Brenda Khan
Vegetarianism is an umbrella term that covers a variety of diets, including veganism, which is a plant-based diet that excludes all animal products. A vegetarian diet can be a healthy choice and is associated with a reduced risk of chronic diseases, lower cholesterol, lower blood pressure, and a lower body mass index. Vegetarians tend to consume less saturated fat and cholesterol and more vitamins, fibre, and phytochemicals. However, some nutrients, such as protein, iron, calcium, zinc, vitamin B12, and vitamin D, can be harder to obtain on a vegetarian diet, and special care must be taken during pregnancy and breastfeeding. While a vegetarian diet can meet all of a person's nutritional needs, it requires careful planning to ensure a balanced and varied diet.
| Characteristics | Values |
|---|---|
| Definition | A vegetarian diet is one that does not include meat or seafood. |
| Types | Lacto-ovo-vegetarian, Lacto-vegetarian, Ovo-vegetarian, Vegan, Pescetarian, Flexitarian |
| Health Benefits | Lower cholesterol and blood pressure, reduced risk of chronic diseases, lower body mass index (BMI), reduced risk of certain cancers, reduced risk of heart disease, type 2 diabetes, and obesity |
| Nutritional Concerns | Protein, Iron, Calcium, Zinc, Vitamin B12, Vitamin D |
| Tips for Transitioning | Learn about required nutrients and their sources, seek recipes and tips from vegetarian resources, make a meal plan, consider a gradual transition |
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What You'll Learn
Nutritional requirements
A vegetarian diet can meet all of a person's nutritional needs if it is well-planned and includes a variety of fruits, vegetables, whole grains, and nuts. However, there are some nutrients that may be lacking in a vegetarian diet, and special care must be taken during pregnancy, breastfeeding, and with children on vegetarian diets, especially vegan diets.
Protein is one of the main concerns in a vegetarian diet. Lacto-ovo vegetarians can easily obtain the recommended daily amount of protein from dairy products and eggs. Vegans can meet their protein needs by consuming plant sources such as peas, beans, lentils, chickpeas, seeds, soy products, and whole grains.
Vitamin B12 is another important nutrient that is only found in animal products. Vegetarians who regularly consume eggs and dairy products likely get enough vitamin B12, but vegans may need to eat foods fortified with vitamin B12 or take supplements to avoid deficiency. Vitamin B12 is essential for growth, repair, and overall health, and its absorption decreases with age, so supplements may be needed by older people on a vegetarian diet.
Vegetarians may also need to pay attention to their intake of iron, calcium, zinc, and vitamin D. Iron can be obtained from starchy foods, green leafy vegetables, and pulses, while calcium can be found in dairy products, dairy alternatives, green leafy vegetables, tofu, and bread. Vitamin D is produced by the body after exposure to sunlight, and small amounts are present in some foods.
Overall, a vegetarian diet can be a healthy choice and may provide benefits such as a reduced risk of chronic diseases, lower cholesterol, and lower blood pressure. However, it is important to plan meals carefully and include a variety of ingredients to ensure all nutritional requirements are met.
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Health benefits
A vegetarian diet can be a healthy choice, offering a wide variety of nutritious foods. It can be a particularly good source of vitamins C and E, dietary fibre, folic acid, potassium, magnesium, and phytochemicals (plant chemicals) such as carotenoids and flavonoids. Vegetarians tend to consume less saturated fat and cholesterol, and as a result, have lower total and LDL (bad) cholesterol, lower blood pressure, and a lower body mass index (BMI). This is associated with longevity and a reduced risk of chronic diseases such as heart disease, type 2 diabetes, obesity, and certain cancers.
A well-planned vegetarian diet can meet all of a person's nutritional needs during all stages of life. However, some nutrients can be harder to obtain, such as protein, iron, calcium, zinc, and vitamins B12 and D. Lacto-ovo vegetarians, who consume dairy and eggs, can generally get enough protein and vitamin B12 from these sources. Vitamin B12 is only found in animal products, so vegans may need to eat B12-fortified foods or take supplements to avoid deficiency. Vitamin D is also important for overall health and can be obtained through exposure to sunlight.
Vegetarians should ensure they eat a variety of fruits, vegetables, whole grains, and nuts, while avoiding saturated fats and watching their calorie and portion intake. It is also important to be physically active. A gradual transition to a vegetarian diet may be beneficial to avoid temporary digestive problems caused by sudden increases in the consumption of beans or vegetables.
Overall, a vegetarian diet can be a healthy choice, but it requires thoughtful planning to ensure all nutritional needs are met.
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Cancer risks
Vegetarian diets are becoming increasingly popular, and some evidence suggests that they may be associated with a lower risk of cancer overall. However, it is important to note that the evidence for specific cancer types is limited, and more research is needed to fully understand the relationship between vegetarian diets and cancer risk.
Several studies have found that vegetarians have a lower risk of all cancers compared to regular meat-eaters. One study of 472,377 UK Biobank participants who were cancer-free at recruitment found that being a low meat-eater, fish-eater, or vegetarian was associated with a reduced risk of all cancer. After an average follow-up of 11.4 years, 54,961 incident cancers were identified. The study also found that low meat-eaters had a lower risk of colorectal cancer compared to regular meat-eaters.
Vegetarian diets are typically rich in fruits, vegetables, whole grains, legumes, nuts, and seeds. These plant-based foods contain phytochemicals, which are nutrients that the immune system needs to fight off diseases like cancer. Plant-based foods also contain more fiber, which can help lower cholesterol, stabilize blood sugar levels, and manage bowels, all of which can contribute to a reduced cancer risk. Additionally, vegetarians tend to consume less saturated fat and cholesterol and have lower body mass indices (BMIs), which are associated with a reduced risk of certain cancers.
