acid-ash diet

n.
  1. A diet consisting largely of meat or fish, eggs, and cereals with a minimal quantity of milk, fruit, and vegetables, that when catabolized leaves an acid residue to be excreted in the urine.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.