Moderate weight loss can cut risk of breast cancer

US researchers looked at 439 overweight-to-obese women, aged 50–75, who were randomly assigned to one of four groups: exercise only, diet only, exercise plus diet and no intervention.

They found that oestrone levels decreased 9.6% with diet and 11.1% with diet plus exercise, while oestradiol levels decreased by 16.2% with diet and 20.3% with diet plus exercise.

“Based on previous research, our results suggest that losing just 5% or more of one’s weight could cut by a quarter to a half the risk for the most common, oestrogen-sensitive breast cancers,” they said.

They cautioned that