A well-planned vegetarian diet is a healthy way to meet your nutritional needs. Find out what you need to know about a plant-based diet.By Mayo Clinic Staff
Vegetarian diets are popular. Reasons for following a vegetarian diet are varied but include health benefits, such as reducing your risk of heart disease, diabetes and some cancers.
Yet some vegetarians rely too heavily on processed foods, which can be high in calories, sugar, fat and sodium. And they may not eat enough fruits, vegetables, whole grains and calcium-rich foods, thus missing out on the nutrients they provide.
However, with a little planning a vegetarian diet can meet the needs of people of all ages, including children, teenagers, and pregnant or breast-feeding women. The key is to be aware of your nutritional needs so that you plan a diet that meets them.
When people think about a vegetarian diet, they typically think about a diet that doesn't include meat, poultry or fish. But vegetarian diets vary in what foods they include and exclude:
- Lacto-vegetarian diets exclude meat, fish, poultry and eggs, as well as foods that contain them. Dairy products, such as milk, cheese, yogurt and butter, are included.
- Ovo-vegetarian diets exclude meat, poultry, seafood and dairy products, but allow eggs.
- Lacto-ovo vegetarian diets exclude meat, fish and poultry, but allow dairy products and eggs.
- Pescatarian diets exclude meat and poultry, dairy, and eggs, but allow fish.
- Pollotarian diets exclude meat, dairy and fish, but allow poultry.
- Vegan diets exclude meat, poultry, fish, eggs and dairy products — and foods that contain these products.
Some people follow a semivegetarian diet — also called a flexitarian diet — which is primarily a plant-based diet but includes meat, dairy, eggs, poultry and fish on occasion or in small quantities.
The key to a healthy vegetarian diet — like any diet — is to include a variety of foods. No single food can provide all the nutrients your body needs. A registered dietitian can help you create a vegetarian diet that's right for you.
Healthy vegetarian eating pattern
||Recommended servings for 2,000-calorie/day diet
|Source: 2015-2020 Dietary Guidelines for Americans|
||2 1/2 cups a day
||1 1/2 cups a week
|Red and orange
||5 1/2 cups a week
|Legumes (beans and peas)
||3 cups a week
||5 cups a week
||4 cups a week
||2 cups a day
||6 1/2 ounces a day
||≥ 3 1/2 ounces a day
||≤ 3 ounces a day
||3 cups a day
||3 1/2 ounces a day
|Meats, poultry, eggs
||3 ounces a week (eggs)
|Nuts, seeds, soy products
||14 ounces a week
||27 grams a day
|Added sugars, solid fats, added refined starches
||No more than 290 calories a day (15% of total calories)
Keep in mind that the more restrictive your diet is, the more challenging it can be to get all the nutrients you need. A vegan diet, for example, eliminates natural food sources of vitamin B-12, as well as milk products, which are good sources of calcium.
To be sure that your diet includes everything your body needs, pay special attention to the following nutrients:
Calcium and vitamin D
Calcium helps build and maintain strong teeth and bones. Milk and dairy foods are highest in calcium. However, dark green vegetables, such as turnip and collard greens, kale, and broccoli, are good plant sources when eaten in sufficient quantities. Calcium-enriched and fortified products, including juices, cereals, soy milk, soy yogurt and tofu, are other options.
Vitamin D also plays an important role in bone health. Vitamin D is added to cow's milk, some brands of soy and rice milk, and some cereals and margarines. Be sure to check food labels. If you don't eat enough fortified foods and have limited sun exposure, you may need a vitamin D supplement (one derived from plants).
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.
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.
Omega-3 fatty acids
Omega-3 fatty acids are important for heart health. Diets that do not include fish and eggs are generally low in active forms of omega-3 fatty acids. Canola oil, soy oil, walnuts, ground flaxseed and soybeans are good sources of essential fatty acids. However, because conversion of plant-based omega-3 to the types used by humans is inefficient, you may want to consider fortified products or supplements or both.
Iron and zinc
Iron is a crucial component of red blood cells. Dried beans and peas, lentils, enriched cereals, whole-grain products, dark leafy green vegetables, and dried fruit are good sources of iron. Because iron isn't as easily absorbed from plant sources, the recommended intake of iron for vegetarians is almost double that recommended for nonvegetarians. To help your body absorb iron, eat foods rich in vitamin C, such as strawberries, citrus fruits, tomatoes, cabbage and broccoli, at the same time as you're eating iron-containing foods.
