A ten-year study of 630,000 women shows piling on a few pounds up to around the mid-50s cut their risk of developing the disease before this age.
But after the menopause, weight gain increases the risk of breast cancer and scientists urged women to maintain a healthy weight. Around 11,000 women in the study went on to develop the disease and the more weight they put on, the stronger the protective effect.
Those who put on 10 kilos (22lbs) from their 20s to middle age cut their risk by 8%. Weight gain, particularly from 18 to 24 and just before the menopause, from 45 to 54, had the strongest protective effect.
In these age g...