Improper diet leads to malnutrition.

Explanation

### Step-by-Step Solution:

1. **Understanding the Concept of Diet**: A diet refers to the kinds of food that a person habitually eats. It is essential for providing the nutrients our body needs to function properly.

2. **Definition of a Balanced Diet**: A balanced diet includes the right proportions of all the necessary nutrients. This means consuming carbohydrates, proteins, fats, vitamins, and minerals in appropriate amounts.

3. **Nutrients Classification**: Nutrients can be classified into two categories:
- **Macronutrients**: These include carbohydrates, proteins, and fats. They are required in larger quantities.
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