Following the Christianization of the Roman Empire in late antiquity, vegetarianism practically disappeared from Europe, as it did elsewhere, except in India.[34] Several orders of monks in medieval Europe restricted or banned the consumption of meat for ascetic reasons, but none of them eschewed fish.[35] Moreover, the medieval definition of "fish" included such animals as seals, porpoises, dolphins, barnacle geese, puffins, and beavers.[36] Vegetarianism re-emerged during the Renaissance,[37] becoming more widespread in the 19th and 20th centuries. In 1847, the first Vegetarian Society was founded in the United Kingdom;[38] Germany, the Netherlands, and other countries followed. In 1886, the vegetarian colony Nueva Germania was founded in Paraguay, though its vegetarian aspect would prove short-lived.[39]:345–358 The International Vegetarian Union, an association of the national societies, was founded in 1908. In the Western world, the popularity of vegetarianism grew during the 20th century as a result of nutritional, ethical, and—more recently—environmental and economic concerns.
Vegetarianism may be adopted for various reasons. Many people object to eating meat out of respect for sentient life. Such ethical motivations have been codified under various religious beliefs, as well as animal rights advocacy. Other motivations for vegetarianism are health-related, political, environmental, cultural, aesthetic, economic, or personal preference. There are variations of the diet as well: an ovo-lacto vegetarian diet includes both eggs and dairy products, an ovo-vegetarian diet includes eggs but not dairy products, and a lacto-vegetarian diet includes dairy products but not eggs. A vegan diet excludes all animal products, including eggs and dairy. Some vegans also avoid other animal products such as beeswax, leather or silk clothing, and goose-fat shoe polish.
Keep in mind that the initial weight lost on a fast is primarily fluid or "water weight," not fat. And when you go back to eating, any lost weight usually gets a return ticket back. Not only do most people regain weight lost on a fast, they tend to add a few extra pounds because a slower metabolism makes it easier to gain weight. Worse, the weight that is regained is likely to be all fat -- lost muscle has to be added back at the gym. 

Although zinc is found in many vegetarian foods, it is not as well absorbed as meat-based zinc. Eating plenty of zinc-rich foods can help you maximize the amount your body absorbs. Good sources include milk, cheese, whole-grain breads, nuts, soy foods, and legumes, such as chickpeas. Hummus on a whole-grain pita is one tasty snack that does the trick.
^ "FAQ: Definitions". IVU World Vegfest. International Vegetarian Union. March 8, 2013. Archived from the original on April 16, 2015. Retrieved March 18, 2018. The term 'Vegetarian' was first used around 1840 by the community closely associated with Alcott House School, near London, and they used it to refer exclusively to foods derived from plants—plus all the ethical values associated today with Veganism. [...] The word 'Vegetarian' was first formally used on September 30th of 1847 at Northwood Villa in Kent, England. The occasion being the inaugural meeting of The Vegetarian Society.
Western vegetarian diets are typically high in carotenoids, but relatively low in omega-3 fatty acids and vitamin B12.[66] Vegans can have particularly low intake of vitamin B and calcium if they do not eat enough items such as collard greens, leafy greens, tempeh and tofu (soy).[67] High levels of dietary fiber, folic acid, vitamins C and E, and magnesium, and low consumption of saturated fat are all considered to be beneficial aspects of a vegetarian diet.[68] A well planned vegetarian diet will provide all nutrients in a meat-eater's diet to the same level for all stages of life.[69]
^ Jump up to: a b OED vol. 19, second edition (1989), p. 476; Webster’s Third New International Dictionary p. 2537; The Oxford Dictionary of English Etymology, Oxford, 1966, p. 972; The Barnhart Dictionary of Etymology (1988), p. 1196; Colin Spencer, The Heretic's Feast. A History of Vegetarianism, London 1993, p. 252. The OED writes that the word came into general use after the formation of the Vegetarian Society at Ramsgate in 1847, though it offers two examples of usage from 1839 and 1842:
Vegetarian diets typically contain similar levels of iron to non-vegetarian diets, but this has lower bioavailability than iron from meat sources, and its absorption can sometimes be inhibited by other dietary constituents.[81] According to the Vegetarian Resource Group, consuming food that contains vitamin C, such as citrus fruit or juices, tomatoes, or broccoli, is a good way to increase the amount of iron absorbed at a meal.[82] Vegetarian foods rich in iron include black beans, cashews, hempseed, kidney beans, broccoli, lentils, oatmeal, raisins, spinach, cabbage, lettuce, black-eyed peas, soybeans, many breakfast cereals, sunflower seeds, chickpeas, tomato juice, tempeh, molasses, thyme, and whole-wheat bread.[83] The related vegan diets can often be higher in iron than vegetarian diets, because dairy products are low in iron.[68] Iron stores often tend to be lower in vegetarians than non-vegetarians, and a few small studies report very high rates of iron deficiency (up to 40%,[84] and 58%[85] of the respective vegetarian or vegan groups). However, the American Dietetic Association states that iron deficiency is no more common in vegetarians than non-vegetarians (adult males are rarely iron deficient); iron deficiency anaemia is rare no matter the diet.[86]
Similar to environmental vegetarianism is the concept of economic vegetarianism. An economic vegetarian is someone who practices vegetarianism from either the philosophical viewpoint concerning issues such as public health and curbing world starvation, the belief that the consumption of meat is economically unsound, part of a conscious simple living strategy or just out of necessity. According to the Worldwatch Institute, "Massive reductions in meat consumption in industrial nations will ease their health care burden while improving public health; declining livestock herds will take pressure off rangelands and grainlands, allowing the agricultural resource base to rejuvenate. As populations grow, lowering meat consumption worldwide will allow more efficient use of declining per capita land and water resources, while at the same time making grain more affordable to the world's chronically hungry."[220]
People who eat a high amount of vegetables and fruit daily tend to have the best protection against weight gain as they age. Because plant-based foods like fresh veggies and fruit are very low in calories yet are high in terms of volume and therefore take up lots of room in your stomach, they are filling and keep you from over-eating. Plant-based (or “mostly plant-based”) diets are tied to a lowered risk for obesity, lower BMI status and reduced complications related to obesity, such as heart problems or metabolic syndrome. (6)