WhenGoldhits movie theaters this January, viewers will be treated to a whole lot of McConaughey.

Thats cheeseburgers and beers for eight months, whenever I wanted them, he told DeGeneres happily.

I never got tired.

ALL CROPS: Matthew McConaughey, star of the animated film, “Sing,” makes an appearance on “The Ellen DeGeneres Show” on Wednesday, December 14th

Credit: Michael Rozman/Warner Bros.

I had great energy.

My nickname in the household was Captain Fun.

(Though he did add that the kids didnt eat quite as much as him.)

But there was a flip side to all the fun.

Losing the excess pounds wasnt nearly as enjoyable and took a grueling six months to do.

That revelation didnt faze DeGeneres though.

Goldopens in theaters on Jan. 27.

Watch the full interview below.