Meat glue is an enzyme called transglutaminase. Some meat glues are produced through the cultivation of bacteria, while others are made from the blood plasma of pigs and cows, specifically the coagulant that makes blood clot.
When sprinkled on a protein, such as beef, it forms cross-linked, insoluble protein polymers that essentially acts like a super-glue, binding the pieces together with near invisible seams.
bacterial contamination of meat glued steak is hundreds of times higher than a solid piece of steak
cows are fed grains (oftentimes genetically modified grains, which make matters even worse), when their natural diet isplain grass. Grain diets create a much higher level of acidity in the animal's stomach, which E. coli bacteria need to survive.