Are soy foods safe? | Mark Messina, PhD

Historical Controversy

The historical controversy surrounding soy is deeply rooted in its introduction to non-Asian countries during the counterculture movement of the 1960s and 1970s. Mark Messina explains that soy became a dietary staple among vegetarians, leading to increased scrutiny and debate over its health effects 1. The controversy largely stems from the presence of isoflavones, bioactive compounds in soy that mimic estrogen, causing concern among certain groups about their potential impact on human health 2. Messina highlights that initial fears were based on animal studies, which often do not translate directly to human outcomes.

You can't dismiss the animal studies. What you need to do is then they're good for hypothesis generation, just like observational studies are.

--- Mark Messina

Today, extensive clinical and observational studies have shown that soy does not adversely affect breast cancer risk, challenging earlier misconceptions 2.

   

Industry Skepticism

Skepticism towards soy research often arises from its industry affiliations, leading some to question the validity of findings. Simon Hill and Messina discuss how industry-funded research is often dismissed due to perceived bias, despite rigorous scientific standards 3. Messina argues that the presence of co-authors without industry ties in many studies helps ensure objectivity. He emphasizes the importance of evaluating the science itself rather than focusing solely on affiliations.

All we can do is do good science and publish in the best journals.

--- Mark Messina

Despite these challenges, the safety of soy, particularly in infant formulas, continues to be supported by numerous studies, including those by the American Academy of Pediatrics 4.