Mich. Comp. Laws § 289.7123

Sec. 7123. Meat loaf consists of comminuted meat, processed in the form of a loaf, containing not less than 65% meat. Meat loaf mix consists of meat loaf sold in bulk uncooked form. Meat loaf may contain salt, seasoning, sodium or potassium nitrate, ascorbic acid, or the salts thereof, sodium or potassium nitrite, cereal vegetables, vegetable protein, nonfat dry milk solids, soy flour, eggs or egg products, macaroni, cheese, condiments, nuts, fruits, or gelatin. Binders and extenders shall not exceed 12% of the product. To facilitate chopping or mixing, water or ice may be used in an amount not to exceed 3% of the total ingredients. Meat loaf shall not contain by-products of variety meats, artificial flavors or color, vegetable coloring, chemical preservative, boric acid or borates, sulfur dioxide, sulphites, or sulphurous acid. No other substance is permitted in meat loaf or meat loaf mix, except as otherwise provided in this section.