Different national constitutions have different rights that are enumerated. Not all constitutions will have rights, and not all constitutions will have a specific right to food.
Example: Right to food, right to life.
Other terms with the same meaning and function: Human rights, fundamental rights.
See also constitution, legal system, legislature in the primer on public law and regulation.
James R. Fox, Dictionary of International and Comparative Law, 3rd ed., 2003 OUP, ISBN: 978-0-379-21501-4