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Going up several skirt sizes in midlife could be a warning sign of increased cancer risk, research suggests, according to the BBC.

Women who went up a skirt size every decade after their mid-20s had a 33% greater risk of breast cancer after the menopause, say researchers at University College London.

Watching your skirt size from your mid-20s onwards could be a simple way to track weight gain, they told BMJ Open.

Obesity is a known risk factor for cancer, particularly midriff fat.

The study tracked more than 90,000 women in their 50s and 60s living in England.

During the three-year follow-up period, 1,090 women developed breast cancer.

The researchers found that a unit increase in UK skirt size every 10 years (for example from 12 to 14) between 25 and post-menopausal age was linked to a 33% increased risk of breast cancer.

Going up two skirt sizes in the same period was associated with a 77% greater risk, they report.

Commenting on the research, Simon Vincent of Breakthrough Breast Cancer said: "We know that 40% of breast cancers could be prevented by changes to lifestyle such as being regularly active and maintaining a healthy weight.

"This study highlights an easy way to monitor your weight gain over time. Women are more likely to remember their skirt size when they were younger than their BMI."