A few years ago, proponents of grass-fed beef brushed off the E. coli threat, saying that grass-fed cows with natural digestive pH levels are not carriers of hardy O157:H7. This no longer appears to be the case.
Food scientists are a creative bunch. They can take almost any set of raw materials and create a product that resembles food in taste and appearance. We only know these products are not food by the ingredient listings on their label; these ingredient lists can be extravagantly long.
Our industrial food production system, from a free market viewpoint, works very well. Large corporate farms are always looking for a way to add efficiencies. Instead of tossing out scraps, they can be ground and re-sold as pet food. Or, they can be ground and sold as meat filler.
While I do not know what exactly goes into a Double IPA, I can tell you how it tastes: awesome. Double IPAs have a strong, medium body and the presence of sweetness (probably derived from the use of more hops). They are, for me, an ideal compromise between bitter, dark beer and light, watery beer.