Low levels of vitamin B12 — You can only get vitamin B12 in substantial amounts by consuming meat, fish, eggs and dairy. Cutting out all of these foods can sometimes be problematic and contribute to vitamin B12 deficiency symptoms like fatigue, weakness and others. For this reason it’s recommended that all vegetarians and vegans who abstain from eating most or all animal foods take vitamin B12 supplements. 

Sattvic diet (also known as yogic diet), a plant-based diet which may also include dairy and honey, but excludes eggs, red lentils, durian, mushrooms, alliums, blue cheeses, fermented foods or sauces, and alcoholic drinks. Coffee, black or green tea, chocolate, nutmeg, and any other type of stimulant (including excessively pungent spices) are sometimes excluded, as well.

If you want to lose weight you should start by avoiding sugar and starch (like bread, pasta and potatoes). This is an old idea: For 150 years or more there have been a huge number of weight-loss diets based on eating fewer carbs. What’s new is that dozens of modern scientific studies have proven that, yes, low carb is the most effective way to lose weight.
Studies found that people who keep food diaries wind up eating about 15 percent less food than those who don’t. Watch out for weekends: A University of North Carolina study found people tend to consume an extra 115 calories per weekend day, primarily from alcohol and fat.  Then cut out or down calories from spreads, dressings, sauces, condiments, drinks, and snacks; they could make the difference between weight gain and loss. Here are 50 easy ways to lose weight naturally.
So how does this work? A quick run-through: The first tip was to eat low carb. This is because a low-carb diet lowers your levels of the fat-storing hormone insulin, allowing your fat deposits to shrink and release their stored energy. This tends to cause you to want to consume fewer calories than you expend – without hunger – and lose weight. Several of the tips mentioned above are about fine-tuning your diet to better this effect.
An 11-year study in Germany examined colon cancer among 1,900 vegetarians. Researchers noted fewer deaths from cancers of the stomach, colon, and lung in study participants than in the general population -- particularly among those who practiced some form of vegetarianism for at least 20 years. They suggested, however, that other factors, like body weight and amount of exercise, likely affected mortality rates in the vegetarians they studied.

According to Canon Law, Roman Catholics ages 14 and older are required to abstain from meat (defined as all mammal and fowl flesh and organs, excluding water animals) on Ash Wednesday and all Fridays of Lent including Good Friday. Canon Law also obliges Catholics to abstain from meat on the Fridays of the year outside of Lent (excluding certain holy days) unless, with the permission of the local conference of bishops, another penitential act is substituted. The restrictions on eating meat on these days is solely as an act of penance and not because of a religious objection to eating meat.[163]

Side effects of fasting include dizziness, headaches, low blood sugar, muscle aches, weakness, and fatigue. Prolonged fasting can lead to anemia, a weakened immune system, liver and kidney problems, and irregular heartbeat. Fasting can also result in vitamin and mineral deficiencies, muscle breakdown, and diarrhea. When you drink laxative concoctions during a fast, there is an increased risk of fluid imbalance and dehydration.

Vitamin B-12 is necessary to produce red blood cells and prevent anemia. This vitamin is found almost exclusively in animal products, so it can be difficult to get enough B-12 on a vegan diet. Vitamin B-12 deficiency may go undetected in people who eat a vegan diet. This is because the vegan diet is rich in a vitamin called folate, which may mask deficiency in vitamin B-12 until severe problems occur. For this reason, it's important for vegans to consider vitamin supplements, vitamin-enriched cereals and fortified soy products.

