What are deficiency diseases? Name the disease caused due co protein deficiency in children.

Explanation

### Step-by-Step Solution:

1. **Understanding Deficiency Diseases**:
- Deficiency diseases occur when the body lacks essential nutrients due to an inadequate diet. These nutrients can include vitamins, minerals, proteins, carbohydrates, and fats. When the levels of these nutrients drop below what the body needs, it can lead to various health issues or disorders.

2. **Identifying Protein Deficiency**:
- Proteins are crucial for growth, repair, and overall health. In children, a lack of protein can lead to serious health problems, as their bodies require adequate protein for development.

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