Which of the following statements is False?
**Core Concept**
The question is testing the understanding of the pathophysiology of type 2 diabetes mellitus and the role of insulin resistance in its development. Insulin resistance is a key feature of type 2 diabetes, where the body's cells become less responsive to insulin, leading to hyperglycemia.
**Why the Correct Answer is Right**
Insulin resistance is a complex process involving multiple pathways, including the activation of protein kinase C (PKC) and the inhibition of insulin receptor substrate (IRS) signaling. This leads to a decrease in the translocation of glucose transporter type 4 (GLUT4) to the cell surface, resulting in impaired glucose uptake by skeletal muscle and adipose tissue. The correct answer should accurately reflect this understanding.
**Why Each Wrong Option is Incorrect**
**Option A:** This statement is incorrect because it implies that insulin deficiency is the sole cause of type 2 diabetes, which is not true. While some individuals with type 2 diabetes may have impaired insulin secretion, insulin resistance is a more common and critical factor in the development of the disease.
**Option B:** This statement is incorrect because it suggests that insulin resistance is not a key feature of type 2 diabetes. As mentioned earlier, insulin resistance is a hallmark of the disease, leading to impaired glucose uptake by cells.
**Option C:** This statement is incorrect because it implies that type 2 diabetes is solely caused by obesity. While obesity is a major risk factor for type 2 diabetes, other factors such as genetics, ethnicity, and physical inactivity also play important roles.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that insulin resistance is a reversible condition, and lifestyle modifications such as diet and exercise can improve insulin sensitivity and reduce the risk of developing type 2 diabetes.
**Correct Answer: B. Insulin resistance is not a key feature of type 2 diabetes.**