Fuelled by a takeaway meal and a take-it-easy attitude, Queenslander Leisel Jones broke her second world record in two nights at the World Cup shortcourse meet in Melbourne on Saturday night.

Jones shattered the women's 200m breaststroke mark, taking more than a second off the old mark held by China's Hui Qi in clocking 2min 17.75sec.

The 18-year-old from Brisbane had broken the 100m breaststroke record on Friday night.

Jones beat nearest rival Brooke Hanson by nearly five seconds on her way to the record - jokingly suggesting a rare fast food lunch may have helped her fast time.

"I spoiled myself today and had a bit of takeaway," Jones said.

"I felt shocking this morning (in the heats). I was lactating in the first 100 and felt pretty terrible and I thought 'I'm going to swim really terrible tonight'.

"I went out there pretty relaxed. I suppose that's a good thing because I didn't have any expectations.

"I wasn't expecting to swim fast so I took that into consideration and took it pretty easy."

Jones will compete in the women's 50m breaststroke on Sunday with a similar attitude.

"I'm feeling so good now, we'll see what happens.

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