How much fat does a human need?

It is possible to become very, very fat before you die. The heaviest confirmed case is around 1,400 pounds, though there is anecdotal evidence of people weighing over 2,000 pounds. In more practical terms, however, many people over 300 pounds have serious health issues, and most people over 500 pounds can expect to have drastically shorter lives as a result. It's best not to try!