Does vegetarianism have a positive or negative effect on health among teenagers?

To produce one pound of beef takes 16 pounds of grains. Growing body parts which are not used for meal and production of energy by cow make 15 pounds expendage. That same pound of beef also requires on average 2,500 gallons (10,570L) of water (Lappe 1999 quoted in Kaza 2005, 390). By contrast, a pound of wheat requires only 60 gallons (254L) of water (Fiddes 1991, 215 quoted in Fox 2000, 165). Furthermore, every year 322 million liters or by another measurement 85 million gallons of waste are produced by farm animals, and most portion by cattle. While, at least 40 kg (88lbs) and 15 kg (33lbs) manure is produced to take a kilogram of esculent beef and pork accordingly (Fox 2000, 165). Also, there are many other consequences of using too much animal products. By growing the population demand for meat and dairy products are increasing. Hence, the risks caused by animals are also increasing. Beside the environmental damage, there are also health benefits of consuming fewer animal products and it protects animal rights and prevents animal cruelty. Also, people who do not eat meat or other animal products tend to not consume or easily can abandon from alcohol, drinks with caffeine and from modified foods (Phillips 2005, 136). Although meat is the national meal of Kazakh people and many think that a meal without meat is not substantial, this essay will show that a vegetarian diet might be useful for people's health and may lead to several positive environmental changes.
Several studies state that a vegetarian diet is one of common type of diet and it is becoming popular (Mahato 2011, 74; Key et al. 2006). There are hundreds of million vegetarians all over the world as a vegetarian diet is a popular choice for many individuals and families. They all have slightly different diets. Nonetheless, to be a vegetarian one has to follow certain type of vegetarian diet. Also, to call yourself vegetarian the minimum requirement is to not eat meat, therefore, one may include