However, it is important to note that simply cutting out meat or animal products does not necessarily make a diet healthy. Vegetarians and vegans should ensure they are not replacing meat with processed or unhealthy foods. While red meat is a potential risk factor for colon cancer, and vegetarians tend to have lower levels of potentially carcinogenic substances in their colons, the studies comparing cancer rates in vegetarians and non-vegetarians have shown inconsistent results.
Overall, while vegetarian diets may be associated with a reduced risk of certain cancers, it is just one aspect of a healthy lifestyle. Maintaining a balanced diet, staying physically active, managing stress, and getting recommended cancer screenings are all important components of cancer prevention and overall health.
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Vitamin B12 deficiency
Vitamin B12 is an essential micronutrient that plays a role in supporting red blood cell production, energy, metabolism, and nerve function. It is naturally synthesised by microorganisms and is not produced by plants or humans. As a result, vitamin B12 is primarily sourced from animal-derived foods, including dairy and eggs.
Vegetarians and vegans can ensure sufficient vitamin B12 intake by consuming foods fortified with vitamin B12, such as certain soy and rice beverages, breakfast cereals, and plant-based meat alternatives. Additionally, supplements are an easy and effective way to prevent vitamin B12 deficiency. This is especially important for women of childbearing age, as vitamin B12 plays a crucial role in child development, and deficiency during pregnancy can have adverse effects.
It is worth noting that some plant-based foods, such as seaweed, spirulina, and fermented products like tempeh and miso, contain substances chemically similar to vitamin B12. However, these substances do not function in the same way as the active vitamin in the body, so they cannot be relied upon as sources of vitamin B12.
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Types of vegetarian diets
Vegetarian diets have gained popularity, especially in recent years, with people adopting them for various reasons, including health, environmental, ethical, religious, or economic factors. The diets take many forms, varying in which foods they include and exclude. Here are some of the most common types of vegetarian diets:
Lacto-ovo-vegetarian
Lacto-ovo-vegetarians do not eat meat, poultry, seafood, or fish. However, they still consume some animal products, including dairy and eggs. This is probably the most popular and traditional form of vegetarianism. Those who follow this diet do not condone the killing of animals for food but consider it acceptable to eat animal by-products like dairy and eggs, as long as the animals producing them are treated well.
Lacto-vegetarian
Lacto-vegetarians eat primarily plant-based foods but also consume dairy products, such as milk, butter, cheese, yoghurt, and ice cream. They do not eat meat, seafood, eggs, or any animal products. Dairy provides an additional source of protein to their diet, but they need to be mindful of including plant-based iron sources as dairy is low in iron.
Ovo-vegetarian
Ovo-vegetarians generally eat plant-based foods and eggs or products containing eggs. They do not consume meat, seafood, or other animal products, including dairy. Eggs provide a valuable source of high-quality protein, long-chain omega-3 fatty acids, and vitamin B12. However, ovo-vegetarians need to ensure they replace dairy with adequate amounts of other calcium-rich foods.
Vegan
Vegan diets are the most restrictive form of vegetarianism as they exclude all animal products, including meat, poultry, fish, eggs, and dairy. They also avoid foods containing any of these ingredients. Vegan diets are high in fibre and low in saturated fat. While it is a common argument that vegan diets lack protein sources, it is possible to obtain adequate protein from tofu, tempeh, legumes, and grains.
Fruitarian
Fruitarians are generally raw vegans whose diets centre around fruit consumption, with most of their calories coming from fruit. They may consume small amounts of vegetables but typically avoid nuts due to their macronutrient content.
Pescetarian
Pescetarians do not eat meat but include seafood, dairy, eggs, and plant foods in their diet.
Flexitarian
Flexitarians mainly eat plant-based foods but occasionally consume small portions of meat and seafood, so they are sometimes called "semi-vegetarians".
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Frequently asked questions
A vegetarian diet is associated with several health benefits, including a reduced risk of chronic illnesses such as heart disease, lower cholesterol and blood pressure, and a lower body mass index (BMI). Studies also suggest that eating lots of fruits and vegetables can reduce the risk of developing certain types of cancer.
A vegetarian diet may be lacking in certain nutrients, such as vitamin B12, calcium, and protein. Vitamin B12 is only found in animal products, so those following a vegetarian diet may need to take supplements. Calcium can be found in dairy products, but for vegans, calcium is present in some vegetables like cooked kale or collard greens, or vitamin D-fortified foods. While it is possible to get enough protein on a vegetarian diet, most plant foods are not complete proteins. Soy products, quinoa, and amaranth seeds are some exceptions.
A vegetarian diet can meet all of a person's nutritional needs if planned thoughtfully. However, those with pre-existing health conditions such as diabetes, heart disease, obesity, or a gastrointestinal disorder should be especially careful and consult a dietitian. Pregnant women should also take certain supplements to meet their nutrient needs, such as folic acid, iodine, and vitamin B12.
Transitioning to a vegetarian diet can be challenging, so it is important to consult a registered dietitian to ensure you are meeting all your nutritional needs. Start by removing one meat or animal product from your diet each week and replacing it with a fruit, vegetable, whole grain, or plant-based protein. Make a meal plan that fits your schedule and budget, and stay connected with other vegetarians to exchange recipes and tips.
