Diabetes Mellitus — Definition

Definition

Imagine your body as a car that runs on fuel, and that fuel is glucose, a type of sugar derived from the food you eat. For this fuel to get from your bloodstream into your cells (the engine of your car) where it can be used for energy, you need a special key called insulin.

Insulin is a hormone made by a small organ behind your stomach called the pancreas. When you eat, your blood sugar (glucose) levels rise, and your pancreas releases insulin to help move that sugar into your cells.

Diabetes Mellitus, often simply called diabetes, is a condition where your body either doesn't make enough of this insulin key, or the keys it makes don't work properly to unlock the cells.

When the insulin key is missing or faulty, the glucose can't get into your cells, so it builds up in your bloodstream. This high blood sugar level is called hyperglycemia. Over time, persistently high blood sugar can cause serious damage to various parts of your body, including your eyes, kidneys, nerves, and heart.

There are mainly two types of diabetes that NEET aspirants should know:

1
Type 1 Diabetes: — This is like your body's immune system mistakenly attacking and destroying the cells in your pancreas that make insulin. It's an autoimmune disease. Because these cells are destroyed, your body produces very little or no insulin at all. People with Type 1 diabetes need to take insulin injections every day to survive. It usually develops in children or young adults, but can occur at any age.

1
Type 2 Diabetes: — This is the most common type. Here, your body either doesn't produce enough insulin, or more commonly, your cells don't respond well to the insulin that is produced. This is called 'insulin resistance.' It's like having keys, but the locks on your cells are jammed. Initially, the pancreas tries to compensate by making more insulin, but eventually, it can't keep up, and blood sugar levels rise. Type 2 diabetes is often linked to lifestyle factors like obesity, lack of physical activity, and genetics. It usually develops in adults, but is increasingly seen in younger individuals.

Another important type is Gestational Diabetes, which develops in some women during pregnancy and usually resolves after childbirth, though it increases the risk of developing Type 2 diabetes later.

The common symptoms of diabetes include frequent urination (polyuria), increased thirst (polydipsia), and increased hunger (polyphagia). Early diagnosis and management are crucial to prevent long-term complications.