Who gets pellagra?

Pellagra is rare in the UK, but might be found in the following groups of people:

People whose diet is based around corn or maize – these are low in both vitamin B3 and tryptophan
Alcoholics – alcoholics depend upon alcohol for their diet due to damage caused to the digestive system. Alcoholics are usually deficient in many other things too.
People with eating disorders or on fad diets
People with Hartnup's disease – a genetic disease where people cannot absorb tryptophan in their diet.
People which carcinoid syndrome – a syndrome which appears due to many tumours of specific cells in the digestive system. Here, tryptophan is not converted to vitamin B3 correctly.