Diabetes mellitus
At a Glance
Diabetes mellitus is a chronic condition characterized by high levels of sugar in the blood because the body does not produce enough insulin or cannot effectively use the insulin it produces.
While Type 1 diabetes is often diagnosed in children and young adults and Type 2 diabetes is most common in adults over age 45, the condition affects millions of people globally across all age groups.
Diabetes mellitus is a chronic, lifelong condition that is manageable with ongoing medical treatment and lifestyle modifications but requires vigilance to prevent acute complications.
Most people with diabetes can live long and active lives if they manage their blood sugar levels effectively, though poor control can lead to serious complications that impact quality of life and longevity.
How It Affects You
Diabetes mellitus is a chronic metabolic disease that impairs the body's ability to process blood glucose, leading to elevated sugar levels that circulate throughout the entire system. Over time, this condition causes widespread damage to blood vessels and nerves, compromising the function of vital organs. Common effects on the body include:
- Damage to the eyes, kidneys, and heart due to microvascular and macrovascular complications.
- Nerve damage (neuropathy) that typically affects the feet and hands, causing numbness or pain.
- Reduced blood flow and impaired immune response, leading to slower healing of wounds and increased infection risk.
Causes and Risk Factors
Underlying Causes
Diabetes mellitus develops when the body has trouble with insulin, a hormone that helps glucose get into cells for energy. In Type 1 diabetes, the immune system attacks and destroys the insulin-producing cells in the pancreas, stopping insulin production entirely. In Type 2 diabetes, the body becomes resistant to the effects of insulin, and the pancreas eventually cannot make enough to overcome this resistance. Gestational diabetes occurs during pregnancy when hormonal changes make the body less sensitive to insulin.
Risk Factors
Risk factors vary significantly by the type of diabetes. Risk factors for Type 1 diabetes include a family history of the disease, genetics, and age, as it usually appears in childhood or young adulthood. Risk factors for Type 2 diabetes include being overweight or obese, age 45 or older, a family history of diabetes, high blood pressure, and a sedentary lifestyle. Certain populations, including African Americans, Hispanic/Latino Americans, American Indians, and Asian Americans, are at higher risk.
Prevention Strategies
Currently, there is no way to prevent Type 1 diabetes. However, Type 2 diabetes can often be prevented or delayed through healthy lifestyle choices. Primary prevention involves maintaining a healthy body weight, eating a balanced diet rich in fiber and low in processed foods, and engaging in at least 150 minutes of moderate aerobic activity per week. For those with prediabetes, these changes can stop the progression to full Type 2 diabetes.
Diagnosis, Signs, and Symptoms
Common Symptoms
Symptoms of diabetes occur because of high blood sugar and can be mild or severe. Typical signs include increased thirst (polydipsia), frequent urination (polyuria), extreme hunger (polyphagia), unexplained weight loss, fatigue, irritability, and blurred vision. In Type 1 diabetes, symptoms tend to come on quickly and severely. In Type 2 diabetes, symptoms may develop slowly over many years and can be so subtle that they are missed until complications arise.
Diagnostic Tests
Clinicians diagnose diabetes using blood tests that measure glucose levels. The A1C test measures your average blood sugar level over the past two or three months. A Fasting Plasma Glucose (FPG) test measures blood sugar after you have not eaten for at least 8 hours. The Oral Glucose Tolerance Test (OGTT) involves drinking a sugary solution and checking blood sugar levels periodically. Random plasma glucose tests may also be used if severe symptoms are present.
Differential Diagnosis
Doctors may consider other conditions that cause hyperglycemia or similar symptoms before confirming a diagnosis. These include stress hyperglycemia caused by acute illness or infection, diabetes insipidus (a rare condition involving fluid balance unrelated to blood sugar), and medication-induced high blood sugar from drugs like corticosteroids.
