I'm excited for meat alternatives, but have 3 thoughts on them that I haven't seen mentioned yet (I'm 42):<p>* Nearly all of the rangeland and high desert in the western US was destroyed by cattle and sheep grazing over the past 150 years. This is a billion dollar industry with the emotional buy-in of millions of people so I'm skeptical that it will be reformed in our lifetimes.<p>* My digestive system got wrecked trying to be on a mostly vegetarian diet over several years after the housing bubble popped. The gist of it is that the lectins (and other defense mechanisms in the husks) of legumes and nightshades disrupt the mucus lining of the intestines, which leads to leaky gut and stool getting into the body cavity and blood (leaky gut), which may lead to autoimmune diseases like colitis and arthritis. Something about animal protein heals this lining, probably because humans evolved as scavengers eating leftover kills and carrion from top predators.<p>* I have not yet seen studies comparing the healing and regenerative properties of meat compared to plant protein, especially concerning bodybuilding. In my own experience, there is simply no comparison between the two. Beef, eggs, salmon, tuna, turkey and chicken simply dwarf any gains obtained from bean burritos (I wish this wasn't the case). I don't know a solution to this, although I'm guessing that a portion of the gains are hormonal. Maybe someone can isolate the animal compounds and make supplements similar to creatine, BCAAs, glutamine, taurine, etc.<p>Not to knock current meat alternatives, but I view them sort of like compact fluorescent light bulbs, as a 10 or 20 year stopgap until we have true test tube meat (LED bulbs).<p>In order for meat alternatives to compete with meat, someone will need to reform the federal food subsidies that keep meat an order of magnitude cheaper than it should be. An impossible burger should cost LESS than beef, not more.