Mary Shomon: Since the late 1950’s, it has been known that soy formulas contain anti-thyroid agents. Infants on soy formula are particularly vulnerable to developing autoimmune thyroid disease when exposed to high exposure of isoflavones over time. [3] This study found that the frequency of feedings with soy-based milk formulas in early life was noticeably higher in children with autoimmune thyroid disease, and thyroid problems were almost triple in those soy formula-fed children compared to their siblings and healthy unrelated children. Dr. Fitzpatrick even believes that long-term feeding with soy formulas inhibits TPO to such an extent that long-term elevated TSH levels can also raise the risk of thyroid cancer.

Not much is being done in the U.S. to make parents aware of the thyroid-related dangers of soy formulas, or to alert the public that heavy soy consumption may be a danger to thyroid function. Other countries, however, are far ahead of the U.S. In July of 1996, the British Department of Health issued a warning that the phytoestrogens found in soy-based infant formulas could adversely affect infant health. The warning was clear, indicating that soy formula should only be given to babies on the advice of a health professional. They advised that babies who cannot be breastfed or who have allergies to other formulas be given alternatives to soy-based formulas.

Polly: Those warnings apply to toddlers too. Soy based milk substitutes meant for adults aren’t a good idea for children. Besides the isoflavones problem, they don’t supply enough vitamin D to prevent rickets. Rice milk is a problem for toddlers too. It doesn’t have enough protein in it to keep a child healthy. [4]

Mary Shomon: Since the late 1950’s, it has been known that soy formulas contain anti-thyroid agents. Infants on soy formula are particularly vulnerable to developing autoimmune thyroid disease when exposed to high exposure of isoflavones over time. [3] This study found that the frequency of feedings with soy-based milk formulas in early life was noticeably higher in children with autoimmune thyroid disease, and thyroid problems were almost triple in those soy formula-fed children compared to their siblings and healthy unrelated children. Dr. Fitzpatrick even believes that long-term feeding with soy formulas inhibits TPO to such an extent that long-term elevated TSH levels can also raise the risk of thyroid cancer.

Not much is being done in the U.S. to make parents aware of the thyroid-related dangers of soy formulas, or to alert the public that heavy soy consumption may be a danger to thyroid function. Other countries, however, are far ahead of the U.S. In July of 1996, the British Department of Health issued a warning that the phytoestrogens found in soy-based infant formulas could adversely affect infant health. The warning was clear, indicating that soy formula should only be given to babies on the advice of a health professional. They advised that babies who cannot be breastfed or who have allergies to other formulas be given alternatives to soy-based formulas.

Polly: Those warnings apply to toddlers too. Soy based milk substitutes meant for adults aren’t a good idea for children. Besides the isoflavones problem, they don’t supply enough vitamin D to prevent rickets. Rice milk is a problem for toddlers too. It doesn’t have enough protein in it to keep a child healthy. [4]