Foods That Cause Fever Blisters


Whether you call it a cold sore or fever blister, herpes-related sores can be embarrassing and uncomfortable. The best way to deal with a fever blister is to prevent one from occurring altogether. There are many different theories for preventing an outbreak. One popular theory involves what foods you eat.

Herpes on lips.
Herpes on lips. (Image: apichsn/iStock/Getty Images)


A fever blister is a sore, blister or lesion that typically appears on the lips, mouth and face regions. The blisters are caused by a viral infection of the herpes simplex virus, which appears in two types. Fever blisters or oral herpes are type 1. Genital herpes are type 2, normally. When a fever blister appears, it’s usually a symptom of the type 1 virus.

Herpes on mouth.
Herpes on mouth. (Image: Artem Efimov/iStock/Getty Images)


The type 1 virus is spread through contact with infected saliva, which could come from sharing a drink or kissing someone. It is most contagious when the other person has an active herpes outbreak. But, you can also contract the virus through contact with someone who doesn’t show any symptoms.

Herpes can be spread through kissing.
Herpes can be spread through kissing. (Image: karelnoppe/iStock/Getty Images)


Once you have been infected with the herpes virus, it spreads to the nerve cells and stays in the body for the rest of your life. It remains dormant until the body’s defenses are weakened. This can happen with stress, trauma, illness, injury, exposure to sunlight and fever.

Stress causes the body to be weakened.
Stress causes the body to be weakened. (Image: Jupiterimages/Polka Dot/Getty Images)


Six out of seven double-blind, placebo controlled studies showed lysine to be effective at decreasing outbreak occurrences, according to an article on One study examined the ratio between lysine and arginine in the body to see if they effected the amount of outbreaks. The results were somewhat conflicting but it was concluded that arginine reduction can suppress the virus to some degree. suggests that a "total approach' be used toward your nutrition, which means the combination of eating the right foods and taking lysine supplements.

Apples are good for nutrition.
Apples are good for nutrition. (Image: Stockbyte/Stockbyte/Getty Images)

Instigating Foods

Arginine and lysine are found in foods you eat everyday. If you want to reduce arginine from your diet, nuts like walnuts, almonds, pecans, peanuts and others are one of the most arginine-rich foods and should be avoided. Other foods high in arginine and low in lysine are coconut, peanut butter, onions, and certain fruits like grapes, blueberries and blackberries. If you are having outbreaks, you should consider limiting these items in your diet.

Avoid walnuts.
Avoid walnuts. (Image: Stockbyte/Stockbyte/Getty Images)

Foods for Prevention

On the other hand, you can still eat many foods without worrying about the lysine and arginine content. Many dairy products like yogurt, milk and cheeses are high in lysine and low in arginine. Other fruits like apples, pears and figs along with most fish are in the normal range as well. A good resource for the ratio of lysine to arginine in certain foods is available at Find a link in the Resources section.

Yogurt is a good food.
Yogurt is a good food. (Image: George Doyle/Stockbyte/Getty Images)

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