Gregg, who is allergic to
soy, believes chemical compounds in
soy can contribute to a number of
health problems, like hypothyroidism.
"You're seeing more problems as far as hypothyroidism," said Gregg, "women are gaining weight because they have a problem with their thyroid." The chemical compounds can also affect men.
"It can lower their libido, lower their testosterone levels," said Gregg.
But not everyone agrees with Gregg's findings.