As a step towards a fuller understanding of the food situation in Ireland on the eve of and during the great famine it is necessary to analyse the exports and imports of grain and grain products in those years.

There are a number of major obstacles to doing this. To begin with the available statistics on the Irish grain trade are neither orderly nor complete. The most extensive of the relevant series covers each calendar year during the period 1839–48. Monthly figures are available only for the year 1846 and apply to exports only. Other official returns refer to isolated periods of varying length.