I read a few comments but glossed over most of them since they are mostly wrong.
1. From an evolutionary perspective humans are designed to eat meat and thrive on it.
Look at the research of Eaton, Cordain, Weston A Price, and any anthropology textbook.
2. The 'everyone eat lots of plants and live like a veggie' is a new idea and in history has only previously be used for spiritual purposes. Traditional Chinese medicine and Ayurveda both recognise the healing power of meats. I note these traditions since it is medicine based in large part on food, they have thousands of years of empirical observations behind them and a lot of wisdom in them.
3. Meat is very nutrient dense. The two most nutrient dense foods are Beef liver and Oysters. Check out Mat Lalonde's work on this if you dispute it.
https://www.youtube.com/watch?v=HwbY12qZcF4
4. Meat is also a complete protein containing all the essential amino acids.
5. Quoting a series of studies is a facile way to reason. Science is by nature reductionist and can be very misleading. For instance, 5% of the weight of vegetables is devoted to chemicals designed to kill you (credit Steve Fowkes). Are you going to stop eating vegetables? No, of course not. This is just to illustrate how isolating one component of food can lead to absurd conclusions. Moreover many molecules in food balance each other out, negating their effect.
Also the fact the science especially new science gets frequently overturned every few years makes it a weak way to argue.
6. Conventional raised meat is bad for you, and this can account for the large amount of data 'against' meat.
- fed on grain, which increases saturated fat and omega 6s, and decreases monounsaturated fat
- fed on moldy grain which leads to animals storing mycotoxins in their fat, which we then eat
- many cows are diabetic before they are slaughtered, they fed them expired candy
- Growth hormone and antibiotics routinely used in the US, these also get stored in the animals fat, which we then eat
- grain fed meat is lower in nutrients across the board (vitamins, CLA, etc.)
- when meat is cooked at higher temperatures (meat today is mostly consumed like this) it forms carcinogenic compounds (note meat was not traditionally ate like this, it was normally stewed)
7. Animals foods are basically the only sources of bio available B12. Yes I am sure there is some obscure algae you can get B12 from but is it bioavailable? And, even if it is the fact that it is so obscure indicates this was not the traditional (evolutionary) source of B12 for humans.
Please note, im not saying everyone has to eat loads of meat. Some people do better with less, others with more, we are all biochemically individual. (of course the meat has to be grass fed/ organic and properly prepared to be healthy).
However, almost everything wrote in the field of health has a terrible bias:
Person tries diet X. Diet X makes them feel good.
Then, they 'look' at the research and 'find' that diet X is scientifically supported.
Finally, they tell everyone else you need to eat diet X, diet X is the holy grail, the be all and end all of health and vitality.
peace, love and happiness
joe