"When going out for fast food, I used to get the large-size value meal. Now, I satisfy a craving by ordering just one item: a small order of fries or a six-piece box of chicken nuggets. So far, I've shaved off 16 pounds in seven weeks, and I'm on track to being thinner than my high school self for my 10-year reunion later this year." —Miranda Jarrell, Birmingham, AL

Individuals sometimes label themselves "vegetarian" while practicing a semi-vegetarian diet,[9][42][43] as some dictionary definitions describe vegetarianism as sometimes including the consumption of fish,[8] or only include mammalian flesh as part of their definition of meat,[8][44] while other definitions exclude fish and all animal flesh.[11] In other cases, individuals may describe themselves as "flexitarian".[42][45] These diets may be followed by those who reduce animal flesh consumed as a way of transitioning to a complete vegetarian diet or for health, ethical, environmental, or other reasons. Semi-vegetarian diets include:

The simplest definition of vegetarianism is a diet free of meat, fish, and fowl flesh. But eating habits of vegetarians cover a wide spectrum. At one end are lacto-ovo vegetarians, who avoid animal flesh but eat eggs and milk products. At the other end are vegans, who forgo eating (and often wearing) all animal-based products, including honey. Raw foodists are vegans who eat mainly raw fruits, vegetables, legumes, sprouts, and nuts.
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]

If you eat your dinner restaurant style on your plate rather than family style, helping yourself from bowls and platters on the table, you’ll lose weight. Most of us tend to eat an average of 150 percent more calories in the evening than in the morning. You’ll avoid that now because when your plate is empty, you’re finished; there’s no reaching for seconds.
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.
Additionally, vegetarian diets eliminate processed meats, which are also considered carcinogenic. These include foods like packaged cold cuts, hot dogs, salami and cured meats. On the other hand, plant-based proteins offer amino acids (the specific types and amount differs from food to food) in addition to fiber and antioxidants, but without the carcinogenic effects.
"Amritdharis" that belong to some Sikh sects (e.g. Akhand Kirtani Jatha, Damdami Taksal, Namdhari[202] and Rarionwalay,[203] etc.) are vehemently against the consumption of meat and eggs (though they do consume and encourage the consumption of milk, butter and cheese).[204] This vegetarian stance has been traced back to the times of the British Raj, with the advent of many new Vaishnava converts.[200] In response to the varying views on diet throughout the Sikh population, Sikh Gurus have sought to clarify the Sikh view on diet, stressing their preference only for simplicity of diet. Guru Nanak said that over-consumption of food (Lobh, Greed) involves a drain on the Earth's resources and thus on life.[205][206] Passages from the Guru Granth Sahib (the holy book of Sikhs, also known as the Adi Granth) say that it is "foolish" to argue for the superiority of animal life, because though all life is related, only human life carries more importance: "Only fools argue whether to eat meat or not. Who can define what is meat and what is not meat? Who knows where the sin lies, being a vegetarian or a non-vegetarian?"[200] The Sikh langar, or free temple meal, is largely lacto-vegetarian, though this is understood to be a result of efforts to present a meal that is respectful of the diets of any person who would wish to dine, rather than out of dogma.[199][200]
Protein helps maintain healthy skin, bones, muscles and organs. Eggs and dairy products are good sources, and you don't need to eat large amounts to meet your protein needs. You can also get sufficient protein from plant-based foods if you eat a variety of them throughout the day. Plant sources include soy products and meat substitutes, legumes, lentils, nuts, seeds, and whole grains.

Research funded by the U.S. National Institutes of Health has shown that the average Adventist in California lives 4 to 10 years longer than the average Californian. The research, as cited by the cover story of the November 2005 issue of National Geographic, asserts that Adventists live longer because they do not smoke or drink alcohol, have a day of rest every week, and maintain a healthy, low-fat vegetarian diet that is rich in nuts and beans.[166][167] The cohesiveness of Adventists' social networks has also been put forward as an explanation for their extended lifespan.[168] Since Dan Buettner's 2005 National Geographic story about Adventist longevity, his book, The Blue Zones: Lessons for Living Longer From the People Who've Lived the Longest, named Loma Linda, California a "blue zone" because of the large concentration of Seventh-day Adventists. He cites the Adventist emphasis on health, diet, and Sabbath-keeping as primary factors for Adventist longevity.[169][170]

