The more complicate answer follows here:
  I care about life. I care about our children. I care about nature. I care about world hunger. I care
  about biodiversity. I care about torture to innocent creatures. I care about preventing topsoil depletion. I care
  about energy consumption. I care about the air we breathe, and the water that flows in rivers. And I care about my own
  health. I honestly believe that the most significant thing I, as an individual, can do for any one of these things I care about
  is to consume only vegetarian food.
  I believe in our world as a wonderful garden, where we can live together and love each other and all the creatures we
  share it with; - A garden of happiness.

 
What you see below does not bring happiness, nor does it fit into a wonderful garden.

  Thank you for being interested!
Human nature dislikes slaughtering and torment. Our natural instinct is not meant to kill. Do you like to watch how animals are killed (which usually is just the end of the torture)? Do you feel that you have to kill an animal, when you see it - just like predators do?
WHY VEGETARIAN ?
'Animals are my friends. And I don't eat my friends.' G. B. Shaw
The human's body is not designed to eat and digest meat. The distance between the teeth is too narrow. At school I was tought that our teeth would be comparable to the teeth of an omnivore (pig, bear...) - still, a wide-spread bromide. If you don't know how the teeth of an omnivorous look like, visit the Natural History Museum in London - it is free of charge.
Meat causes excess acidity in the humans digestive system, disturbing a healthy intestinal flora and creating a breeding ground for unfavourable organisms, such as Helicobacter pylori, directly resulting in stomach ulcer or cancer and indirectly in a dicreased metabolism.
Animal fat not only consist of useless, but also dangerous large fat molecules (saturated fats), which are responsible for a series of degenerative diseases, e.g. stroke, multiple sclerosis, heart attack, diabetes and cancer - nowadays the most common way to die.
Saturated fatty acids decrease oxygen supply to our tissues (hypoxia), choking them by making red blood cells stick together, less mobile and less able to deliver oxygen to cells (Udo Erasmus, 'Fats that Heal, Fats that Kill'). We constantly decrease our metabolism. This can be compensated by doing sports, but only to some extend. The key to perfect health is your metabolism, get your cells well supplied with oxygen and nutritions whereas waste products and poisonous substances obviously should leave the body as soon as possible. Our body is not designed to malfunction. It does everything possible to compensate our mistakes and NOT to malfunction. If we become ill, we must have made multiple mistakes, usually over a LONG PERIOD OF TIME!
Many people explain that they feel fine, eating meat ... or even "need" it, others say they feel fine smoking. They probably have never understood, how a "perfect state of health" really feels like.
Natural lactic acid bacteria (Acidophilus, Bifidus, etc.) build a protective intestinal flora, which is severely disturbed by putrefactive agents (decaying meat). Absorbtion of essential nutritions into the body is decreased and again, effects your metabolism.
Most women are convinced that the best way to prevent osteoporosis is to consume dairy products, but the well-documented fact is quite the opposite. The increased acidity because of excess protein (especially Methionin and Cystein) in meat and dairy products actually prevents calcium absorption and is a significant risk factor for osteoporosis. Excess of animal protein also is deposited in blood vessels (heart attack, stroke, arteriosclerosis).
Meat is low in fibre and gathers in intestinal pockets, where it decays and constantly emits poisonous substances.
Heavy metals and other poisonous substances caused by environmental pollution are found in much higher percentages in meat than in plants (this applies especially to predatous fish!).
If GOD meant us to eat meat, why does it effect our health in a negative way?
It is a heresay that muscle strength and speed requires a diet of meat:
An excellent
example of a great champion in swimming is Murray Rose (Australia), 3 gold medals and one world record at the 1956 Olympic Games in Melbourne, and subsequently 1 gold, 1 silver medal, and 1 world record at the 1960 Olympic Games in Rome.
Murray Rose is a
third generation lacto vegetarian. In an interview, he said that he was raised in a vegetarian family and that he never had eaten meat, fish or any food derived from killed animals. He said, that he is not just abstaining from meat, fish or fowl, but that he believes in a natural wholefood nutrition, such as vegetables, fruit, unrefined rice and wheat products, honey, high quality dairy and soja products, nuts, sesame, millet and sunflower seeds (ref. Stolzenberg, 1974).
If GOD meant us to eat meat, why was it possible for Murray to achieve his success without? There was certainly no lack of proteins! ... Only because he didn't give up milk products?
What about
Dave Scott, six times winner of the 'Iron Man' Triathlon', who is living vegan?
Still in doubt?
check this out!
My mother, Sigrid Preiss, vegetarian for over 30 years, is 60+ (*1942) and despite her age takes part in Triathlons.

