Body clock linked to breast cancer: BBC News Review

British scientists have discovered that women who naturally get up early are less likely to develop breast cancer. After an eight-year study, research has concluded that among early risers, only one in every 100 women develop breast cancer. This rose to two in every hundred for women genetically programmed to go to bed late and get up late. The scientists say the research provides further proof that a person's body clock and sleeping patterns affect their health.

Vocabulary
larks
people who get up early and have lots of morning energy
I've never been one of the larks. I'd much rather sleep all day and party all night.
She's always been a morning lark. As an artist, she's most creative in the morning.

chirpiest
happiest and most active
James might be the chirpiest person I've ever met. Have you ever seen him sad?
The surprise birthday party left him feeling much chirpier about turning 40.

mismatch
situation when two things are not suitable for each other
There's a bit of a mismatch between our budget and your business plan. Sorry!
Despite seeming to be a total mismatch, they love each other very much.

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