy may affect how the body uses insulin. In some individuals, insulin production may not be sufficient to meet the body's increased needs during pregnancy. This can lead to elevated blood sugar levels. Gestational diabetes often improves after delivery, but ongoing monitoring may be recommended because future diabetes risk may remain elevated.What Is Prediabetes?
Prediabetes is a condition in which blood sugar levels are higher than normal but not high enough for a diabetes diagnosis. Many individuals with prediabetes experience no noticeable symptoms. Without intervention, some people with prediabetes may eventually develop type 2 diabetes. Prediabetes can provide an opportunity to identify risk factors and discuss prevention strategies with a healthcare professional.Can Diabetes Be Prevented?
Not all forms of diabetes can be prevented. For example, there is currently no known way to prevent type 1 diabetes. However, some lifestyle habits may help support overall health and may reduce the risk of developing type 2 diabetes in certain individuals.Healthy Eating Habits
Balanced eating patterns that emphasize nutrient-dense foods may support long-term health. Examples include:- Vegetables
- Fruits
- Whole grains
- Lean protein sources
- Healthy fats
Regular Physical Activity
Physical activity may help improve insulin sensitivity and support healthy blood sugar regulation. Examples include:- Walking
- Cycling
- Swimming
- Strength training
Weight Management
For some individuals, maintaining a healthy weight may support metabolic health and reduce certain diabetes risk factors.Routine Healthcare Visits
Regular checkups may help identify changes in blood sugar levels before symptoms become noticeable.Related Conditions
Diabetes often occurs alongside other health conditions and risk factors. Related conditions may include:- Prediabetes
- High Blood Pressure
- High Cholesterol
- Obesity
- Metabolic Syndrome
- Cardiovascular Disease
When to Speak With a Healthcare Professional
Consider speaking with a healthcare professional if:- You have a family history of diabetes.
- You have concerns about diabetes risk factors.
- You experience symptoms such as increased thirst or frequent urination.
- You have previously been told you have elevated blood sugar levels.
- Complete Guide to Diabetes
- Diabetes Symptoms: Early Signs and Warning Symptoms
- How Diabetes Is Diagnosed: Blood Sugar Tests and A1C
- Living With Diabetes: Diet, Exercise, Monitoring, and Daily Management Tips
- Diabetes Medications
Frequently Asked Questions
What is the main cause of diabetes?
The causes of diabetes vary by type. Diabetes may develop when the body does not produce enough insulin, cannot use insulin effectively, or both.Is diabetes hereditary?
Genetics may influence diabetes risk, although environmental and lifestyle factors can also play important roles.Can type 2 diabetes develop without symptoms?
Yes. Many people with type 2 diabetes experience few or no symptoms in the early stages.Does being overweight always cause diabetes?
No. While excess body weight may increase risk, not everyone with excess body weight develops diabetes, and not all people with diabetes are overweight.What is insulin resistance?
Insulin resistance occurs when the body's cells become less responsive to insulin, making it harder for glucose to enter cells efficiently.Can physical activity affect diabetes risk?
Regular physical activity may support healthy blood sugar regulation and overall metabolic health.What is prediabetes?
Prediabetes occurs when blood sugar levels are higher than normal but not high enough to meet the criteria for diabetes.Can gestational diabetes increase future risk?
Individuals who develop gestational diabetes may have an increased likelihood of developing type 2 diabetes later in life. Our Editorial Process This content is created using evidence-based medical sources and reviewed for accuracy before publication. Our goal is to provide balanced, trustworthy, and easy-to-understand health information. Medical Disclaimer This content is intended for educational purposes only and should not be considered medical advice, diagnosis, or treatment. Individuals should consult a qualified healthcare professional regarding personal health concerns and healthcare decisions. References- Centers for Disease Control and Prevention (CDC)
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
- American Diabetes Association (ADA)
- MedlinePlus
- National Institutes of Health (NIH)
Editorial Standards
Content published on Global Discount Drugs is reviewed by healthcare professionals and supported by credible medical sources. Read our Editorial Content Policy to learn more.
Kevin P draws on 10+ years of health expertise to share actionable wellness tips. He focuses on making health achievable for everyone.
