Why are proteins important in our diet?

Proteins are essential in our diet as they provide the body with amino acids, which are vital for growth and repair.

Proteins are large, complex molecules that play many critical roles in the body. They are made up of smaller units called amino acids, which are linked together in long chains. There are 20 different types of amino acids that can be combined to make a protein. The sequence of amino acids determines each protein’s unique 3-dimensional structure and its specific function.

Our bodies can make some amino acids, but there are nine that can't be produced internally. These are known as essential amino acids and we must get them from our diet. Without an adequate supply of these essential amino acids, the body can't synthesise the proteins it needs to function properly. This can lead to a variety of health problems, including muscle wasting, weakened immune system, and impaired growth and development in children.

Proteins also serve as enzymes, which speed up chemical reactions in the body, and hormones, which act as the body's chemical messengers. They are involved in nearly every function in the body, from helping to repair tissues to making antibodies that fight off infections.

Furthermore, proteins provide a source of energy. Each gram of protein provides about 4 calories of energy. However, the body prefers to use carbohydrates and fats for energy before it uses protein. When dietary intake of these nutrients is insufficient, the body will break down proteins to meet its energy needs.

In conclusion, proteins are a crucial part of our diet. They provide the body with essential amino acids, serve various functions in the body, and can also be used as a source of energy. Therefore, it's important to consume a balanced diet that includes adequate amounts of protein.