Diabetes and Dementia: What the Latest Research Reveals About the Connection

Research demonstrating how long-term blood sugar abnormalities might affect brain health is drawing more attention to the connection between diabetes and dementia. Insulin resistance, hyperglycemia, and neuroinflammation are some of the factors that increase the risk of type 2 diabetes and dementia, contributing to cognitive impairment.

Many people ask if diabetes causes dementia, and although researchers are still studying the answer, evidence clearly shows a strong connection.

In this article, we explore diabetes cognitive decline, including its link to vascular dementia and Alzheimer’s disease, key mechanisms affecting brain insulin signaling, early warning signs like blood sugar and memory loss, and practical strategies for preventing dementia with diabetes through better lifestyle and glucose management.

Read More: Palliative Care for Dementia Patients: What It Is, When to Start, and How It Helps

Is There a Link Between Diabetes and Dementia?

The hormone insulin regulates blood sugar levels; insufficient insulin production or improper response to insulin can cause diabetes and raise blood sugar levels. Diabetes comes in two varieties:

• People can acquire type 1 diabetes at any age, but it is typically diagnosed in childhood when the body’s immune cells mistakenly target the cells that produce insulin.
• People acquire type 2 diabetes, a condition known as insulin resistance, when the body produces less insulin or when cells do not respond to the insulin as they should.

Compared to persons without diabetes, those having type 2 diabetes in their midlife are more likely to acquire dementia, especially vascular dementia. A person’s risk of dementia also rises with the duration and severity of their diabetes. It’s crucial to remember, though, that diabetes is merely a risk factor and does not guarantee that a person will eventually acquire dementia.

Among those who have type 1 diabetes. Severe blood sugar fluctuations are also linked to a higher chance of dementia.

Types of Dementia Linked to Diabetes

Alzheimer’s Disease

Research indicates an increased risk of diabetes and Alzheimer’s, potentially as a result of amyloid protein buildup and compromised brain insulin signaling. Because of this, some experts have dubbed Alzheimer’s “Type 3 diabetes.”

Vascular Dementia

Diabetes and vascular dementia are closely related because of microvascular damage to the brain’s blood vessels. Chronic high blood sugar and cognitive decline can reduce oxygen supply to brain tissue.

Mixed Dementia

Diabetes cognitive decline is a complex illness influenced by both metabolic and vascular problems, as many people have both Alzheimer’s and vascular dementia, known as mixed dementia.

How Diabetes May Affect Brain Health

The command center of your body is your brain. Your brain uses blood sugar as an energy source to carry out all of its functions. The brain actually requires the most energy of any organ. For proper operation, it requires half of the body’s energy from sugar.

Your command center may become unbalanced if your blood sugar levels deviate from your usual levels. Diabetes can harm nerves in your brain just like it can harm nerves in other areas of your body.

Memory and learning issues, mood swings, weight gain, and hormonal abnormalities can result from this. Alzheimer’s disease and other major issues may eventually result from it. For this reason, maintaining target blood sugar levels is crucial for those who have diabetes.

Your physician will establish a personal blood sugar goal range. Maintaining blood sugar levels near your target can help protect your brain. Consume a diet that is high in fruit, vegetables, and fiber, and make time for regular exercise. You can maintain your brain health and control your diabetes by adopting these healthy practices.

Read More: Brain Habits That Lower Your Dementia Risk After 40

How Much Does Diabetes Increase Dementia Risk?

Diabetes, a class of long-term metabolic diseases, is characterized by high blood glucose levels. It is an extremely complicated illness with several risk factors and causes. Alzheimer’s disease causes fifty to seventy-five percent of dementia cases.

Vascular dementia, dementia with Lewy bodies (abnormal protein deposits inside nerve cells), and a collection of illnesses that contribute to frontotemporal dementia (degeneration of the brain’s frontal lobe) are further forms.

In both cases, age is a significant issue. The prevalence of dementia doubles roughly every five years, affecting 2 out of every 100 individuals aged 65 to 69. About 60% of diabetics in Europe are between the ages of 60 and 79, while only 35% are between the ages of 40 and 59.

According to the 2019 World Alzheimer’s study, 62% of medical professionals mistakenly think dementia is a typical aspect of aging, even though aging is a risk factor.

Dementia and diabetes have a reciprocal link. Diabetes increases the risk of developing dementia (1.5x for Alzheimer’s and 2.5x for vascular dementia). On the other hand, dementia may make it more difficult for a person to control their diabetes adequately. Both disorders are complicated, chronic, and progressive, necessitating constant care.

Early Cognitive Changes Linked to Diabetes

For your brain to remain healthy and function properly, it needs a blood supply rich in oxygen. However, hyperglycemia, or excessive blood sugar, damages blood vessels throughout the body, including those in the brain. As a result, the brain receives less blood. High blood sugar also triggers inflammation.

