However, the Portuguese superstar has been accused of hypocrisy after footage and photos emerged of his involvement in old Coca-Cola commercials.
Ahead of the 2006 FIFA World Cup, Ronaldo featured in an advertising campaign endorsing the drink company.
The Juventus forward also filmed a Middle Eastern advertisement for KFC in 2013, during which he enjoys a bucket of fried chicken.
Speaking on ABC News Breakfast, host Lisa Millar said: "You call him an avowed health follower, he has done ads previously for both Coke and Kentucky Fried Chicken."
Former teammate Ryan Giggs revealed Ronaldo once arrived at Manchester United training with Coke bottle in hand, and subsequently copped a spray from the midfielder.
England great Wayne Rooney has also declared Ronaldo gorged on Big Macs to gain weight ahead of Manchester United matches.
Last year, the five-time Ballon d'Or winner revealed his son sometimes "drinks coke and eats crisps", much to his irritation.
Paul Pogba imitated Ronaldo's stunt following France's 1-0 victory over Germany, removing a bottle of Heineken from the table during his post-match press conference.
Portugal will next face Germany on Sunday morning at 4am.