Human-Grade or Food-Grade refers to the quality of a finished product. The term applies to a product that is legally suitable and approved for consumption by a person (“edible”).
Feed-Grade applies to a product that is not suitable for consumption by people and is only legally allowed to be fed to animals (“inedible”) because of the ingredients it contains or the way it (or its ingredients) have been processed.
Various ingredients used in many poor-quality pet foods are not fit for human consumption at all, and may include by-products, chemicals, fillers and parts from ’4D’ meats (animals which are dying, diseased, disabled or deceased). These ingredients do not have ‘edible’ because they are produced in a manner that makes them unfit for human consumption or are otherwise contaminated and unsafe for people to consume.