Jeffrey Salazar
Vegetarian diets are often described by what is omitted from them, such as meat, fish, or dairy products. While plant-based diets are considered healthier, they need to be balanced and diverse to provide the right amount of nutrients daily for a healthy life. Vegetarians and vegans may be at risk of vitamin B12, vitamin D, iron, zinc, and calcium deficiencies as these micronutrients are mostly found in animal foods. Protein intake is also lower in people following plant-based diets compared to meat-eaters, although it is still within the recommended intake levels.
Characteristics and values of vegetarian diets
| Characteristics | Values |
|---|---|
| Nutritional adequacy | When appropriately planned and including fortified foods, a vegetarian diet can be nutritionally adequate for adults and children and can promote health and lower the risk of major chronic diseases. |
| Diversity of dietary practices | Vegetarians exhibit a wide diversity of dietary practices, often described by what is omitted from their diet, such as meat, fish, or dairy. |
| Nutrient deficiencies | Vegetarians may be at risk of deficiencies in vitamin B12, vitamin D, iron, zinc, calcium, omega-3 fatty acids, and protein. |
| Health benefits | Vegetarian diets are typically lower in saturated fat and cholesterol and higher in dietary fiber and health-promoting phytochemicals. |
| Nutritional concerns | Proper diet planning is essential to ensure adequate nutrient intake, especially for pregnant and lactating women and children under age 5, as deficiencies can have adverse health effects. |
| Protein sources | Pulses, eggs, tofu, mycoprotein, textured vegetable protein, nuts, and meat alternatives are important protein sources for vegetarians. |
| Iron sources | Eggs, fortified cereals, dried fruits, nuts, beans, legumes, and fortified whole wheat bread can provide iron for vegetarians. |
| Calcium sources | Dairy products, dark green leafy vegetables, tofu, almonds, calcium-fortified juices and non-dairy beverages, and soy products are good sources of calcium. |
| Vitamin B12 sources | B12 supplements, fortified cereals, and veggie burgers can help vegetarians meet their vitamin B12 requirements. |
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What You'll Learn
Vegetarian diets can lack vitamin B12
Vegetarian diets can be highly nutritious and beneficial for health and the environment. However, they can also lack certain nutrients, including vitamin B12, which is mainly found in animal-based products such as meat, milk, eggs, and fish. Vitamin B12 is essential for vital bodily functions, including the formation of blood cells and nerve function. While it is possible to get sufficient vitamin B12 on a vegetarian diet, it may require careful planning and supplementation.
Vitamin B12 is crucial for maintaining a healthy body, and deficiency can lead to serious health issues. Symptoms of vitamin B12 deficiency include fatigue, lack of energy, tinnitus, breathlessness, and loss of appetite. A deficiency during pregnancy and early development can have even more severe consequences. Therefore, it is important for vegetarians, especially pregnant or breastfeeding women, to ensure they are getting enough vitamin B12.
The main sources of vitamin B12 for vegetarians include dairy products, eggs, and B12-fortified foods. Dairy products such as milk, cheese, and yoghurt are good sources of vitamin B12 and other essential nutrients like protein, calcium, and vitamins A and B12. Eggs are also a reliable source of B12 and are high in protein, which may be lacking in some vegetarian diets. Fortified foods, such as breakfast cereals and plant-based dairy alternatives, are another practical way to increase B12 intake.
However, it is important to note that not all plant-based dairy alternatives are fortified with B12, so checking the packaging is essential. Additionally, some fortified cereals may be high in added sugar, so choosing a low-sugar option is important. Overall, while it is possible for vegetarians to get enough vitamin B12, it requires careful planning and supplementation to ensure adequate intake and avoid potential health risks associated with deficiency.
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Iron is more easily absorbed from meat
Vegetarian diets can be lacking in certain nutrients that are commonly found in meat, such as iron. Iron is an essential mineral that serves important functions in the body, and many people are deficient in it.
Iron has two forms: heme and non-heme iron. Heme iron is found in meat, fish, and poultry, and is the form that is most easily absorbed by the body. In fact, you absorb up to 30% of the heme iron that you consume. On the other hand, non-heme iron is found in plant-based foods such as fruits, vegetables, and nuts, and is not as easily absorbed. You only absorb between 2 and 10% of the non-heme iron that you consume.
Heme iron improves your absorption of non-heme iron from plant foods. This phenomenon is known as the "meat factor" and is not fully understood. Non-heme iron absorption can be further limited by anti-nutrients present in plant foods, such as phytic acid. Unlike non-heme iron, heme iron absorption is not affected by the presence of anti-nutrients.
Vegetarians and vegans, especially females and those on raw food diets, are more prone to anemia than meat-eaters due to the lower absorption rate of non-heme iron. Vegetarians are also more likely to have lower iron stores than meat-eaters. To maximize iron intake, it is recommended to include meat, fish, and poultry in the diet, in addition to iron-rich plant foods and vitamin C-rich foods.
Meat sources that are particularly rich in heme iron include lean red meat, chicken, and dark turkey meat. Organ meats such as liver are also high in iron, with a 3.5-ounce serving of beef liver containing 6.5 mg of iron, or 36% of the daily value.
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Vegetarians may need to supplement creatine
Vegetarian diets can be lacking in certain nutrients that are typically found in meat, poultry, and fish. For example, vitamin B12, vitamin D, omega-3 fatty acids, calcium, iron, and zinc are all nutrients that can be lacking in a vegetarian diet. One study found that a lacto-ovo-vegetarian diet for 26 days caused a significant decrease in muscle creatine levels.
