The diet brand, which has not advertised its food range before, sells a range of branded products such as yoghurts and cereals, produced by manufacturers including Warburtons and Yoplait Dairy Crest under licence.
All of its products are labelled with the programme's point system.
JWT's hold on the Weight Watchers meetings business will not be affected by CHI's hiring. The agency's Label division was appointed to handle the £7m business in April after pitching against CHI and Delaney Lund Knox Warren, but has not yet created any advertising.
Elizabeth Egan, Weight Watchers' head of product licensing and at home, said CHI would work exclusively on the grocery range. 'We're going to commit to a bigger spend in the future on our licensed food and are looking at a new creative specifically for it,' she said.
The brand will spend £1m over the next year on ads for the products, which Egan said could include TV, although details were still being finalised.
The licensees and Weight Watchers will jointly fund the advertising.
Weight Watchers products are worth £135m - up almost 20% in the past year - with Weight Watchers from Heinz, including soup and ready meals, worth £116m.
Separately, CHI has been retained by English Heritage to handle its £1m advertising and direct marketing accounts.
The conservation body, which maintains historical sites across England and is backed by the Department for Culture, Media and Sport, is developing a five-year plan to change perceptions of England's historic environment.
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