This might be another reason people just do better to avoid bread products and all foods that are fortified--

Since 1998, folic acid has been added to most enriched bread flours, cornmeal, pasta, rice, and other grain products in the U.S. and Canada.

[link to www.hsph.harvard.edu]

Unmetabolized folic acid can cause health problems for all people that don’t show up for many years.

It can decrease natural killer cell cytotoxicity and impair the body from responding to arthritis, cancer and anti-malarial drugs.

In the elderly, who often have B12 deficiencies, folic acid can cause cognitive impairment and anemia.

And while folic acid can have a protective effect against certain cancers, it can accelerate the growth of tumors already present.

[link to mthfrliving.com]