How important are proteins in your diet

Proteins are responsible for many functions in a human body, and not just one single process. The most important protein role is to act as a structural component of body cells and tissues. Without adequate protein presence in diets, body cells and tissues won't be able function, either properly, either at all.
 
Proteins are large, complex molecules, made up of smaller amino acid compounds. Some amino acids are produced by the human body, and they are not essential. However, some amino acids are very essential, and people need to get them from their diets. People who are going on a diet should consume protein-rich foods every day, because the human body does not have a way to store this macro-nutrient.
 
Amino acids in proteins stack on top of one another, in a way that provides structure for several components of a human body. These bands of amino acids create walls of cells, build tissues, repair skin, and make up vital organs. Amino acids are automatically broken down by the body system, and the system also continuously repairs and replaces them when needed. For example, if you're doing your exercises regularly, you build up more muscle mass, and your body pulls amino acids from proteins to build new muscle tissue or to repair muscle tissue that becomes broken.
 
Proteins also have other roles in a human body. As macro-nutrients, proteins provide energy for the body in the form of calories. If and when carbohydrates and fats are not available, human body burns proteins. Also, some proteins aid in hormone production, while others support functions of the human body's immune system. Human body system pulls all these amino acids it needs to support all the functions needed, and then it excretes the excess through urine.
 
Proteins that are found in foods can be either complete or incomplete. Complete proteins provide all of the essential amino acids (there are more than twenty of them). Meat, dairy (whey protein as one of the best protein sources for humans), seafood, and eggs are foods with complete proteins. On the other hand, incomplete proteins provide only the essential amino acids you need each day. Proteins that are found in plants, such as nuts, beans, and lentils, are all incomplete proteins. The human body can get all of the amino acids it needs during the day solely from incomplete protein sources, but there has to be a variety of these foods during the day. Consuming several types of incomplete protein sources ensures that the human body gets the essential amino acids that some types of food may be lacking.
 
In order to support all of the protein functions, it is very important to meet daily recommendations. Of course, protein recommendations vary depending on everybody's activity level. If someone's relatively sedentary, then that person will need less proteins in compare to persons who exercise every day. According to some dietary guidelines, diets should consist out of 10 to 35% protein. All proteins have only four calories per gram, and therefore, if someone is following an 1,800 calories diet, then that person would need between 147 and 157 grams of protein each day.