Meat and all animal products like milk and eggs even coming from "good" farms, are SURVIVAL FOODS. Good if you can't eat plant-based foods depending on the area you live in, like Alaska for instance, but it is INFERIOR foods in terms of quality and benefits to human health (less variety of oligo-elements and it's always dead foods that need to be cooked, pasteurized. If you eat raw meat, egg, milk, the risks of infection are too high), just good to SURVIVE but not optimal to THRIVE. Foods in nature provide all nutrients necessary to nourrish humans for OPTIMUM health, strenght, stamina and clear mind.
Animal products are also foods of SECOND CLASS, a poor choice to make for nutrition. This reasonning is based on what we call the food chain. The reason why we're on top of this chain is because we don't have any predators, not because we eat animals, should eat animals or should not eat them. Carnivorous animals in nature eat mostly animals that are vegetarians because of this natural law which is the food chain; toxins accumulates along the food chain. Therefore we should chose foods that are at the bottom of the food chain, like fruits, veggies, grains, because they're clean, no toxins accumulated, nourrished by sun, water and soil, and we should avoid foods that are right under our specie in the food chain, like fish, poultry, and their products : eggs, milk, because we find a higher level of toxic products. Fish live in polluted water. Vegans have less BPC and other highly toxic chemicals in their bodies than vegetarians and omnis. If there's chimic pesticides and insecticides sprayed on plants vegans eat, it's a much lower level of chemicals then found in animal products, because of the accumulation in their flesh with all the grains they eat during their life, all those residues goes into their eggs, milk and meat. Therefore, plant-based foods are a SUPERIOR CATEGORY of food because they are lower in the food chain.
Environmental reasons :
"According the the WorldWatch Institute (and an old post of our own) livestock contribute 18% of global greenhouse gas (GHG) emissions, even higher than the GHG emissions from transportation. As part of this figure they produce 37% of methane, which has more than 20 times the global warming potential of carbon dioxide. And if that weren’t enough to be concerned about, their manure emits nitrous oxide, 65% of world totals. WorldWatch also point out that in the United States, 70% of all anti-microbial drugs are now given to livestock."
Animal farms use 70% of all water we use. Also, all manures pollutes our water.
In their Greenhome project, the Australian Conservation Foundation (ACF) suggest that removing just one 150-gram serve of beef a week would culminate in a saving of 10,000 litres of water and 300 kilograms of greenhouse gases. (That’s 5oz, 2,642 gallons and 660 lb for our non-metric brethren.) Possibly those figures are so high because Aussies chow down on an average 110kg (243 lbs) of meat yearly.
Ethical reasons : even if taking milk and eggs from animals don't cause directly their death, it's always what awaits them, because we can't just unleash in nature billions of dairy cows and laying hens after they gave us what we wanted. They will be slaughtered anyway. Finally : one of the ten comandments : "thou shalt not kill "... Those who have no remorse are psychopaths.
common sense : Pounds of grain and soybeans needed to produce 1 pound of feedlot beef: 16