Methionine is an essential amino acid–amino acids being the building blocks of proteins. This amino acid is essential because the body cannot produce it using other amino acids, meaning it must come from one’s diet. Methionine contains sulfur and is always the first amino acid that is used in making any protein.
If an insufficient amount of essential amino acids are consumed consistently, those doing so may run the risk of being diagnosed with protein deficiencies such as kwashiorkor or marasmus. These deficiencies are often noted with symptoms such as bloated abdomen and fatigue, much the same as the symptoms of general malnourishment.
Soy, seaweed, whitefish, cheese, milk, molluscs, egg whites, seal, whale