Ketone bodies appear in the blood and urine when fats are being oxidized in great amounts. The condition is a… - BCCL kharkhanda Staff Nurse - 2015

BCCL kharkhanda Staff Nurse - 2015

Biochemistry & Nutrition

Medium

Appeared in: BCCL kharkhanda Staff Nurse - 2015

Explanation

Starvation depletes the body's primary fuel, glucose, and its stored form, glycogen.
To compensate, the body enters a catabolic state, breaking down stored fat for energy through beta-oxidation.
This process produces an excess of acetyl-CoA in the liver, which overwhelms the Krebs cycle.
The liver converts this excess acetyl-CoA into ketone bodies, which are then released into the blood to be used as an alternative fuel source by the brain and other tissues.

Option B: Bone healing is an anabolic process, meaning it involves building tissue. This requires energy and nutrients and is the metabolic opposite of the catabolic (breakdown) state of starvation that leads to ketosis.
Option C: While severe alcoholism can lead to a specific condition called alcoholic ketoacidosis (especially after a binge with poor food intake), starvation is the more fundamental and classic physiological cause of ketosis.
Option D: Positive nitrogen balance signifies an anabolic state where protein synthesis is greater than protein breakdown. This occurs during growth, pregnancy, or recovery from illness. It is the opposite of the catabolic state required for significant ketone production.

Clinical Relevance

Nursing practice connection: Knowing Metabolic response to starvation and the process of ketogenesis helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses frequently test for ketones in urine (ketonuria) using a simple dipstick test. This is a key monitoring parameter for patients with diabetes, prolonged vomiting, or those on ketogenic diets.
It is crucial to differentiate between starvation ketosis and diabetic ketoacidosis (DKA). While both show ketones, DKA is a medical emergency characterized by hyperglycemia and severe acidosis, whereas starvation ketosis occurs with normal or low blood glucose.
Patient education is vital. For patients on a ketogenic diet for weight loss or medical reasons (e.g., epilepsy), the presence of ketones is expected. However, for a patient with Type 1 diabetes, it's a red flag for impending DKA.

How to Approach the Question

First, understand the core physiological process mentioned in the stem: the formation of ketone bodies from the large-scale oxidation of fats.
Recognize that this is a compensatory metabolic state that occurs when the body cannot use glucose for energy.
Analyze the metabolic state implied by each option. Classify them as either anabolic (building up) or catabolic (breaking down).
Eliminate the options representing anabolic states. 'Bone healing' and 'Positive nitrogen balance' are processes of growth and repair.
Evaluate the remaining catabolic options. 'Starvation' is the classic, fundamental condition where the body is deprived of glucose and must turn to fat reserves.
Consider 'Alcoholism'. While it can cause ketosis, it's a more specific pathological process. Starvation is the broader, more direct physiological answer to the question as asked.

Concept Tested & Keywords

Concept Tested: Metabolic response to starvation and the process of ketogenesis.
Stem keywords: Ketone bodies, blood, urine, fats, oxidized
Lead-in keywords: associated with

QmKeWrlTIs64U7pdlUjk2A

E6 Biochemistry U Satyanarayana— Part 1 (pp 26-420 of 840) p. 287-289

E6 Textbook of Biochemistry for medical StudentsDM Vasudevan Part 1 (pp 26-370 of 370) p. 226-228

E6 Biochemistry U Satyanarayana— Part 2 (pp 421-820 of 840) p. 1-3