Table 1.

Types of plant-based diets and definitions.

Types of plant-based diet	Definition
Vegan	Exclude all animal foods and dairy products. Does not require the consumption of whole foods or restrict fat or refined sugar (20,63)
Lacto-ovo-vegetarian	Excludes meat but includes dairy products, eggs, and honey (20,63)
Lacto-vegetarian	Exclude eggs, meat, seafood, and poultry, and include milk products (20,63)
Ovo-vegetarian	Exclude meat, seafood, poultry, and dairy products but include milk (20,63)
Semi-vegetarian	Varies widely. Involve consuming red meat, poultry, or fish no more than once per week, no red meat at all, or limiting red meat to once per week and poultry to five times per week (21).
Mediterranean diet	Like a whole plant-based diet, this approach permits small amounts of chicken, dairy products, eggs, and red meat once or twice a month. It also encourages the consumption of fish and olive oil, with no restrictions on fat intake (20)