It could harm brain tissue and lead to dementia. Excess insulin can disrupt the balance of several substances the brain depends on. Some of these changes may bring on cognitive decline.

If you experience any of the following symptoms, you may have cognitive impairment:

• Are more likely to forget things
• Struggling to come up with the appropriate wording
• Are quickly sidetracked
• Make bad decisions
• Have difficulty coming to a choice
• Experience shifts in personality and temperament
• Ask the same questions repeatedly

Factors That May Increase Dementia Risk in People With Diabetes

Several factors strengthen the link between diabetes and dementia:

• Chronic hyperglycemia and poor glycemic control
• Heart disease and elevated blood pressure
• Elevated cholesterol levels
• Metabolic syndrome and obesity
• Smoking and inactivity

Read More: Vascular Dementia End-of-Life Symptoms: What to Expect and How to Provide Comfort

Can Good Blood Sugar Control Reduce Risk?

The prevalence of type 1 diabetes is rising globally, and because of advancements in diabetes treatment and technology, this population is surviving longer than ever before. Nevertheless, it remains unclear what degree of blood sugar (glycemic) management is best for preserving brain health in later life.

According to a September 4, 2018, Journal of Diabetes Care article, maintaining blood sugar levels within the American Diabetes Association’s (ADA) suggested range is associated with a reduced risk of dementia.

From 1996 to 2015, the study tracked 3,433 people with type 1 diabetes aged 50 or older who were part of a health care system. The researchers employed statistical modeling to assess the relationship between time-varying blood glucose levels and dementia using medical data of repeated hemoglobin A1c measurements, dementia diagnoses, and comorbidities.

The researchers accounted for age, sex, race/ethnicity, pre-existing medical conditions, and the frequency of hemoglobin A1c (HbA1c) measurements. They discovered that older persons with type 1 diabetes who had poor blood sugar management were up to 79% more likely to acquire dementia.

Lifestyle Habits That Support Brain Health With Diabetes

The good news is you can lower your risk of dementia and type 2 diabetes. Discuss with your doctor whether the following lifestyle changes are appropriate for you right now. Keep in mind that these lifestyle adjustments are beneficial regardless of whether you have been diagnosed with diabetes or prediabetes.

• Exercise aerobically for at least 30 minutes every day, 5 days a week
• Consume a meal of Mediterranean cuisine
• Keep your weight within a healthy range
• Manage elevated blood pressure
• Take care of elevated cholesterol
• Avoid smoking

Last but not least, engaging in social activities, maintaining a happy outlook, learning new things, and listening to music can all improve brain function and lower the risk of dementia.

Medications and Their Potential Role

SGLT-2 inhibitors, which help the kidneys eliminate sugar from the body through urine, may offer protection against dementia and Parkinson’s disease, according to a recent study.

Researchers from Yonsei University College of Medicine in South Korea examined the prevalence of Parkinson’s disease and dementia in patients using SGLT-2 inhibitors versus those using other oral diabetic medications.

The study examined the health of around 360,000 South Koreans with type 2 diabetes who started using diabetes medication between 2014 and 2019. These individuals had an average age of 58.

After adjusting for diabetes medications and comorbidities, researchers found that SGLT-2 inhibitor users experienced a 20% lower incidence of Parkinson’s and Alzheimer’s disease than users of other diabetes medications. SGLT-2 users had a 30% decreased incidence of dementia due to vascular disease.

Read More: Early Signs of Dementia in Women: What to Watch for and When to Seek Help

When to Watch for Cognitive Changes

People with diabetes should keep an eye out for symptoms of cognitive decline, such as:

• Becoming more forgetful
• Medicine management challenges
• Difficulty carrying out everyday duties
• Confusion or disorientation

Practical Steps to Protect Brain Health With Diabetes

Proactive measures can lessen the effects of diabetes and dementia:

• Monitor blood sugar regularly to avoid high blood sugar and cognitive decline
• Keep your cholesterol and blood pressure within normal ranges
• Maintain an active lifestyle to lower insulin resistance
• Follow a balanced diet to improve brain insulin signaling
• Make time for routine medical examinations

Read More: Do People with Dementia Know They Have It? What Awareness Looks Like at Different Stages

Conclusion

There is mounting evidence that diabetes and dementia are very strongly correlated, underscoring the need for long-term metabolic health for brain function.

Conditions like persistently elevated blood sugar, vascular damage, and inflammation can have a detrimental impact on cognitive function, even though experts are currently investigating whether diabetes directly causes dementia.

Reducing hazards requires early symptom identification and regular blood sugar control. A balanced lifestyle, which includes regular exercise, a healthy diet, and routine health monitoring supports both brain and metabolic health.