I think you are referring to the defficiency disease called "Pellegra". It is caused by a chronic lack of niacin (vitamin B3) or its precursur tryptophan in the diet. It is characterized by dermatitis (skin rash), diarrhea, and mental disturbance, and is often linked to overdependence on corn as a staple. The wikipedia says is it is common in Africa, Indonesia, and China, but is rare in Western societies. In affluent societies the majority of patients with clinical pellegra are poor, homeless, alcohol-dependent, or psychiatric patients who refuse food. The best food sources of B3 are peanuts, brewer's yeast, fish, and meat. Some B3 is also found in whole grains.
It is safe to prevent some things, but, others you must not prevent.
Prevent
prevent it
What is there to prevent?Nothing will happen!
You can't prevent it.
I prevent a cool show.
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I don't think so? But I heard sperm can prevent wrinkles, or help prevent them.
No, Mirena does not prevent chlamydia.
How to prevent the ailment of leukemia
The future tense is will prevent.
Honey does not prevent the disease.