Optional

1. Buying a book is optional, 
2. going for a vacation is optional, 
3. thinking about God is optional, 

but food is not optional. 

https://www.google.com/search?q=food+option

hack

 https://www.google.com/search?q=eat+hack

ABVP

 https://www.google.com/search?q=ABVP

pact

 https://www.google.com/search?q=food+pact