In a move to win over the health-conscious, Heinz has launched a stevia-based variant of its flagship ketchup in the UK - which has half the sugar content of the conventional sauce. But is this yet another gimmick to cool pressures from health organisations wanting food firms to take responsibility for the impact of their products on the public's health? Or will it really gain traction with the UK public, and if so, will this be the start of a whole new range for Heinz? Hannah Abdulla explores