Once you create a basic account you can customize the food preferences however you like. The preset diet options simply pre-select some food exclusions for you,

Once you create a basic account you can customize the food preferences however you like. The preset diet options simply pre-select some food exclusions for you, but you can select "anything" and create your own set of exclusions from scratch. As a forewarning, keto + vegetarian or vegan is one of the tougher things for our algorithms to do well. Maybe we're missing some critical recipes that keto vegetarians use, but it eliminates something like 90% of our available recipes.