Leena Watts
Vegetarianism is a diet that abstains from eating meat, poultry, and fish. However, there are many variations of the diet, with some vegetarians choosing to eat eggs and dairy products, and others avoiding all animal products, known as vegans. A well-planned vegetarian diet can be beneficial, offering essential vitamins and minerals and reducing the risk of chronic diseases. Strict vegetarianism, or veganism, can lead to vitamin B12 deficiency, so it is important to ensure a reliable source of this vitamin in the diet.
| Characteristics | Values |
|---|---|
| Definition | A strict vegetarian diet, or vegan diet, includes only plant-based foods and rejects all animal products, including meat, poultry, fish, eggs, dairy, and sometimes honey. |
| Variations | Ovo-vegetarian diets include eggs; lacto-vegetarian diets include dairy products; and lacto-ovo vegetarian diets include both. Pescetarians eat fish but no meat or poultry, and flexitarians (or semi-vegetarians) mostly eat vegetarian but occasionally consume meat. |
| Health Benefits | Vegetarian diets are associated with a reduced risk of chronic diseases, lower rates of illness and death from some degenerative diseases, lower cancer rates, and a lower risk of death from certain heart diseases. |
| Nutritional Considerations | Vegetarians should ensure they are getting enough vitamin B12, which is primarily found in animal products, and omega-3 fatty acids, which are found in oily fish. |
| Pregnancy and Breastfeeding | Special care is needed to ensure adequate nutrition during pregnancy and breastfeeding, and it is recommended that pregnant women consult with a healthcare professional and may require supplements. |
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What You'll Learn
Health benefits
A strict vegetarian diet, or vegan diet, is one that does not include any meat, seafood, dairy, eggs, and sometimes honey and gelatin. A vegetarian diet can be considered strict if it is well-planned and meets nutritional needs during all stages of life.
Reduced Risk of Chronic Diseases
A vegetarian diet is associated with a reduced risk of developing chronic illnesses. This is due to the lower consumption of saturated fats and cholesterol, and higher intake of vitamins, dietary fibre, folic acid, potassium, magnesium, and phytochemicals.
Heart Health
Vegetarians can maintain a healthy heart by consuming at least five portions of a variety of fruits and vegetables each day, reducing saturated fat intake, and limiting salt consumption. Additionally, omega-3 fatty acids, found in vegetarian sources like nuts and oils, can help maintain a healthy heart and reduce the risk of heart disease when consumed as part of a healthy diet.
Nutritional Adequacy
A well-planned vegetarian diet can meet all of a person's nutritional needs. It can provide essential nutrients such as protein, calcium, iron, zinc, and vitamins B12 and D. Good sources of protein and calcium for vegetarians include milk, dairy products, and green leafy vegetables. Pulses (beans, peas, and lentils) are low-fat sources of protein, fibre, vitamins, and minerals.
Flexibility and Accessibility
Vegetarian diets have become more appealing and accessible due to the availability of fresh produce all year round and the growing number of vegetarian dining options. The flexibility of a vegetarian diet allows individuals to make simple substitutions, such as choosing plant-based proteins or fish instead of meat, to suit their preferences and health goals.
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Nutritional requirements
A strict vegetarian diet, or vegan diet, includes plant foods and rejects all animal products, including meat, poultry, fish, eggs, and dairy. Some strict vegetarians also avoid honey.
A well-planned vegetarian diet can meet nutritional needs during all stages of life. It can offer all the essential vitamins and minerals necessary for a long and healthy life. However, it is important to ensure that a vegetarian diet includes all the essential nutrients. This is especially important for those who are pregnant, breastfeeding, or have young children.
Vegetarians are more likely to have lower iron stores than meat-eaters. It is important to include good sources of iron in the diet, such as green, leafy vegetables, beans, and lentils. Vitamin B12 is another important nutrient to consider, as it is needed for growth, repair, and general health. It is only found naturally in animal products, so vegetarians who eat eggs and dairy can obtain B12 from these sources. Vegans can obtain B12 from fortified foods, including plant-based products and breakfast cereals, as well as dietary supplements. Omega-3 fatty acids, found in oily fish, can help maintain a healthy heart and reduce the risk of heart disease. Vegetarian sources of omega-3 fatty acids include flaxseeds, chia seeds, and walnuts.
It is recommended to eat some starchy foods every day as part of a healthy, balanced diet. Starchy foods are a good source of energy and nutrients, including fibre, calcium, iron, and B vitamins. Dairy products, such as milk, cheese, and yoghurt, are good sources of protein, calcium, and vitamins A and B12. For vegans, milk alternatives such as fortified unsweetened soya, rice, and oat drinks can also provide calcium. Pulses, including beans, peas, and lentils, are a low-fat source of protein, fibre, vitamins, and minerals, and count as a portion of vegetables. Nuts and seeds are also a good source of protein and other nutrients.
To ensure a balanced diet, it is recommended to eat at least 5 portions of a variety of fruits and vegetables each day, reduce saturated fat intake, and limit salt consumption.
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Religious motivations
Vegetarianism is often adopted for religious reasons, with religions such as Hinduism, Adventism, and Spiritism preaching abstinence from meat consumption. In Indian culture, vegetarianism has been linked to the principle of non-violence towards animals, known as "ahimsa", for millennia. Jainism, a religion originating in ancient India, advocates the most comprehensive and strictest form of vegetarianism. The Ācārāṅga Sūtra from the 5th century BCE promotes Jain-vegetarianism and even forbids monks from walking on grass to avoid harming insects. The Tirukkuṟaḷ, an ancient Indian work dated before the 5th century CE, also emphasizes shunning meat and non-killing as virtues.
