the consumption of locusts , crickets , worms and grubs could become very much a part of our diet as the cost of meat production rises , and the demand for meat grows .
in tonight 's final episode of bbc two 's back in time for dinner , the robshaws -- brandon , 53 , rochelle , 52 , and their children miranda , 17 , rosalind , 15 and fred .
the robshaws sample insects in tonight 's episode of bbc two 's back for dinner .
two billion people worldwide already supplement their diet with insects .