In starv ation, there is ketosis due to –
**Core Concept**
Starvation leads to ketosis due to the body's adaptation to utilize alternative energy sources when glucose is scarce. The liver plays a crucial role in this process by breaking down fatty acids into ketone bodies.
**Why the Correct Answer is Right**
During starvation, the body's glucose stores are depleted, and the liver increases the production of ketone bodies through a process called ketogenesis. This involves the breakdown of fatty acids into acetyl-CoA, which then enters the citric acid cycle. However, when the citric acid cycle is saturated with acetyl-CoA, the liver converts it into ketone bodies, including acetoacetate, beta-hydroxybutyrate, and acetone. These ketone bodies are then used as an alternative energy source by the brain, heart, and other organs.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because starvation does not directly lead to the production of lactate, which is a product of anaerobic glycolysis.
**Option B:** This option is incorrect because starvation does not directly lead to the production of uric acid, which is a product of purine metabolism.
**Option C:** This option is incorrect because starvation does not directly lead to the production of creatinine, which is a product of muscle metabolism.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that ketosis can also occur in other conditions, such as uncontrolled diabetes mellitus, where the body produces ketone bodies due to a lack of insulin and an excess of glucagon. This can lead to diabetic ketoacidosis, a life-threatening condition that requires immediate medical attention.
**Correct Answer: D.**