Soya studies

It’s difficult to isolate soya’s benefits conclusively:

  • No one has given people soya foods, then looked at whether they’re more or less likely to get breast cancer over time than those not given soya.
  • One review of evidence into soya's effect on breast cancer risk found studies were adjusted for body mass index (BMI). It means the lower risk of breast cancer could be due to lower BMI, not soya intake.

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