HOLLYWOOD: Keith Urban is reportedly always hungry because he doesn't enjoy the super-healthy food cooked by his wife Nicole Kidman.

Nicole Kidman needs to give husband Keith Urban more sugar.

The country singer is reportedly always left hungry because he doesn't have an appetite for his wife Nicole's super-healthy meals and often visits his favourite fast food outlets rather than face her bland food.

A source said: "Nicole cooks with no sugar, salt, butter or oil."

The 42-year-old singer - who married the actress in 2006 - is also being pushed into exercise by his wife, who previously spoke about important exercise was to her.

The Australian actress - who has a 17-month-old daughter Sunday Rose with the star - said her father taught her the benefits of jogging at an early age and it's a skill she is hoping to pass on to Keith.

She said: "It's what my dad taught us - he's a marathon runner. He's 71 and goes on 10-mile runs. He takes Sunday hiking on his back for hours."

The Oscar-winning actress insisted she doesn't count calories however, thanks to her spouse.

She said: "As Keith's a musician there are pit-stops at Wendy's. But I'm six foot tall so it's not weight that's an issue for me, but things like cholesterol."