A food is something that provides nutrients.
Nutrients are substances that provide: energy for activity, growth, and all functions of the body such as breathing, digesting food, and keeping warm; materials for the growth and repair of the body, and for keeping the immune system healthy.
Waitperson: Hi. How are you doing this afternoon?
Customer (you): Fine, thank you. Can I see a menu, please?
Waitperson: Certainly, here you are.
Customer: Thank you. What's today's special?
Waitperson: Grilled tuna and cheese on rye.
Customer: That sounds good. I'll have that.
Waitperson: Would you like something to drink?
Customer: Yes, I'd like a coke.
Waitperson: Thank you. (returning with the food) Here you are. Enjoy your meal!
Customer: Thank you.
Waitperson: Can I get you anything else?
Customer: No thanks. I'd like the check, please.
Waitperson: That'll be $14.95.
Customer: Here you are. Keep the change!
Waitperson: Thank you! Have a good day!
Customer: Goodbye.