MWO had held the account for the crispbread and snacking brand for five years.
Ryvita's media spend for 2008 was £2.8m, according to Nielsen Media Research.
A spokesman for Ryvita said: 'The time is right to explore new directions for bringing the brand's values to life.' How-ever, he claimed that Britton would continue to appear in the brand's ad campaigns.
Ryvita has begun the search for a replacement agency, with Jordans marketing director Carol Welch overseeing the process. She has taken responsibility for the Ryvita brand following a restructure earlier this year by Associated British Foods (ABF), the parent company of both brands.
As a result of the changes, the entire Ryvita business, including its marketing department, was folded into the Jordans operation. It is understood that Nigel Nelms, the former Ryvita marketing director, has been handed a new position at ABF. Advertising for the Jordans brand is currently handled by VCCP.
Ryvita extended its contract with Britton last month despite the revelation last year that the TV presenter had used a gastric band to lose weight.
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