“Conceptually, food balance sheets measure the food supply of the population. In reality, they are often unable to match practice with theory and, as a consequence, the statistics are often criticized for not meeting the expectations of data users. Food balance sheets measure food consumption from a food supply perspective. They do not give any indication of the differences that may exist in the diet consumed by different population groups, e.g. people of different socio-economic groups, ecological zones or geographical areas within a country.”
https://www.fao.org/3/x9892e/X9892e01.htm?utm_source=pocket_mylist