Sadly, the benefits these families gained from being filmed for Fed Up - if there were any - seem lost as the film feels more exploitive more than revolutionary.

Fixating on the fat rolls of underprivileged kids without mentioning class, the film is a more polished version of the greasy tale Morgan Spurlock's Super Size Me told from the inside out.

It's a decent summary of the issue, taking square aim at corporations and politicians who have made it easy for the citizenry to stuff its collective face with junk food and, even more damaging, sugar.

Valuable for both its message and its fervently researched filmmaking, Fed Up needs to be seen.