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This wise-cracking 104-year-old says one of the secrets to her long life is drinking three cans of Dr Pepper a day.

Although doctors warn Elizabeth Sullivan that it's bad for her health, she's living proof of the fizzy drink's famous slogan - 'what's the worst that could happen?'

She started drinking it in her when she was in her sixties and has loved the sugary stuff ever since.

She told CBSDFW: "Every doctor that sees me says it will kill you.

"But they die and I don't so there must be a mistake somewhere."

(Image: Huffington Post)

She added: "People try to give me coffee for breakfast, well I'd rather have a Dr Pepper."

For Sullivan's 104th birthday she received a cake shaped like a Dr Pepper can and a massive supply of the drink.

Her loyalty was even rewarded with a special gift basket from the company's CEO.

The remarkably sprightly 104-year-old is still able to walk with the help of a stick and is in good spirits.

She said: "I'm glad I can still read books and watch TV and still have people come by and say hello."