Like iron, zinc is not as easily absorbed from plant sources as it is from animal products. Cheese is a good option if you eat dairy products. Plant sources of zinc include whole grains, soy products, legumes, nuts and wheat germ. Zinc is an essential component of many enzymes and plays a role in cell division and in formation of proteins.
Iodine is a component in thyroid hormones, which help regulate metabolism, growth and function of key organs. Vegans may not get enough iodine and may be at risk of deficiency and possibly even a goiter. In addition, foods such as soybeans, cruciferous vegetables and sweet potatoes may promote a goiter. However, just 1/4 teaspoon of iodized salt a day provides a significant amount of iodine.
One way to transition to a vegetarian diet is to gradually reduce the meat in your diet while increasing fruits and vegetables. Here are a couple of tips to help you get started:
- Ramp up. Each week increase the number of meatless meals you already enjoy, such as spaghetti with tomato sauce or vegetable stir-fry. Find ways to include greens, such as spinach, kale, Swiss chard and collards, in your daily meals.
- Substitute. Take favorite recipes and try them without meat. For example, make vegetarian chili by leaving out the ground beef and adding an extra can of black beans. Or make fajitas using extra-firm tofu rather than chicken. You may be surprised to find that many dishes require only simple substitutions.
- Branch out. Scan the Internet for vegetarian menus. Buy or borrow vegetarian cookbooks. Check out ethnic restaurants to sample new vegetarian cuisines. The more variety you bring to your vegetarian diet, the more likely you'll be to meet all your nutritional needs.
March 14, 2016
- Messina V, et al. A new food guide for North American vegetarians. Journal of the American Dietetic Association. 2003;103:748.
- Vegetarian diets. American Heart Association. http://www.heart.org/HEARTORG/GettingHealthy/NutritionCenter/Vegetarian-Diets_UCM_306032_Article.jsp. Accessed April 16, 2015.
- Duyff RL. Food choices: The consumer marketplace. In: American Dietetic Association Complete Food and Nutrition Guide. 4th ed. Hoboken, N.J.: John Wiley & Sons; 2012.
- Position of the American Dietetic Association: Vegetarian diets. Journal of the American Dietetic Association. 2009;109:1266.
- Marsh K, et al. Meeting nutritional needs on a vegetarian diet. Australian Family Physician. 2009;38:600.
- 2015-2020 Dietary Guidelines for Americans U.S. Department of Health and Human Services and U.S. Department of Agriculture. http://health.gov/dietaryguidelines/2015/guidelines/. Accessed Jan. 7, 2016.
- Craig WJ. Nutrition concerns and health effects of vegetarian diets. Nutrition in Clinical Practice. 2010;25:613.
- Craig WJ. Health effects of vegan diets. American Journal of Clinical Nutrition. 2009;89:1627S.
- Vegetarian and vegan diet pyramid. Oldways Preservation Trust. http://oldwayspt.org/resources/heritage-pyramids/vegetarian-diet-pyramid/overview. Accessed April 16, 2015.
- The basics of plant food nutrition. Oldways Preservation Trust. http://oldwayspt.org/resources/heritage-pyramids/vegetarian-diet-pyramid/basics-plant-food-nutrition. Accessed April 16, 2015.
- Vegetarian diet and health. Oldways Preservation Trust. http://oldwayspt.org/resources/heritage-pyramids/vegetarian-diet-pyramid/vegetarian-diet-health. Accessed April 16, 2015.
- Colditz GA. Healthy diet in adults. http://www.uptodate.com/home. Accessed April 16, 2015.
- Healthy eating for vegetarians. U.S. Department of Agriculture. http://www.nutrition.gov/smart-nutrition-101/healthy-eating/eating-vegetarian. Accessed April 16, 2015.
- Demory-Luce D, et al. Vegetarian diets for children. http://www.uptodate.com/home. Accessed April 16, 2015.
- Le LT, et al. Beyond meatless, the health effects of vegan diets: Findings from the Adventist Cohorts. Nutrients. 2014;6:2131.
- Nelson JK (expert opinion). Mayo Clinic, Rochester, Minn. April 20, 2015.