Want more charts like these? See our charts on the secrets of the jobless recovery, the richest 1 percent of Americans, and how the superwealthy beat the IRS. How Rich Are the Superrich? A huge sh ...

Correspondence to: Dr M Stroud Institute of Human Nutrition, Mail point 113, F Level, Southampton General Hospital, Tremona Rd, Southampton, UK; m.a.stroudsoton.ac.uk ...