Creatine is a bioactive compound that is lacking in plant-based diets because it is naturally found in animal tissue. Vegetarians and vegans can only get creatine from supplements, and these are available online and in stores. Creatine is not just for bodybuilders; it is for anyone looking to boost strength and power through high-intensity workouts. Studies show that creatine helps people lift more, recover faster, and build muscle quicker. It has also been shown to boost memory, attention, and overall brain function.
However, whether a vegetarian might benefit from creatine supplementation depends on their physical activity level. Anaerobic exercise, including strength and resistance training, requires short bursts of energy, which can be optimized through creatine supplementation. On the other hand, a vegetarian who engages primarily in endurance activities might not need creatine supplementation unless paired with activities requiring short bursts of energy, such as sprinting or jumping. Additionally, a person who does not regularly exercise likely does not need creatine supplementation.
While vegetarians may need to supplement creatine, it is important to note that most creatine supplements are vegan-friendly and can be successfully incorporated into a plant-based diet. To verify whether a creatine supplement is vegan, check the product labels for claims or certifications like "Vegan", "Vegetarian", or "Plant-Based". It is also important to double-check the ingredient list for any animal-derived ingredients and ensure that the capsule is gelatin-free if choosing a capsule formulation.
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Omega-3 fatty acids are found in fish and seafood
Omega-3 fatty acids are considered "healthy fats" that are essential for humans as they perform important functions in the body and may support heart health. They are polyunsaturated fats that cannot be produced by the body in the required amounts and, therefore, need to be consumed through dietary sources.
Fatty fish and seafood are good sources of omega-3 fatty acids. Fish is also a good source of protein and, unlike fatty meat products, it is not high in saturated fat. Fatty fish such as salmon, mackerel, sardines, anchovies, herring, bluefin tuna, oysters, and mussels are high in omega-3 fatty acids. The American Heart Association recommends including fish in one's diet as it is consistently associated with a lower risk for cardiovascular disease.
Vegetarians may have a more challenging time obtaining omega-3 fatty acids as they are mainly found in fish and seafood, although they are also present in microalgae, which is a suitable dietary source for vegetarians and vegans. A vegetarian diet may require careful planning to ensure it is nutritionally adequate, especially for children, pregnant women, and those who are breastfeeding. It is important for vegetarians to ensure they are consuming enough iron, vitamin B12, and omega-3 fatty acids.
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Calcium deficiency is a risk for vegetarians
Vegetarian diets are often described by what they omit rather than what they include. When a vegetarian diet is well-planned and includes fortified foods, it can be nutritionally adequate and promote health. However, it can also lead to a deficiency in some specific nutrients, such as calcium, which is generally consumed in the form of dairy products and meat.
Lacto-vegetarians, who include dairy products in their diet, do not have a risk of calcium deficiency. Vegans, on the other hand, consume substantially less calcium than other vegetarians and omnivores. Dairy products are an important source of calcium, and while some plant-based foods contain a good amount of absorbable calcium, it is still recommended that vegetarians ensure an adequate intake of calcium through supplements, natural and fortified foods, and an adequate intake of protein, fruit, and vegetables.
Vegetarians are more prone to anemia than meat-eaters due to the absence of heme iron in their diets, which is found only in meat, especially red meat, and improves the absorption of non-heme iron found in plant foods. Vegetarians also tend to have lower iron and vitamin B12 stores, and lower carnosine in their muscles, which is important for muscle function.
Overall, a well-planned vegetarian diet can provide adequate nutrition for adults and children, but it is important to be mindful of potential nutrient deficiencies and take steps to avoid them.
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Frequently asked questions
Vegetarian diets can be lacking in certain nutrients that are found in meat and animal products, such as vitamin B12, vitamin D, iron, zinc, and calcium. However, with proper planning, a vegetarian diet can be nutritionally adequate for adults and children.
Nutrients that are typically lacking in a vegetarian diet include:
- Vitamin B12: Found naturally only in animal products, vitamin B12 is important to include in a vegetarian diet to prevent anemia, muscle weakness, and neurological issues.
- Vitamin D: Known as the "sunshine vitamin," vitamin D can be obtained through exposure to sunlight, but it is also found in animal-derived foods.
- Iron: While iron is present in plant foods, it is in the form of non-heme iron, which is not absorbed as efficiently as heme iron, found in meat.
- Zinc: Zinc is another nutrient that is mostly found in animal foods and may be lacking in a vegetarian diet.
- Calcium: Calcium is important for bone health, and vegetarians can obtain it from dairy products or fortified non-dairy alternatives, while also including dark green leafy vegetables.
Vegetarians can ensure they get enough nutrients by focusing on a diverse and balanced diet. This includes eating a variety of plant-based protein sources, such as pulses, tofu, eggs, and nuts, as well as iron-rich foods like fortified cereals, soy-based foods, and dark green leafy vegetables. Calcium can be obtained from dairy products or fortified non-dairy alternatives, while vitamin B12 supplements or fortified foods may be beneficial to prevent deficiencies.
Yes, pregnant and breastfeeding women who follow a vegetarian or vegan diet should be particularly mindful of their nutrient intake. Vitamin B12, vitamin D, and calcium deficiencies during this time can impact the health of both the mother and the infant. It is important to consult a registered dietitian to ensure that the dietary needs of both mother and child are met.
A vegetarian diet can offer several benefits. It tends to be lower in saturated fat and cholesterol, while providing a good source of dietary fiber, phytochemicals, and certain vitamins and minerals. Additionally, a well-planned vegetarian diet has been associated with a reduced risk of major chronic diseases and improved health outcomes.
