Scientists found that a daily brisk walk of 25 minutes almost halved the mortality among breast cancer patients while a waistline larger than 35 inches rose death rates by a third.
Results of trials showed "powerful" and "groundbreaking" evidence of the benefits of a slim waistline, with weightloss and exercise helping even those with advanced cancer, 'the Telegraph' reported.
According to experts, losing five per cent of body weight may lead to a 20 per cent increase in breast cancer survival.
"Every woman diagnosed with breast cancer should be counselled about weight loss and weight management, and about the role of exercise," said Irwin.
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"Diagnosis offers a window of opportunity, and diet and exercise can have a profound and powerful effect," she added.
Researchers tracked almost 5,000 breast cancer sufferers and found that three hours brisk walking a week was associated with a 46 per cent fall in death rates.