The campaign, which was created by Brahm, demonstrates how consumers can ensure their diets include the guideline daily amount of fibre.
It will concentrate on three Warburtons products: Wholemeal, Stoneground Wholemeal and Wholemeal Fibre Boost.
The push, which starts at the beginning of September, spans in-store, online and press activity.
Sampling, for which customers will be offered fibre-rich food such as beans on toast, will take place in-store throughout the autumn. A leaflet containing information, recipes and coupons will be handed out to shoppers.
A dedicated campaign microsite hosts information about fibre, and gives visitors the chance to calculate their daily intake of the substance via a "fibre counter".
The promotion will be supported by a campaign in women's press and flashes on the relevant packaging.
Brahm head of promotional marketing Paul McCann said: "Research has shown a big gap between the average daily fibre intake and what is recommended, which may affect the nation's health. The British Nutritional Foundation advises adults to eat 24g of fibre a day, but most manage just half that amount."
Last year, Warburtons was the leading UK bread baker. According to TNS Worldpanel's Biggest Brands survey, it is the eighth largest grocery brand in the UK, ahead of McVitie's and Hovis.
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