"Egg producers are misleading consumers by writing on labels an egg size that does not correspond to the actual one. Eggs have sizes similar to those of clothes – S, M, L, XL. Some labels read L, but actually the eggs in the carton box are M-sized," Mr Naidenov told Nova TV channel in an interview today.

Another huge problem was using outdated stamps to mark the eggs instead of approved laser stamps, the Minister said.

The Sofia Echo reports that consumers must look for a bar code put on the side of the egg.

"If there is a round stamp at the bottom of the egg, this means that it has not been checked by competent bodies and its origin and store temperature are unknown and potentially dangerous to consumers' health," Mr Naidenov said.