Known as Eat Right, the service will be accessed from Guardian Unlimited, the website linked to The Guardian and The Observer.
EDiets has editorial and advertising relationships with other sites, including MSN and Handbag.com, but Guardian Unlimited is the first partner to rebadge the service. There are currently around 60,000 eDiets subscribers.
For £2.99 per week for a 10-week programme, users receive a diet plan, recipe suggestions and shopping list, which they can customise according to type of diet and preferred supermarket.
The destination is complemented by Guardian Unlimited's creation of a broader life and health site, , that will bring together Guardian and Observer editorial content.
Topics range from health, consumer and ethical living, family and relationships to fashion, food, homes and gardens and motoring and columnists include food writer Nigel Slater and gardener Monty Don.
Kate Morgan-Locke, head of the Guardian's Enterprise Division, said: "Eat Right takes the hard work out of healthy eating, providing nutritionally balanced diets tailored to our personal preferences."
Tesco acquired the exclusive UK and Ireland licence for eDiets, which operates in the US, in July 2004. The deal was believed to be worth £2m plus royalty fees.
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