Diet and Exercise I’m worried about eating too much soy, and it seems like soy lecithin is in virtually everything, including supplements and sugarless gum. What can I do? Soy lecithin is a by-product of soybean oil. It is an emulsifier used to hold ingredients together. It is extracted from soybeans, but it is not part of the soy protein. As a result, it does not contain any isoflavones, which are the part of the soybean that acts as an estrogen. This means that you don't need to worry that you are getting lots of isoflavones in your diet each time you chew gum or take a supplement.
You can learn more about eating soy after a breast cancer diagnosis here.
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