PROTEIN SOURCES

In nutrition, proteins are broken down in the stomach during digestion by enzymes known as proteases into smaller polypeptides to provide amino acids for the organism, including the essential amino acids that the organism cannot biosynthesize itself.

Aside from their role in protein synthesis, amino acids are also important nutritional sources of nitrogen.

Proteins contain 17 kilojoules (4 Calories) per gram as opposed to lipids which contain 37.8 kilojoules (9 Calories) and alcohols which contain 29.4 kilojoules (7 Calories).

Note that 1 Calorie = 1 kilocalorie = 4.184 kilojoules. These numbers are averages, as each protein is slightly different (range roughly 3.5–4.5).

The liver, and to a much lesser extent the kidneys, can convert amino acids used by cells in protein biosynthesis into glucose by a process known as gluconeogenesis. The amino acids leucine and lysine are exceptions.

The Indispensable Amino Acids are   :

§  Leucine

§  Isoleucine

§  Valine

§  Lysine

§  Threonine

§  Tryptophan

§  Methionine

§  Phenylalanine

§  Histidine  

Histidine is considered to be an indispensable amino acid because of the detrimental effects on haemoglobin concentrations that have been observed when individuals are fed histidine-free diets.

Most animal sources and certain vegetable sources have the complete complement of all the essential amino acids in adequate proportions.

However, it is not necessary to consume a single food source that contains all the essential amino acids, as long as all the essential amino acids are eventually present in the diet. 

LIST OF HIGH PROTEIN FOODS

When you think of a list of high protein foods, do you picture meat, meat, and more meat? If so, then you might be surprised! While meat is a good source of protein, there are other, more surprising sources as well. In fact, even vegetarians can get plenty of protein in their diet.

WHO NEEDS PROTEIN?

While protein is emphasized as part of a low carb diet and is the focus of the high protein diets, the truth is everyone needs protein. Protein is crucial for building muscle. As we age, we need adequate protein to keep the body from breaking down its own tissues.

            Proper protein intake also contributes to:

§  Immune health

§  Respiratory health

§  Proper growth in children

§  Protecting muscle mass during weight loss

§  Heart strength

LIST OF HIGH PROTEIN FOODS

MEAT AND POULTRY

Since most people think of animal sources when they think of protein, we'll get this out of the way first. Yes, meat and poultry are excellent sources of protein.

The following have high levels of protein per serving    :

 FISH AND SEAFOOD

For heart-healthy fat and protein all in one tasty dish, try getting more fish and seafood in your diet.

Here are some of the highest protein fish options: