Depression is one of the symptoms of celiac disease. That's possibly because the disease causes impaired absorption of the amino acid tryptophan, which the body converts into serotonin. But psychological distress among celiac-disease patients only stands to reason, given that some of the other symptoms and effects of this incurable condition include diarrhea, abdominal pain, bloating, gas, constipation, irritable bowel syndrome, failure to thrive in infancy, vomiting, short stature, iron deficiency with or without anemia, poor performance in school, delayed puberty, infertility, recurrent miscarriage, osteoporosis, vitamin deficiencies, fatigue, tooth discoloration and dental enamel defects, skin disorders, elevated liver enzymes, Down syndrome, Sjogren's syndrome, canker sores, arthritis, depression, nerve and balance problems, irritability, seizures, and migraines. Oh, and it's been linked with ADHD, too. Read More