The picture was taken in summer 2003.

If GOD meant us to eat meat, why is she in such good condition?
Physical tests at the Heeres-Spital, Stammersdorf (Vienna) for all 6 UN-Missions, which I had joined, proved that my results always were the best or at the very top. Dr. Faas, the senior medical for all UN examinations was in disbelieve of my heartrate (45/min) in normal condition, convinced my values only would be possible by performing serious sports.
If GOD meant me to eat meat, why do I feel damn well without??
Jesus was vegetarian.
according to the script rolls from Qumran, Jesus was follower of the Essene brothership,
raw food vegetarians who lived at the Dead Sea
(their only bread  was baked from sprouted grain - with the energy of the sun)

Pythagoras, Leonardo da Vinci, Charles Darwin, Albert Einstein were vegetarian.
"Nothing will benefit human health and increase the chances for survival on Earth as much as the evolution to a vegetarian diet." Albert Einstein.
Albert Schweitzer, Jean Jacques Rousseau, George Bernard Shaw;
Mahatma Ghandi, Benjamin Franklin, Leonin Tolstoi;
Bob Dylan, John Lennon, Sir Paul Mc Cartney,
Dustin Hoffmann, Richard Gere, Danni de Vito, Woody Harrelson, ...

Why not you as well?
People involved in killing have to override their scrupel - often as a child. My neighbour mate always left his parents farm on the slaughter day, because his innocent mind couldn't watch the final agony of the pigs. Now he kills them himself.
If it was
your pet being slaughtered - what difference would it make? Do all the cows, chicken, pigs, sheep, horses etc. who end up as a greasy sausage in a pan feel different?
Born to die - as a thing without soul? If GOD meant us to eat meat, why do we feel scrupel to kill?
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The basic answer is as simple as that:
  I believe that our natural food is what we normally would eat in it's natural, un-prepared, raw and un-salted/spiced 
  condition.
Meat production is incredibly inefficient. Growing grain, which is fed to livestock and consequently fed to humans, ends up with much less food than feeding grain and other plant products directly to humans.

Annually, an acre (0,4 ha) of land can produce 40,000 pounds (18.000 kg) of potatoes, or a paltry 250 pounds (approx. 115 kg) (!!) of beef. Hence, a vegetarian lifestyle can feed 100% more people than non-vegetarian. In other figures: Organic food could be standard for everybody, even in developing countries. It is estimated that world wide, 852 mio people do not have enough to eat and 24,000 people die because of hunger related causes every day (FAO)!

Fields so large that one can't see the end, could be history.
“I don’t eat any animals or anything that has to do with animals—no fish or egg or dairy because I personally don’t feel it’s a good practice to eat anything that might run away from you.”
--Russell Simmons
“I gave up meat when I was twelve. … One day I was cutting up a chicken for my mom, and I hit a tumor with the knife. There was [pus] and blood all over the place. That was enough for me.”
--Josh Hartnett
"I’ve always felt that animals are the purest spirits in the world. They don’t fake or hide their feelings, and they are the most loyal creatures on Earth. And somehow we humans think we’re smarter—what a joke."
--Pink
"A human can be healthy without killing animals for food. Therefore if he eats meat he participates in taking animal life merely for the sake of his appetite."
--Leonin Tolstoy
QUOTES
If slaughterhouses had glass walls, everyone would be vegetarian. We feel better about ourselves and better about the animals, knowing we're not contributing to their pain.
--Paul and Linda McCartney
I think there's something odd about eating another living anything.
--Shania Twain
Consider the benefit to your own health, to your environment and our world.
If you are still in doubt that a vegetarian or vegan diet is healthy - here are some links:


http://www.jacknorrisrd.com/articles/nutres

http://www.veganhealth.org

http://www.peta.org/