Jeffrey Salazar
Vegetarian diets are often rich in vitamins, minerals, fiber, and disease-preventing phytonutrients. Vegetarians are, however, at risk of missing out on some important nutrients, including protein, calcium, iron, vitamin D, B12, and the mineral zinc. While some people take supplements to bridge this gap, others argue that a well-planned vegetarian diet can provide all the required nutrients. For example, vegetarians can get protein from pulses, nuts, and seeds, and calcium from dark, leafy greens, soy milk, and orange juice. Vitamin B12 is the only vitamin that must be consumed from either fortified foods or supplements, as it is not commonly found in plant-based foods.
| Characteristics | Values |
|---|---|
| Vitamins and minerals that may be lacking in a vegetarian diet | Iron, vitamin B12, vitamin D, calcium, zinc, vitamin K, vitamin C |
| Recommended sources of vitamins and minerals for vegetarians | Pulses (beans, peas, lentils), nuts, seeds, eggs, dairy products, plant-based proteins (tofu, mycoprotein, textured vegetable protein, tempeh), vitamin-fortified foods (plant milk, nutritional yeast, cereals, non-dairy drinks), fruits and vegetables |
| Supplements | Multivitamins, vitamin B12, vitamin D, calcium, vitamin K, fish oil, folic acid, B6 |
| Health benefits of a vegetarian diet | Weighing less, having less body fat, reduced risk for heart disease, hypertension, type 2 diabetes, and prostate or colon cancer |
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What You'll Learn
Iron
Vegetarians and vegans are at a higher risk of iron deficiency due to the lower bioavailability of iron from plant-based sources. Heme iron, found in animal products, is generally easier for the body to absorb compared to non-heme iron, which is present in plant foods. However, this does not mean that a vegetarian diet lacks iron; it just requires a more conscious effort to ensure adequate intake.
Vegetarians can obtain iron from various plant-based sources. Dark green leafy vegetables like spinach, Swiss chard, and kale are excellent sources of iron. Legumes, such as beans, lentils, and soybeans, are also rich in iron. Whole grains, including quinoa, oatmeal, and fortified cereals, contain significant amounts of iron. Additionally, nuts, seeds, and dried fruits can contribute to iron intake. Pairing these iron-rich foods with vitamin C-rich options, like tomatoes, citrus fruits, or strawberries, can enhance iron absorption.
It is important for vegetarians to be mindful of their iron intake and include a variety of iron-rich plant-based foods in their diet. While iron supplements are available, they should be considered only if dietary sources are insufficient or if advised by a healthcare professional. Maintaining adequate iron levels is crucial for overall health and well-being.
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Vitamin B12
It is important to note that supplements are usually only required in the case of deficiencies, which can be determined through blood tests. While some vegetarians may be hesitant to take supplements, it is important to listen to your body and consult a doctor if you are concerned about a vitamin deficiency.
In addition to vitamin B12, vegetarians should also be mindful of other nutrients that may be lacking in a plant-based diet, such as protein, calcium, iron, vitamin D, and zinc. A well-planned vegetarian diet that includes a variety of beans, veggies, whole grains, nuts, and seeds can help ensure adequate intake of these nutrients.
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Omega-3
Vegetarians, and especially vegans, are at a particular risk of omega-3 deficiency. This is because the primary sources of omega-3 are oily fish such as salmon, mackerel, sardines, and cod liver oil. However, there are vegetarian-friendly sources of omega-3, including alpha-linolenic acid (ALA), which is found in plant and seed oils like flaxseed, chia seeds, walnut, and algal oil. Chia seeds, ground linseed, shelled hemp seeds, and walnuts are also good sources of omega-3.
Vegetarians can also obtain omega-3 through supplements, such as microalgae supplements, which are particularly important during pregnancy, breastfeeding, and childhood due to their role in brain, nerve, and eye development. The European Food Safety Authority (EFSA) recommends a daily intake of 250 mg of omega-3 fatty acids.
It is important to note that evidence suggests vegetarian sources of omega-3 may not have the same benefits as those in oily fish, particularly in reducing the risk of heart disease. However, vegetarians can still maintain a healthy heart by consuming a balanced diet with plenty of fruits and vegetables, less saturated fat, and reduced salt intake.
In addition to omega-3, vegetarians should also ensure they are consuming enough iron and vitamin B12, as they are at risk of having lower iron stores and B12 is only found naturally in animal products.
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Calcium
Vegetarians and vegans have been found to have a reduced intake of calcium, which can lead to a higher risk of osteoporosis and fractures. This is because a vegetarian diet is often lower in calcium and proteins, which are essential for maintaining and developing bone mass and density. Additionally, vegetarians may also have lower consumption of other nutrients such as zinc, phosphorus, and vitamin B12, which can also impact bone health.
To ensure adequate calcium intake on a vegetarian diet, it is recommended to include calcium-rich foods in your daily diet. Some plant-based sources of calcium include tofu, kale, watercress, seaweed, soybeans, and calcium-fortified foods such as plant milks, yogurts, and cereals. However, it is important to note that the amount of calcium in fortified products can vary, so it is advisable to check the nutrition labels.
If you are concerned about your calcium intake, you can also consider taking a calcium supplement. Speaking to a healthcare professional can help address any concerns and ensure that any supplements are suitable for your individual needs.
In addition to calcium intake, it is also important to consider other factors that can influence calcium absorption and retention. For example, vegetarians should be mindful of their intake of dietary constituents that decrease calcium retention, such as salt, protein, and caffeine. Adequate intake of vitamin D is also important, as this nutrient is involved in calcium absorption.
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Vitamin D
It is worth noting that calcium absorption in the body is dependent on adequate levels of vitamin D. Therefore, vegetarians who do not consume dairy products should focus on ensuring they get enough vitamin D, either through sun exposure or dietary sources, to maximize calcium absorption from dark, leafy greens like kale and broccoli.
In summary, while vitamin D is important for everyone, regardless of dietary preferences, vegetarians can meet their vitamin D needs through a combination of sun exposure and, if necessary, vitamin D-fortified foods or supplements, especially if their calcium intake is primarily from plant-based sources.
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Frequently asked questions
It is a common misconception that vegetarians need to take a lot of supplements to stay healthy. While it is true that a vegetarian diet can exclude a wide range of foods, careful planning and the addition of fortified foods can help you meet your nutritional needs.
Vitamin B12 is the only vitamin that vegetarians and vegans must consume from either fortified foods or supplements. This is because vitamin B12 is naturally produced by bacteria present in the gut of animals, and most good dietary sources of B12 come from animal products.
Fortified cereals, yeast, and some non-dairy drinks are often fortified with vitamin B12. You can also purchase vegan products that contain vitamin B12, such as plant milks, nutritional yeast, tempeh, and tofu.
Vegetarians may struggle to get enough vitamin D, vitamin K, and iron from their diets. Vitamin D can be obtained through exposure to sunlight, but this may not be sufficient depending on where you live, your skin colour, and whether you use sunscreen. Vitamin K and iron are found in plant-based sources, but they are not absorbed as well as their counterparts from animal products.
Supplements are usually only required in the case of deficiencies. The best way to know if you need to take supplements is to consult your doctor and get a blood test.
