International Coeliac Day
International Coeliac Day is held on May 16. This event in the second decade of the month May is annual. 
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Celiac disease is a genetic autoimmune disease that damages the villi of the small intestine and interferes with the absorption of nutrients from food. 1 in 100 people worldwide have celiac disease.
The most common misdiagnoses include irritable bowel syndrome, inflammatory bowel disease, gastroesophageal reflux disease, and ulcers. Approximately 37% of women with celiac disease also show symptoms of depression.
Similar holidays and events, festivals and interesting facts
International Conscientious Objectors Day on May 15
World Whisky Day on May 15 (Third Saturday of May);
World Dog Day on May 15 (started by The Vanderpump Dog Foundation in 2016. Celebrated on the third Saturday of May);
World Nordic Walking Day on May 15 (is a day of unified commemoration of the Nordic Walking Family around the world. It is for everyone, of all ages and abilities);
European Obesity Day on May 15 (Held on the third Saturday in May);
Mucopolysaccharidosis Awareness Day on May 15
International Tuberous Sclerosis Awareness Day on May 15
Nurse Day in El Salvador on May 15 (Día de la Enfermería);
Sanitation Workers' Day in Argentina on May 15
International Day of Light on May 16 (initiated by UNESCO on November 14, 2017);
International Day of Living Together in Peace on May 16 (adopted by the UN on December 8, 2017);
World Heavy Metal Day on May 16
International Boys Day on May 16
International Day Against Homophobia, Transphobia and Biphobia on May 17
World Information Society Day on May 17 (International);
World Internet Day on May 17
National Hoarding Awareness Week in UK on May 17 (held from the third Monday of May)