## Core Concept
Hunger pangs, also known as hunger pains or growling, are sensations of discomfort or weakness felt when the stomach is empty and the body needs food. These sensations are primarily associated with the stomach's contractions when it is empty.

## Why the Correct Answer is Right
The correct answer, , indicates that hunger pangs are typically felt approximately 12-24 hours after starvation. When a person fasts or starves, the body initially uses stored glycogen for energy. Once glycogen stores are depleted, usually within 12-18 hours, the body begins to break down fat for energy. It is during the transition from using glycogen to fat metabolism, and slightly thereafter, that individuals often start to feel hunger pangs. These pangs are due to the stomach's muscular contractions, which are stronger and more frequent when the stomach is empty and the body signals the need for food intake.

## Why Each Wrong Option is Incorrect
- **Option A:** This timeframe is too short for the onset of significant hunger pangs related to starvation. Initially, after a meal, the body might not immediately feel hungry.
- **Option B:** This option suggests a broader timeframe that includes but is not specific to when hunger pangs are typically felt.
- **Option D:** This option suggests a timeframe that is generally too long for the initial onset of hunger pangs.

## Clinical Pearl / High-Yield Fact
A key point to remember is that hunger pangs can be an important signal for nutritional intake, but their absence does not necessarily mean one is not in a catabolic state. In critical illness or prolonged fasting, the sensation of hunger can be blunted.

## Correct Answer Line
**Correct Answer: B. .**