^ Jump up to: a b c "Vegetarians don't eat fish, shellfish or crustacea, but they can still enjoy one of the healthiest diets available". Vegetarian Society. Archived from the original on March 4, 2016. Retrieved March 18, 2018. Many things have changed since the Vegetarian Society was founded way back in 1847, but fish have always been cold-blooded water dwelling animals and vegetarians do not eat animals.
Fancy coffee drinks from trendy coffee joints often pack several hundred calories, thanks to whole milk, whipped cream, sugar, and sugary syrups. A cup of regular coffee with skim milk has just a small fraction of those calories. And when brewed with good beans, it tastes just as great. You can also try nonfat powdered milk in coffee. You’ll get the nutritional benefits of skim milk, which is high in calcium and low in calories. And, because the water has been removed, powdered milk doesn’t dilute the coffee the way skim milk does. Here are 11 metabolism myths you have to stop believing. 

Make sure that everything you're eating is whole — as in nothing processed or packaged. Since salt is a preservative, these are the foods that are highest in sodium — something to keep in mind when planning your meals. Plan on making sure that all items you choose are fresh. That means filling up on fresh fruits and veggies, whole grains, low-fat dairy, and lean protein.
The tenets of Sikhism do not advocate a particular stance on either vegetarianism or the consumption of meat,[196][197][198][199] but leave the decision of diet to the individual.[200] The tenth guru, Guru Gobind Singh, however, prohibited "Amritdhari" Sikhs, or those that follow the Sikh Rehat Maryada (the Official Sikh Code of Conduct)[201] from eating Kutha meat, or meat which has been obtained from animals which have been killed in a ritualistic way. This is understood to have been for the political reason of maintaining independence from the then-new Muslim hegemony, as Muslims largely adhere to the ritualistic halal diet.[196][200]
The main advantage of the low-carb diet is that it causes you to want to eat less. Even without counting calories most overweight people eat far fewer calories on low carb. Sugar and starch may increase your hunger, while avoiding them may decrease your appetite to an adequate level. If your body wants to have an appropriate number of calories you don’t need to bother counting them. Thus: Calories count, but you don’t need to count them.
Similarly, children under age 5 who are reared on vegetarian and vegan diets can suffer impaired growth. That's because of the potential for a vitamin B12 deficiency, which can also result in anemia and vitamin D deficiency which can cause rickets. DHA, an omega-3 fatty acid found mostly in fish, is important for optimal brain development the first 2 years of life. Consult a registered dietitian who can help design a well-planned diet that can meet all the nutritional needs.
^ Jump up to: a b c "Vegetarians don't eat fish, shellfish or crustacea, but they can still enjoy one of the healthiest diets available". Vegetarian Society. Archived from the original on March 4, 2016. Retrieved March 18, 2018. Many things have changed since the Vegetarian Society was founded way back in 1847, but fish have always been cold-blooded water dwelling animals and vegetarians do not eat animals.
Thirty-nine Reasons Why I Am a Vegetarian (1903) The Benefits of Vegetarianism (1927) Diet for a Small Planet (1971) Moosewood Cookbook (1977) Fit for Life (1985) Diet for a New America (1987) The Sexual Politics of Meat (1990) The China Study (2004) Raw Food Made Easy for 1 or 2 People (2005) Skinny Bitch (2005) Livestock's Long Shadow (2006) Eating Animals (2009) The Kind Diet (2009) Why We Love Dogs, Eat Pigs, and Wear Cows (2009) Eat & Run (2012) Meat Atlas (annual)

^ Jump up to: a b c Forrest, Jamie (December 18, 2007). "Is Cheese Vegetarian?". Serious Cheese. Serious Eats. Archived from the original on March 18, 2018. Retrieved March 18, 2018. Some vegetarians are OK eating cheeses made with animal rennet, but many will seek out ones made with vegetarian rennet, especially since the latter are quite prevalent nowadays.

High amounts of phytic acid — Some grains, beans and legumes, such as raw soybeans, lentils and mung beans, may contain trypsin inhibitors and other “antinutrients” that can make digestion difficult and hinder nutrient absorption. These inhibitors can block key digestive enzymes, and phytic acid found in grains can keep you from absorbing calcium, magnesium, iron and zinc. However, soaking and sprouting your grains and legumes can greatly reduce phytic acid.