Napoleon was on St Helena for the last 6 years of his life as a prisoner. It's likely that he didn't get the 'first pickings' of the fresh food available, which would have been the case on campaign.

St Helena is a pretty bare place when all is said and done. Less than a third of it is farmable, the majority of its produce is exported and the population is less than 6,000 over a little more than 45 square miles. For 500 years it seems to have been little more than a convenient place to get fresh water crossing the south Atlantic.

LTS