The vegetarian diet has gained widespread popularity in recent years.
Some studies estimate that vegetarians account for up to 18% of the global population (1).
Apart from the ethical and environmental benefits of cutting meat from your diet, a well-planned vegetarian diet may also reduce your risk of chronic disease, support weight loss and improve the quality of your diet.
This article provides a beginner’s guide to the vegetarian diet, including a sample meal plan for one week.
The vegetarian diet involves abstaining from eating meat, fish and poultry.
People often adopt a vegetarian diet for religious or personal reasons, as well as ethical issues, such as animal rights.
Others decide to become vegetarian for environmental reasons, as livestock production increases greenhouse gas emissions, contributes to climate change and requires large amounts of water, energy and natural resources (2, 3).
There are several forms of vegetarianism, each of which differs in their restrictions.
The most common types include:
- Lacto-ovo-vegetarian diet: Eliminates meat, fish and poultry but allows eggs and dairy products.
- Lacto-vegetarian diet: Eliminates meat, fish, poultry and eggs but allows dairy products.
- Ovo-vegetarian diet: Eliminates meat, fish, poultry and dairy products but allows eggs.
- Pescetarian diet: Eliminates meat and poultry but allows fish and sometimes eggs and dairy products.
- Vegan diet: Eliminates meat, fish, poultry, eggs and dairy products, as well as other animal-derived products, such as honey.
- Flexitarian diet: A mostly vegetarian diet that incorporates occasional meat, fish or poultry.
Summary Most people who follow a vegetarian diet don’t eat meat, fish or poultry. Other variations involve the inclusion or exclusion of eggs, dairy and other animal products.
Vegetarian diets are associated with a number of health benefits.
A vegetarian diet may provide several other health boosts as well.
May Enhance Weight Loss
Switching to a vegetarian diet can be an effective strategy if you’re looking to lose weight.
In fact, one review of 12 studies noted that vegetarians, on average, experienced 4.5 more pounds (2 kg) of weight loss over 18 weeks than non-vegetarians (6).
Similarly, a six-month study in 74 people with type 2 diabetes demonstrated that vegetarian diets were nearly twice as effective at reducing body weight than low-calorie diets (7).
Plus, a study in nearly 61,000 adults showed that vegetarians tend to have a lower body mass index (BMI) than omnivores — BMI being a measurement of body fat based on height and weight (8).
May Reduce Cancer Risk
Therefore, more research is needed to understand how vegetarianism may impact cancer risk.
May Stabilize Blood Sugar
Several studies indicate that vegetarian diets may help maintain healthy blood sugar levels.
For instance, one review of six studies linked vegetarianism to improved blood sugar control in people with type 2 diabetes (14).
Vegetarian diets may also prevent diabetes by stabilizing blood sugar levels in the long term.
According to one study in 2,918 people, switching from a non-vegetarian to a vegetarian diet was associated with a 53% reduced risk of diabetes over an average of five years (