The most efficient source of energy in the human body is

Options

A. Fats
B. Sugars
C. Proteins
D. Nucleic acids

Answer

To determine the most efficient source of energy in the human body, we can analyze the roles of different macromolecules: fats, carbohydrates, and proteins.

### Step-by-Step Solution:

1. **Identify the Types of Energy Sources:**
- The human body utilizes three main macromolecules for energy: fats, carbohydrates (sugars), and proteins.

2. **Understand the Role of Each Macromolecule:**
- **Fats:** They are a concentrated source of energy, providing more energy per gram than carbohydrates and proteins. However, they require more oxygen for oxidation.
- **Carbohydrates (Sugars):** These are considered efficient sources of energy because they require less oxygen for their oxidation process. This means they can be metabolized more quickly to produce energy.
- **Proteins:** While they can also provide energy, they are primarily used for growth and repair of tissues rather than as a primary energy source.

3. **Compare the Efficiency of Energy Production:**
- Since carbohydrates require less oxygen for oxidation compared to fats and proteins, they are more efficient in terms of energy production. This efficiency is crucial for quick energy needs in the body.

4. **Conclusion:**
- Based on the analysis, the most efficient source of energy in the human body is carbohydrates, specifically sugars.

### Final Answer:
The most efficient source of energy in the human body is sugars (carbohydrates).

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