**Why is milk called a complete food?**

Milk is often referred to as a complete food because it contains a wide range of essential nutrients that are necessary for the growth and development of the human body. It is considered a complete food due to its richness in various components such as proteins, carbohydrates, fats, vitamins, minerals, and water. Let's explore each of these components in detail.

**Proteins:**
Milk is an excellent source of proteins, which are the building blocks of our body. It contains two types of proteins: casein and whey proteins. These proteins are essential for the growth, repair, and maintenance of body tissues, including muscles, organs, and bones.

**Carbohydrates:**
Milk contains lactose, a natural sugar that provides energy to the body. Carbohydrates are the primary source of energy, and lactose in milk helps to meet the energy requirements of our body.

**Fats:**
Milk contains fats, which are essential for the absorption of fat-soluble vitamins (A, D, E, and K) and the production of energy. The fats in milk are also important for brain development in infants and young children.

**Vitamins:**
Milk is a rich source of vitamins, particularly vitamin D and vitamin B12. Vitamin D is necessary for the absorption of calcium and phosphorus, which are important for strong bones and teeth. Vitamin B12 is essential for the proper functioning of the nervous system and the production of red blood cells.

**Minerals:**
Milk is a good source of minerals such as calcium, phosphorus, potassium, and magnesium. Calcium is crucial for the development and maintenance of strong bones and teeth. Phosphorus is necessary for energy production and cell repair. Potassium helps in maintaining fluid balance and regulating blood pressure. Magnesium contributes to bone health and muscle function.

**Water:**
Milk contains a high percentage of water, which is essential for maintaining hydration and carrying out various bodily functions. Water helps in digestion, circulation, and temperature regulation.

In conclusion, milk is called a complete food because it contains a diverse range of essential nutrients, including proteins, carbohydrates, fats, vitamins, minerals, and water. These nutrients are necessary for the overall growth and development of the human body. Regular consumption of milk helps ensure a well-balanced diet and provides the body with the necessary nutrients for optimal health.

Milk is a complete food because it has all the nutrients needed for the body.