MyDish.co.uk was set up by entrepreneur Carol Savage, after she secured financial backing for the website from Deborah Meaden when she appeared on BBC2's Dragons' Den earlier this year.
The web site is described as ‘the Facebook for food lovers'.
Launching their food strategy, games organisers said that 3m of the 14m meals served during the two-week event will be prepared by the fast food chain. All branded soft drinks will be provided by Coca-Cola and the only other branded food on sale will be Cadbury's chocolate. McDonald's and Coca-Cola both sponsor the International Olympic Committee, which passes several million pounds of those revenues to London's organisers, while Cadbury pays £20m as a direct sponsor of the 2012 games.