Protein is the main component of muscles, organs and glands, and is also required by the body for muscle growth, to fight infection and assist in the process of wound healing. It accounts for approximately 15% of the total mass of an individual. Therefore consuming the correct amount of protein is essential to the health of an individual, especially a player. As players train and compete more the amount of wear and tear their bodies undergo increases, therefore protein is essential to repair itself, without having to use protein already stored in the body.
The recommended normal consumption of protein would be approximately 40 grams per day, depending on age. Anything below this figure, if maintained over a long period of time, can lead to health problems, including muscle wastage.
This type of diet is very unhealthy and is only really suggested to those who suffer from liver or kidney diseases, and they should only undertake such a diet after consultation with a medical professional. This should definitely not be adopted by an active individual or a footballer (unless medically advised).