The enumeration in the Constitution, of certain rights, shall not be construed to deny or disparage others retained by the people.
The Ninth Amendment explains that, while there are certain specific rights granted to the people in the Constitution, the rights listed therein are not to be interpreted as the only rights retained by the public. For example, the Constitution does not enumerate the right to eat, but it does not deny it either. The Ninth Amendment recognizes that such natural rights are retained by the people.
United States Bill of Rights
United States Constitution