Treatment and Management
Medication and Therapy
Treatment depends on the specific type of diabetes but always aims to control blood sugar levels. People with Type 1 diabetes need lifelong insulin therapy, administered via injections or an insulin pump. Treatment for Type 2 diabetes may begin with lifestyle changes and progress to oral medications like metformin, or injectable medications that improve insulin sensitivity or production. Some people with Type 2 diabetes may also eventually need insulin.
Lifestyle and Self-Care
Managing diabetes requires daily self-care and lifestyle adjustments. This includes following a balanced meal plan that monitors carbohydrate intake, as carbs directly affect blood sugar. Regular physical activity helps the body use insulin more effectively and lowers blood sugar. Monitoring blood glucose levels at home helps patients understand how food, activity, and stress affect their body.
When to Seek Medical Care
You should see a doctor regularly for check-ups to monitor your A1C and screen for complications. Seek medical attention immediately if you experience symptoms of very high blood sugar (hyperglycemia) or very low blood sugar (hypoglycemia) that you cannot manage at home. Emergency care is needed for signs of diabetic ketoacidosis, such as nausea, vomiting, abdominal pain, confusion, and fruity-smelling breath.
Severity and Prognosis
Severity and Complications
Diabetes is a serious condition that ranges from manageable to life-threatening depending on how well blood sugar is controlled. Chronic high blood sugar damages blood vessels and nerves, leading to complications over time. Common long-term effects include cardiovascular disease, kidney damage (nephropathy), eye damage potentially leading to blindness (retinopathy), and nerve damage (neuropathy) that can lead to foot ulcers and amputations.
Prognosis and Outlook
With modern treatments and diligent management, the prognosis for people with diabetes is generally good. While the condition typically requires lifelong management, preventing or delaying complications is possible. Life expectancy for people with diabetes has improved significantly, though it can still be lower than the general population if the disease is not well-controlled or if cardiovascular complications develop.
Impact on Daily Life
Impact on Routine and Activities
Living with diabetes involves incorporating health management into daily routines. This may mean checking blood sugar levels several times a day, planning meals carefully, and scheduling regular exercise. While this can be demanding, it does not prevent people from working, attending school, or participating in sports. Many people find that the healthy habits required for diabetes management improve their overall well-being.
Emotional and Mental Health
The constant need for monitoring and decision-making can lead to "diabetes distress" or burnout. It is important to address mental health by seeking support from counselors, support groups, or healthcare providers. Connecting with others who have the condition can reduce feelings of isolation and provide practical tips for coping.
Questions to Ask Your Healthcare Provider
Being prepared for appointments can help you better manage your condition. Consider asking the following questions:
- What is my target range for blood sugar and A1C?
- How often should I check my blood sugar at home?
- What specific changes should I make to my diet?
- How do my medications work and what are the side effects?
- What signs of complications should I look out for?
- Is it safe for me to start a new exercise program?
Common Questions and Answers
Q: Can eating too much sugar cause diabetes?
A: Eating sugar does not directly cause Type 1 diabetes. However, a diet high in calories and added sugars can lead to weight gain, which is a major risk factor for developing Type 2 diabetes.
Q: Is diabetes contagious?
A: No, diabetes is not contagious. You cannot catch it from someone else like a cold or the flu; it is a non-communicable disease related to genetics and lifestyle factors.
Q: Can people with diabetes eat fruit?
A: Yes, people with diabetes can eat fruit. Fruit contains natural sugars but also provides essential fiber, vitamins, and minerals. It is best to eat whole fruits rather than drinking juice and to monitor portion sizes as part of a balanced meal plan.
Q: Will I eventually need insulin if I have Type 2 diabetes?
A: Not everyone with Type 2 diabetes will need insulin. Many people manage their condition with diet, exercise, and oral medications. However, because Type 2 diabetes is a progressive condition, the body may produce less insulin over time, making insulin therapy necessary for some people to maintain healthy blood sugar levels.
Q: Is there a cure for diabetes?
A: There is currently no cure for diabetes. Type 1 diabetes requires lifelong insulin. Type 2 diabetes can sometimes be put into remission through weight loss and lifestyle changes, meaning blood sugar returns to normal levels without medication, but the risk of it returning remains.