The earliest record of vegetarianism dates back to the 9th century BCE, promoting tolerance and non-violence towards all living beings. In ancient Greece, vegetarianism was practised by the Orphics, a religious movement, and may have been followed by the Greek teacher Pythagoras, who is known for advocating altruism. A fictionalized portrayal of Pythagoras in Ovid's Metamorphoses depicts him as a strict vegetarian, and this characterisation became widely associated with vegetarianism in early modern English literature.
Religious beliefs often align with ethical concerns about animal slaughter and the idea that consuming meat is morally inappropriate. These ethical motivations can lead to stricter dietary practices, as individuals seek to avoid any association with animal suffering. For example, some religious groups may encourage not only abstinence from meat but also the exclusion of other consumer items derived from animal products, such as clothing or cosmetics, to maintain consistency with their values.
Additionally, religious motivations can influence individuals psychologically, impacting their well-being and contentment. This psychological aspect, combined with the religious encouragement to abstain from meat, can contribute to a person's decision to adopt a strict vegetarian diet.
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Environmental impact
Environmental vegetarianism is the practice of vegetarianism motivated by the desire to create a sustainable diet, reducing the negative environmental impact of meat production.
Livestock is estimated to be responsible for around 15% of global greenhouse gas emissions, with some studies placing this figure as high as 51% when including emissions related to methane, land use, and respiration. The livestock sector is also a significant contributor to water and land use, pollution, and unsustainability. Intensive livestock farming has a detrimental impact on the environment, and the global production of meat has increased dramatically from 130 million tons in the late 1970s to an estimated 350 million metric tons in 2023. As the demand for meat is expected to continue rising, the environmental impact of meat production will likely increase unless significant changes are made.
A shift towards vegetarian or vegan diets can have a positive environmental impact by reducing emissions, water pollution, and land use. A 2023 study found that a vegan diet can reduce environmental impacts from food production by 75%, wildlife destruction by 66%, and water usage by 54%. Additionally, a 2020 study estimated that if the US reduced its meat consumption by half, diet-related greenhouse gas emissions could be cut by 35%. Similarly, a global shift towards plant-based diets could reduce greenhouse gas emissions caused by food production by up to 70% by 2050.
It is important to note that the environmental benefits of a vegetarian diet depend on the specific foods included. For example, if a reduction in beef consumption leads to an increased consumption of dairy, the environmental benefit may be minimal. Similarly, a vegetarian diet that includes out-of-season fruits or vegetables grown in high-energy-consumption greenhouses may not yield the desired reduction in emissions.
Overall, adopting a vegetarian or vegan diet can be an important tool for achieving environmental sustainability and mitigating climate change. By reducing meat consumption, individuals can lower their ecological footprint, conserve resources, and contribute to the protection of the planet.
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Variations of a vegetarian diet
Vegetarian diets are often adopted for health, environmental, or ethical reasons. A well-planned vegetarian diet can meet nutritional needs and provide essential vitamins and minerals for a long and healthy life.
There are several variations of a vegetarian diet, which can be chosen based on personal ethics and goals. The most traditional vegetarian diet is the lacto-ovo-vegetarian diet, which includes dairy products and eggs but excludes all animal-derived meats, such as beef, chicken, and fish. The prefix "lacto" refers to cow's milk and other dairy products, while “ovo” indicates the inclusion of eggs.
A stricter form of the lacto-ovo-vegetarian diet is the lacto-vegetarian diet, which includes dairy products but excludes eggs. This variation is common among followers of Jainism, Hinduism, and Buddhism, who may have religious or cultural reasons for avoiding eggs.
An even stricter variation is the ovo-vegetarian diet, which includes eggs but excludes all dairy products and any foods made with them, in addition to meat and fish.
The vegan diet is the strictest form of vegetarianism, where all animal foods are avoided, and only plant-based sources of nutrition are consumed. Vegans do not eat meat, seafood, dairy, eggs, and sometimes honey and gelatin. This diet may require particular care to ensure sufficient nutrients, especially during pregnancy, breastfeeding, and for children.
Another variation that is not strictly vegetarian but focuses on reducing animal products is the pescetarian diet. Pescetarians do not eat meat but include seafood, dairy, eggs, and plant foods in their diet. A similar variation is the flexitarian diet, where people mainly consume plant-based foods but may occasionally include small portions of meat and seafood.
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Frequently asked questions
A strict vegetarian diet, or vegan diet, involves eating plant foods and rejecting all animal products, including meat, poultry, fish, eggs, dairy, and sometimes honey.
There are several variations of a vegetarian diet, including:
- Ovo-vegetarian: includes eggs
- Lacto-vegetarian: includes dairy products
- Lacto-ovo vegetarian: includes both eggs and dairy products
- Pescatarian: includes seafood but no meat
- Flexitarian: mostly plant-based but includes small portions of meat and seafood
A well-planned strict vegetarian diet can provide many health benefits, such as a reduced risk of chronic diseases, including lower rates of heart disease and some cancers. It can also lead to a reduced risk of diabetes, high blood pressure, and metabolic syndrome.
A strict vegetarian diet may be lacking in certain nutrients, such as vitamin B12, vitamin D, iron, and omega-3 fatty acids. Vitamin B12, in particular, is not generally present in plants but is found naturally in animal products. However, vegetarians who include dairy and eggs in their diet can obtain sufficient B12.
Yes, a strict vegetarian diet can be safely followed during pregnancy and breastfeeding, but extra care must be taken to ensure adequate nutrient intake. Most women will need supplements of certain nutrients, such as folic acid and iodine.
