White meat carries danger to the environment, the only good thing chicken, and other white meats can provide is protein which most people get enough from veg any way, so its unnecessary, just damage to the environment for nothing.
Most vegans or vegetarians don't even have to take supplements? I don't and I am healthier then I have ever been? I believe a vegan/ vegetarian diet is much more healthy, I am living proof. I lost over 10 pounds when I went vegan, I wasn't fat but I had unnecessary fats from meat, and cheese or dairy products. I also used to have really bad acne since I went vegan my face is basically clear? I cba putting in the 100's of points and studies that show the benefits of being vegan, but you should research because you don't know a lot. Even my dad (and most meat eaters) who eats a ton of meat says he knows a vegan diet is healthier, it cuts out all the fats and stuff you do not need.
Thank you for agreeing on the red meat, and while poultry, fish are not nearly as bad to the environment they do still cause damage. For example factory poultry manure contains heavy metals. The 5,100 tons of poultry manure produced daily in Arkansas dumps into the environment, each day, 3,100 pounds of manganese, 3,300 pounds of iron, 540 pounds of copper, 3,600 pounds of zinc, and 300 pounds of arsenic. Arsenic is "a known carcinogenic agent that when inhaled can cause cancer in humans, particularly lung cancer". Factory poultry manure exposes fish, humans, and wildlife to diseases not normally found in the environment. When earthworms ingest soil containing chicken droppings infected with the cecal worm larvae that carry blackhead disease, wild turkeys, grouse, quail and other wild birds who eat these worms get sick and die.
Fish are not necessarily bad for the environment, however the damage it does can be seen on this website
http://inhabitat.com/35-facts-that-will-make-you-never-want-to-eat-fish-again/ .
Lastly you say "its nature", how is "nature" animals living in crowded factory farms being abused continuously. Baby calfs get ripped away from their mothers and killed while the mother milk (thats meat to feed her baby not us, were not baby cows???) is stolen from her. Chicken get put in the tiniest cages where they have to actually crush each other to move around while they are given drugs so that they grow bigger so that humans have more to eat. While they are in these cages their eggs are taken and chickens are meant to lay 12 eggs per year but because humans just needed more for no reason (eggs literally are not healthy at all btw) they have been genetically modified to lay 300 eggs. Theres so much more I could write, but I would like to ask how is it nature? A lion for example is a carnivore has to eat animals to survive, they go out hunt their food and eat it all themselves, that is nature. Humans doing all of that is not nature its unnecessary abuse and it is cruel. Watch videos if you don't believe it, theres evidence. I bet you or many other meat eaters would go out find a cow and kill it with your bare hands and eat it raw like a lion? No because its not our 'nature'.
And personally I actually don't kill spiders, I release them outside, same goes for any bug really. And if I step on an ant by accident which isn't that likely as they are so small they crawl through gaps and stuff that is obviously not intentional? Like if you hit an animal with your car and you didn't see it, its sad but not evil?
And you're point about the rotting meat, things rot when they are dead, we do, so do cows, pigs, fish, etc. Its been debated whether it rots in your body or not, but its dead so it is rotting before you cook it. Also you didnt answer my point about dogs, would you eat a dog? Doubt it, neither would I (obvs) but theres no difference between a dog and a pig? Sorry if I sound angry I'm not lol, didn't realise I sounded so mad