bantingism

from The Century Dictionary.

• noun A course of diet for reducing corpulence, adopted and recommended in 1863 by William Banting, a merchant of London. The dietary recommended was the use of lean meat principally, and abstinence from fats, starches, and sugars.

from the GNU version of the Collaborative International Dictionary of English.

• noun A method of reducing corpulence by avoiding food containing much farinaceous, saccharine, or oily matter; -- so called from William Banting of London.