Step 1: Understanding the Concept:
Foods are broadly categorized into three groups based on their primary nutritional functions:
1. Energy-giving foods: Rich in carbohydrates and fats (e.g., cereals, oils).
2. Body-building foods: Rich in proteins, essential for growth, muscle development, and tissue repair.
3. Protective foods: Rich in vitamins and minerals (e.g., fruits, vegetables).
Step 2: Detailed Explanation:
Let us evaluate each of the options based on their primary macronutrient content:
- Fish (A): An excellent source of high-quality animal protein containing all essential amino acids, making it a classic body-building food.
- Beans (B): Rich in plant-based proteins, making them a key body-building food group, especially in vegetarian diets.
- Egg (D): Contains reference proteins with a biological value of nearly 100%, making it one of the best recommended body-building foods.
- Corn (C): Maize (corn) is a cereal crop. It is primarily composed of carbohydrates (starch) and acts as an energy-giving food.
While it contains minor amounts of protein (such as zein), it is deficient in essential amino acids like lysine and tryptophan, and is not classified or recommended as a primary body-building (protein) food.
Therefore, Corn is not a recommended body-building food.
Step 3: Final Answer:
The correct option is (C).