Extreme weight gain increases breast cancer survivors’ risk of cancer recurrence and death, but moderate weight gain has no effect on outcomes, a new study finds.
Researchers analyzed data from 18,336 breast cancer survivors in the United States and China, ages 20 to 83, whose weight was assessed 18 to 48 months after diagnosis and compared with their pre-diagnosis weight.
Extreme weight gain (10% or greater than pre-diagnosis weight) occurred in 16% of the women. They were 14% more likely to suffer a cancer recurrence than women whose weight remained stable (within 5% of their pre-diagnosis weight).
Among the women with extreme weight gain, 19.4% had a body mass index (BMI) lower than 25, which is considered normal weight, before their diagnosis of breast cancer.
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