Answer:
Meat is the only nutritionally complete food. Animal foods (particularly when organ meats are included) contain all of the protein, fat, vitamins and minerals that humans need to function.
Ingredients in processed meat:
A typical ingredient statement might list "beef, pork, water, hydrolyzed vegetable protein, salt, dextrose, corn syrup, hydrolyzed milk protein, sodium phosphate, natural spices, smoke flavoring, sodium erythorbate, sodium nitrite."