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New McDonald’s gourmet burgers have up to a third more calories than a Big Mac and nearly double the fat.

The Signature Collection includes its Classic burger , which has 698 calories, the Spicy with 635 and the Barbecue with 782 – up to 35 per cent more than favourites like the Big Mac’s 508.

And the BBQ burger contains 44 grams of fat – compared to 25 grams in a Big Mac.

McDonald’s unveiled the new range last ­summer and relaunched them for its sponsorship of the Six Nations rugby championship on ITV.

(Image: Reuters)

Health experts slammed the firm for linking fast food with sport.

Tam Fry, of the National Obesity Forum, said: “McDonald’s is irresponsible.

"A main meal for an adult should contain no more than 600 calories.”

McDonald’s said: “We’re always transparent about our ingredients and have been providing nutritional information for over 30 years.”