Mich. Comp. Laws § 289.7117
Hamburger or ground beef consists of fresh beef meat that has been comminuted and shall be identified as either hamburger or ground beef. Hamburger shall not contain more than 30% of fat. Ground beef shall meet the same requirements as hamburger except that it shall not contain more than 20% of fat. Monosodium glutamate may be added if declared. Hamburger may contain added beef fat, but ground beef shall not contain added fat. Ground beef and hamburger shall not contain added water or ice. Only ground beef may be qualified by the name of a particular cut of meat, such as "ground beef round" or "ground beef chuck". If so qualified, it shall consist entirely of meat from the particular meat cut and be certified as that specific cut by a method of certification as the director may establish by rule. Hamburger or ground beef shall not contain by-products or variety meats, binders, extenders, artificial color, vegetable coloring, chemical preservative, boric acid or borates, sulphites, sulfur dioxide, or sulphurous acid. No other parts of the animal or any other substance except as otherwise provided in this subsection is permitted in hamburger or ground beef.
MCL 289.7117