When swollen lymph nodes are caused by an infection, this is known as lymphadenitis (lim-fad-uh-NIE-tis). Rarely, swollen lymph nodes are caused by cancer. Your lymph nodes, also called lymph glands, play a vital role in your body's ability to fight off infections. They function as filters, trapping viruses, bacteria and other causes of illnesses before they can infect other parts of your body.
As a source of calories, proteins provide four Calories per gram. Proteins are made up of smaller building blocks called amino acids. Twenty amino acids make up all of the human proteins. Of these twenty amino acids, the body can produce only 12, but 8 must be incorporated into the diet.
An important aspect of nutrition is the daily intake of nutrients. Nutrients consist of various chemical substances in the food that makes up each person's diet. Many nutrients are essential for life, and an adequate amount of nutrients in the diet is necessary for providing energy, building and maintaining.eople depend on nutrients in their diet because the human body is not able to produce many of these nutrientsâor it cannot produce them in adequate amounts. Nutrients are essential to the human diet if they meet two characteristics.