Table 2.

Definition of common vegetarian and vegan diet types

Type	Definition
Omnivore*	Includes meat, poultry, fish, eggs and dairy products
Flexitarian†	Occasionally excludes meat and poultry but remains consumption of fish, eggs and dairy products
Pescatarian†	Excludes meat and poultry but remains consumption of fish, eggs and dairy products
Lacto-ovo vegetarian†	Excludes meat, poultry and fish but remains consumption of dairy products and eggs
Lacto vegetarian†	Excludes meat, poultry, fish and eggs but remains consumption of dairy products
Ovo vegetarian†	Excludes meat, poultry, fish and dairy products but remains consumption of eggs
Vegan†	Excludes all animal products (meat, poultry, fish, eggs and dairy products)
Strict raw‡	Excludes all animal products (meat, poultry, fish, eggs and dairy products) and heated food items.

^*Diet definition includes descriptions of omnivore (basic) and omnivore (regular) from Kowalska et al. 2020⁽⁵⁷⁾. Omnivore (basic) includes all food groups including meat, poultry, fish, dairy products and eggs; omnivore (regular) describes data collected from 24-h dietary recalls from ten Polish adults that were used to make standard ‘menus’ for omnivorous participants.

^†Diet definitions from Phillips 2005⁽⁵⁾.

^‡Diet definition from Abraham et al. 2022⁽⁵³⁾.