People choose to be vegetarian for ethical, cultural, or health-related reasons—and their numbers are growing in the United States.
While not all vegetarians follow a healthy diet—potato chips are vegetarian, after all—research shows vegetarianism can have many health benefits, including the potential to strengthen our immune system.
Researchers are still working out how a vegetarian diet may do this. For instance, is it the lack of meat, the emphasis on plant-based foods, both, or something more specific.
But mounting studies indicate that eating more fruits, vegetables, and legumes, as vegetarians do, can be credited for any associated health benefits.
What Do Vegetarians Eat?
Vegetarian diets are comprised of combinations of fruit, vegetables, whole grains, nuts and seeds, legumes and, for some, dairy and eggs.
There are many types of vegetarian eating patterns, from vegan (no animal products) through to lacto-ovo (some animal products such as eggs and dairy). But each avoids eating meat.
There are also a few semi-vegetarian approaches which include eating small amounts of some meats. People who primarily follow a vegetarian diet but include fish are referred to as pescatarian, while those who occasionally eat other forms of meat are considered flexitarian.
Importantly, not all vegetarians follow a healthy and balanced diet. Many won’t eat the recommended daily servings of fruit and vegetables and will consume too much junk food.
But studies show that balanced vegetarian eating patterns could be good for our immune system and the body’s defenses.
Defending From Attack
Our bodies are faced with daily challenges such as getting rid of toxic chemicals and defending against nasty viruses. The immune system is “switched on” in response to these attacks.
Having a healthy immune system is important, as it prevents us from becoming sick. A healthy immune system can be supported by a number of lifestyle factors including adequate sleep, healthy body weight, and regular physical activity. It can also be substantially affected by the foods we eat and drink.
People following vegetarian diets tend to have lower levels of white blood cells, our natural defender cells. This is the case for vegetarian diets including vegan, lacto-vegetarian and lacto-ovo vegetarian.
Having very low levels of these cells is not ideal as it can affect the body’s ability to fight infection. Having too many can indicate an over-active immune response. However, having just the right number of white cells within a healthy range may reduce your chances of getting sick. Vegetarian diets can help people keep these counts in a healthier range.
An Added Shield of Protection
As well as helping the immune system, vegetarian diets may also help our body with a related process called inflammation. Vegetarian diets have been shown to prevent inflammation due to the antioxidant components within the foods.
Inflammation occurs when the body releases cells to attack unwanted pathogens or respond to injury. It may result in redness to an area of the body or the release of certain chemicals inside our bodies. Inflammation is a protective measure that the body uses to stay as healthy as it can.
People who follow vegetarian diets have lower levels of some of these chemicals (called C-reactive protein and fibrinogen) compared to people following a non-vegetarian diet.
This means people maintaining a vegetarian diet long-term are at a lower risk of getting type 2 diabetes, heart disease or even some cancers. Each of these chronic diseases is associated with increased inflammation in the body. This is shown in blood tests by increased levels of C-reactive protein, as this is a signal of systemic inflammation.
The reason why vegetarians have lower levels of inflammation remains to be fully understood.
We suspect the high amount of fruits, vegetables, whole grains, nuts, and seeds are helping. These foods are full of important nutrients including fibers, vitamins, minerals and compounds called phytochemicals.
All of these nutrients have been shown to improve levels of inflammation in the long term and may influence the body’s immune response as an added bonus.
Should I Switch to a Vegetarian Diet?
Going vegetarian may not be for everyone.
And it’s unwise to start a new eating pattern without understanding the potential impact it can have on your health.
Vegetarian diets that are inappropriately balanced can lead to an increased risk of iron, zinc, and vitamin B12 deficiencies. This can be detrimental to overall health, particularly if followed for extended periods of time.
The risks may be greater for certain groups of people who have added nutrient needs due to life stage, gender, or other health-related reasons.
A vegetarian diet should always be undertaken carefully and under professional guidance, preferably that of a dietitian, to minimize these risks.
Meanwhile, many people in otherwise healthy countries fall short of eating the needed volumes of fruits and vegetables.
For example, in the United States, the Centers for Disease Control and Prevention found that only 13 percent of people reported eating enough fruit and only 8.9 percent reported eating enough vegetables to meet the dietary recommendation.
So whether you’re vegetarian or not, focusing on incorporating more plant-based foods into your diet is worthwhile. We’re constantly learning more ways this is good for your health.
Yasmine Probst is a senior lecturer at the school of medicine at the University of Wollongong in Australia and Joel Craddock is a doctoral candidate at the University of Wollongong. This article was first published on The Conversation.