2. Cheese
Foods High in Lysine
Lysine is an amino acid, one of the building blocks of proteins. Lysine is classified as essential because the body can’t make it. That means people must obtain it from their diets.
Most people in the United States get enough lysine in their diets because it is in protein-rich foods like meat, cheese, fish, eggs, and tofu. Protein deficiency is very rare in the United States, although it can occur in developing countries.
Why You Need Lysine
Since there are 21 different amino acids, tracking how much you are getting of each one would be a difficult task. If you are getting adequate protein, you are probably getting enough lysine. Adults need about 7 grams (g) of protein for every 20 pounds of body weight, so a person weighing 160 pounds would need 56g.
Lysine plays several roles in the body, including two very important ones:
- It helps the body create collagen, which is present in bones and connective tissues such as skin and cartilage.
- It produces carnitine, which converts fatty acids into energy in a process that also lowers cholesterol.
Lysine is sometimes combined with another amino acid, arginine. Scientists say that the two amino acids use the same pathways in the body. Therefore, taking arginine might lower your lysine levels.
As an essential amino acid, lysine is important to health. Although evidence is inconclusive, it has been used for these purposes:
1. Muscle Strength
Athletes have used some amino acids, including lysine, in supplement form to increase muscular strength. Research has failed to prove that lysine improves muscle strength more than strength training alone. One study of older adults showed that taking a combination of three amino acids, including lysine, improved lean body mass.
2. Bone Health
Lysine can help the body absorb calcium, and it can reduce the amount of calcium lost in your urine. Researchers have theorized that lysine could prevent osteoporosis, but they have found no evidence that this is true.
3. Mouth Health
Lysine supplements have been used as a treatment for cold sores caused by the herpes simplex virus and for canker sores. Researchers have not found conclusive evidence that lysine is effective for these problems.
4. Anti-anxiety Effects
Some studies have looked at whether supplements of lysine and arginine could reduce anxiety. In two studies, the subjects showed reduced levels of the stress hormone cortisol.
Foods with Lysine
You can buy lysine supplements, but those with liver or kidney disease should not take them without consulting a doctor. Pregnant and lactating women should use caution. Lysine supplements can also interfere with one type of antibiotic (Aminoglycoside).
Another reason to pass on lysine supplements is that taking a single amino acid in supplement form can negatively affect metabolism. It can also put a burden on the kidneys and affect growth in children.
While there are numerous warnings about taking lysine as a supplement, lysine from food sources is considered safe. Some people seek out spirulina and fenugreek seeds to boost their lysine intake, but your local supermarket has many sources of lysine, including these:
1. Meat and poultry
Beef, pork, and poultry are all good sources of lysine. To promote heart health, most people should choose lean cuts and keep serving sizes small.
2. Cheese
Almost all cheeses are high in protein and calcium but also high in fat and cholesterol. The cheese with the most lysine is parmesan. Just one tablespoon of grated parmesan provides 2 grams of protein and 1 gram of fat.
3. Fish
Many health experts favor fish as a source of healthy protein. Cod and sardines are especially high in lysine.
4. Eggs
Eggs are an inexpensive protein source, although they are high in cholesterol. The American Heart Association says that most adults can eat an egg a day without harm.
5. Soybeans
Vegans and vegetarians need not worry. Tofu is a great source of lysine. If you aren’t a tofu fan, you can also get lysine from soy protein and soybean flour.
Legumes are another protein powerhouse, especially for those on plant-based diets. Choose from beans, peas, lentils, peanuts, and more.
Show Sources
American Heart Association: “Are eggs good for you or not?”
ESHA Research, Inc., Salem, Oregon. “Cheese, parmesan, grated.”
Harvard T.H. Chan School of Public Health: “Protein.”
Integrative Medicine: A Clinician’s Journey: “Lysine for Herpes Simplex Prophylaxis: A Review of the Evidence.”
Journal of Parenteral and Enteral Nutrition: “Year-long changes in protein metabolism in elderly men and women supplemented with a nutrition cocktail of beta-hydroxy-beta-methylbutyrate (HMB), L-arginine, and L-lysine.”
Mount Sinai: “Lysine.”
Nutrition Journal: “Nutritional and herbal supplements for anxiety and anxiety-related disorders: systematic review.”
Nutrition: “Use of amino acids as growth hormone-releasing agents by athletes.”
Penn State Hershey, Milton S. Hershey Medical Center: “Lysine.”
University of Rochester Medical Center: “Lysine.”
16 Foods High in Lysine That Also Pack Protein
Lysine (aka L-lysine) is probably not as top of mind for you like fiber and protein, but this essential amino acid is important for your overall health.
Lysine-rich foods include animal-based foods such as beef, poultry and seafood but the amino acid is also found at lower levels in foods like bananas and other fruits, nuts, popcorn and oatmeal. The body cannot make this amino acid, so it’s important to eat foods high in lysine — though most people get enough in their diet naturally, per Mount Sinai. Athletes, burn patients and vegans who don’t eat beans may need more than the average person.
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Some people believe that foods high in lysine and low in arginine can help prevent cold sores. While lysine blocks the activity of arginine (foods high in arginine can promote herpes simplex virus replication and might aggravate cold sores), most experts don’t think it improves the healing of cold sores — though supplementation may lower the rate of recurrence or improve symptoms, per Mount Sinai.
Overall, there’s not enough convincing evidence that lysine can be used to treat active herpes simplex lesions, per a June 2017 review in Integrative Medicine: A Clinician’s Journal. Still, it offers other benefits like helping your body absorb calcium and preventing calcium loss in urine (which could play a role in protecting your bones) and potentially helping your muscle tissue recover after encountering stress, per Mount Sinai.
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