Paul Lustig will leave his position as head of the US snacks business of global cereals giant Kellogg after just seven months.

President of Kellogg USA David Mackay said that Lustig was leaving by mutual agreement as corporate strategy had changed the nature of his job. Mackay will take on additional responsibility for the snacks business.

Sales in Kellogg’s snack division fell away 4% in the fourth quarter after some contract business was eliminated and rivals intensified their efforts, notably Kraft Foods, the US’ largest food manufacturer.

The company is aiming to make progress through internal growth rather than by acquisition.