The Soy Conundrum: Part 2

As I said in my last post, this is a HUGE topic that would take volumes to adequately explore. Is soy a human food? My answer is a tentative maybe. Here are more reasons why...

Farming practices: Aside from the fact that nearly all soy grown in the US is now genetically modified, it is important to know that this modification allows soy to withstand heavy doses of herbicides. Unfortunately, because soy is a legume, it is very good at soaking up these toxins and incorporating them into the beans themselves. You can’t wash them off. (GMO issues will be discussed in another posting.) These toxic residues have many potential harmful effects on the human system including acting as endocrine disruptors, meaning they will mess around with your whole hormone system.

Phytoestrogenic properties: “Phyto” means plant, so phytoestrogens are estrogen-like substances found in plants. They are present in many different plants including alfalfa sprouts, flaxseeds, clover, hops and thyme, but they are highest in legumes and soy contains the highest amount of them all. Studies have been inconclusive about if these phytoestrogens help menopausal symptoms or if they worsen hormone sensitive cancers. However, these compounds have been shown to have feminizing effects on infant boys and can accelerate sexual maturation in girls. In some cases soy has been implicated in the development of gynecomastia in adult men (the development of breast tissue) and a decrease in sperm production.

Autoimmune disease: More than 70 years worth of studies have connected soy consumption to thyroid disorders, especially Hashimoto’s thyroiditis. This is a type of autoimmune disease that causes hypothyroidism. (Interestingly enough, the exacerbation of Hashimoto’s has also been connected to gluten consumption.) If you suffer from hypothyroid and especially Hashimoto’s, you may find significant symptom relief by eliminating soy. This can seem like a daunting task because soy is everywhere.

Processed foods: Soy is in nearly 60% of all processed foods and basically 100% of fast foods. Soy and soy derivatives are the backbone of the food product industry. The durable nature of soy proteins and their low cost makes them ideal for highly processed foods. If you are trying to avoid soy, the best thing to do is to shop the perimeter of your market where all the REAL food is and cook it yourself. Instead of spending hours trying to read labels to find all the places soy is hidden, spend that time making your own foods.

Cardiovascular health: Soy has been promoted as beneficial for cardiac health. Most of these studies focus on specific constituents of soy called isoflavones. It is important to consider the whole package if soy is used as a food source. It is also important to look at the way some of these studies were put together. Benefits have been shown when conventionally raised animal products are replaced by soy as a protein source, but is the outcome due to soy or due to the reduction in damaged fats and proteins that come from conventional meats and dairy? Be sure to look carefully at studies, both pro and con.

Conclusion: Caution. Soy can be beneficial for humans in small amounts if fermented. Certain constituents may be beneficial for treatment of certain disease states. But the use of soy in its highly processed forms (TVP, soy protein isolate, etc) as the primary source of protein in the diet can be problematic, especially for children.



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(also published on the Patch.com)