Understanding Diabetes: A Comprehensive Guide

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StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; January 2025-

Diabetes is a chronic medical condition that affects how your body turns food into energy. There are three main types of diabetes: type 1, type 2, and gestational diabetes. Type 1 diabetes is usually diagnosed in children and young adults and is when the body does not produce insulin. Type 2 diabetes is more common and occurs when the body does not use insulin properly. Gestational diabetes occurs during pregnancy and can increase the risk of both the mother and baby developing type 2 diabetes in the future.

StatPearls [Internet].

Amit Sapra; Priyanka Bhandari.

Authors

Author Information:
Amit Sapra, MD. Department of Endocrinology, ABC Hospital, XYZ City, State, Country. Email: amitsapra@email.com
Priyanka Bhandari, MD. Department of Internal Medicine, DEF Hospital, UVW City, State, Country. Email: priyankabhandari@email.com

Affiliations

Last Updated: June 21, 2023.

Continuing Education Activity

Diabetes mellitus (DM) is a condition characterized by inadequate regulation of glucose levels in the blood. There are various types of DM, such as type 1, type 2, MODY, gestational diabetes, neonatal diabetes, and steroid-induced diabetes. Type 1 and type 2 DM are the primary subtypes, each with distinct pathophysiology, symptoms, and treatment, but both share the risk of hyperglycemia. This discussion delves into the pathophysiology, evaluation, and treatment of DM and emphasizes the importance of an interprofessional approach in managing patients with this disease.

Recognize the significance of enhancing teamwork and coordination among the interprofessional team to improve patient care for individuals with diabetes mellitus.

Introduction

Diabetes mellitus originates from the combination of the Greek word diabetes, meaning siphon – to pass through, and the Latin word mellitus, meaning sweet. Historically, the term “diabetes” was first used by Apollonius of Memphis around 250 to 300 BC. Ancient civilizations like the Greeks, Indians, and Egyptians noted the sweet taste of urine in this condition, leading to the term Diabetes Mellitus. In 1889, Mering and Minkowski discovered the involvement of the pancreas in diabetes pathogenesis. The purification of insulin by Banting, Best, and Collip in 1922 at the University of Toronto marked a significant milestone in diabetes treatment. Despite numerous advancements, diabetes remains a prevalent chronic illness globally and in the US, ranking as the seventh leading cause of death.

Diabetes mellitus (DM) is a metabolic disorder characterized by elevated blood glucose levels. DM includes several subtypes like type 1, type 2, MODY, gestational diabetes, neonatal diabetes, and secondary causes due to endocrine disorders or steroid use. The main types, T1DM and T2DM, stem from defects in insulin secretion or action, presenting distinct etiologies, symptoms, and treatments.

Etiology

Within the pancreas’ islets of Langerhans, there are two main types of endocrine cells: beta cells producing insulin and alpha cells secreting glucagon. Beta and alpha cells adjust their hormone secretions based on glucose levels. In diabetes, the balance between insulin and glucagon is disrupted, leading to elevated blood glucose levels.

T1DM results from the destruction of pancreatic beta cells, primarily due to an autoimmune process, leading to severe insulin deficiency.

T2DM involves insulin imbalance and resistance, often stemming from obesity and aging factors.

The genetic influence on both types of diabetes is significant, with specific loci like MHC and HLA playing a role in T1DM risk, while T2DM is more influenced by genetic and lifestyle factors.

MODY, gestational diabetes, and other secondary causes of diabetes can be linked to specific genetic mutations or conditions impacting glucose regulation.

In addition to genetic and lifestyle factors, environmental factors such as diet, physical activity, and stress can also contribute to the development and progression of diabetes.

Epidemiology

Globally, approximately 1 in 11 adults has diabetes, predominantly T2DM. The onset of T1DM peaks in children around ages 4 to 6 and 10 to 14, with about 45% diagnosed before age ten. The incidence of T1DM is gradually increasing, particularly in certain populations and regions.

T2DM usually develops later in life, but rising obesity rates in younger individuals have led to an increase in youth-onset T2DM. Prevalence rates vary among ethnic groups, with higher rates in certain populations like Native Americans and Hispanics compared to Whites.

The projections suggest a significant rise in DM cases globally by 2040, driven by lifestyle changes and demographic shifts.

Pathophysiology

Individuals with diabetes may experience hyperglycemia, impacting pancreatic function and insulin secretion. Insulin resistance and chronic hyperglycemia can lead to severe complications like retinopathy, nephropathy, and neuropathy. Monitoring and managing blood glucose levels are crucial in preventing these long-term effects of diabetes.

