March 1, 2018
Prevalence of Inadvertent Cross Contamination - New Study with Important Implications for Those with Celiac:
A study published in Feb. 2018 in The American Journal of Clinical Nutrition indicated that a high percentage of celiac disease patients who continue to show symptoms after believing they were following a strict, gluten-free diet are actually ingesting 3 to 8 times the amount of gluten the study's authors considered "safe" for adults with celiac to consume.
Alarmingly, individuals from the meta-analysis adhering to a gluten-free diet were still unknowingly ingesting 3 to 7 times the 50 mg of gluten per day that the study's authors considered safe for adults with celiac to consume Note, children 4-12 were inadvertently eating the highest levels of gluten on average while on a gluten-free diet in the study.
Depending on the (small sample size) studies available, 10 mg - 50 mg of gluten per day seems to be generally considered tolerable for adults with celiac to consume (see the National Institute of Health's Health Hazard Assessment for those with Celiac Disease), although beyond that, researchers still do not understand the full spectrum of toxicity caused by smaller amounts of gluten ingested in individuals. The recent (large sample size) meta analysis referenced above seems to indicate it may not be too hard to get to that upper safe threshold of gluten just from cross contamination or similar unintended gluten consumption. (1)https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4766553/
Determination of gluten consumption in celiac disease patients on a gluten-free diet
Jack A Syage, Ciarán P Kelly, Matthew A Dickason, Angel Cebolla Ramirez, Francisco Leon, Remedios Dominguez, Jennifer A Sealey-Voyksner; Determination of gluten consumption in celiac disease patients on a gluten-free diet, The American Journal of Clinical Nutrition, Volume 107, Issue 2, 1 February 2018, Pages 201–207, https://doi.org/10.1093/ajcn/nqx049
Video Letter from Tricia Thompson, MS, RDN of GlutenFreeWatchdog.org to FDA regarding her concern with enforcement of the FDA gluten-free label rule and several products that are currently misbranded as gluten-free right now.