When taking a patient’s medical history, it is crucial to inquire about their family background, autoimmune disorders, and insulin resistance as these factors help in diagnosing diabetes mellitus (DM). Common signs of DM include increased urination, excessive thirst, and unexplained weight loss. Physical indicators may include poor skin elasticity and a sweet-smelling breath. The diagnosis of Type 1 DM is typically determined by a distinct medical history and elevated blood sugar levels. Various laboratory tests play a vital role in managing chronic DM.
Management of diabetes involves a comprehensive approach involving patient education, dietary control, regular physical activity, and monitoring blood glucose levels. Patients with Type 1 DM usually require insulin therapy, while initial treatment for Type 2 DM focuses on diet and exercise. Medications like metformin are often prescribed for Type 2 DM, with insulin administration necessary in certain cases. Regular screenings are essential to detect complications like retinopathy and neuropathy.
Active patient involvement and proactive management are key to achieving successful outcomes in diabetes care. It is crucial to maintain blood glucose levels within a specific range and monitor for potential complications to prevent adverse effects associated with diabetes. Treatment options may include lifestyle adjustments, medications, and occasionally surgical procedures for specific situations. Regular medical check-ups and screenings are fundamental in managing diabetes and averting complications.
The American Diabetes Association highlights the importance of routine blood pressure monitoring for individuals with diabetes to maintain optimal levels. Treatment usually involves various medications such as ACE inhibitors, ARBs, diuretics, beta-blockers, and calcium channel blockers. Regular lipid testing is necessary to keep LDL-C levels within target ranges. Statins are commonly used to manage dyslipidemia. Low-dose aspirin may benefit high-risk diabetic patients, although its efficacy in preventing cardiovascular events remains uncertain.
Disorders affecting the pancreas can contribute to diabetes development, including Type 1 DM, Type 2 DM, and MODY. Hormonal conditions and drug-induced insulin resistance are among the factors that can impair insulin production. Clinical trials have demonstrated that certain antidiabetic medications can have positive effects on cardiovascular health, reducing mortality and heart failure risks. However, different medications may have adverse effects, such as hypoglycemia with insulin or gastrointestinal issues with some Type 2 DM drugs.
In 2015, diabetes was the seventh leading cause of death in the United States, with poorly managed glucose levels increasing the risk of complications. Chronic hyperglycemia is associated with microvascular issues in both Type 1 and Type 2 DM. Reversing high glucose levels can help slow down disease progression. Complications of diabetes encompass microvascular, macrovascular, and neuropathic problems like nephropathy, retinopathy, neuropathy, and cardiovascular events. Heart disease poses a significant risk, with diabetes being a common cause of blindness, kidney problems, and limb amputations in the US. Moreover, evidence suggests a link between Type 2 DM and cancer development, and pregnant individuals with gestational diabetes face increased risks.
One of the most severe complications of diabetes is diabetic ketoacidosis (DKA), where insufficient insulin levels lead to the breakdown of fats into ketones for energy, resulting in systemic acidosis. In Type 2 diabetes, hyperosmolar hyperglycemic syndrome (HHS) can also occur, requiring intensive management. Healthcare professionals need to educate diabetes patients on making lasting lifestyle changes for effective disease management. Individualized education is more beneficial than group sessions, particularly for patients with poorly controlled diabetes. A collaborative approach involving healthcare professionals like nurses, pharmacists, and nutritionists is essential for optimal diabetes care outcomes.
Studies have shown that amino acid metabolism may play a crucial role in the development of Type 2 diabetes. Elevated levels of specific amino acids have been associated with hyperglycemia, while certain metabolites increase the risk of inflammatory pathways leading to metabolic dysfunction. Early detection and monitoring of these markers can help in managing metabolic syndrome and its associated complications.
Primary care providers play a vital role in identifying and managing diabetes, often requiring a team-based approach involving various healthcare professionals such as nurse practitioners, physician assistants, dietitians, and diabetes educators. Regular follow-ups, monitoring, and patient education are essential components of diabetes care. Additional specialists like ophthalmologists, neurologists, and podiatrists help prevent microvascular complications, while endocrinologists may manage complex cases. Pharmacists ensure proper medication administration and education. Individualized patient education and an interprofessional team approach have been shown to yield the best outcomes in diabetes care.
References available upon request.
The study by Forbes JM and Cooper ME discusses the mechanisms of diabetic complications, while Tseng CH explores the relationship between diabetes and bladder cancer in Taiwan. Yin M et al. found that metformin can benefit cancer patients with type 2 diabetes. Murphy HR et al. researched the influence of glycemic control, obesity, and social disadvantage on obstetric and perinatal outcomes in pregnancies complicated by type 1 and type 2 diabetes. Martínez E et al. present a debate on diabetic ketoacidosis still being a problem in pediatric T1DM. Karslioglu French E et al. review diabetic ketoacidosis and hyperosmolar hyperglycemic syndrome in adult patients. Sperl-Hillen J et al. conducted a comparative study on patient education methods for type 2 diabetes. Wang TJ et al. studied metabolite profiles and the risk of developing diabetes. Lent-Schochet D et al., Reddy P et al., Shim K et al., and Ramakrishanan N et al. explored various metabolic aspects of nascent metabolic syndrome. No relevant financial relationships with ineligible companies were declared by Amit Sapra and Priyanka Bhandari.