Children across the country share experiences with celiac disease

Jax Bari shared an emotional letter with "World News Tonight."

Jax Bari shared an emotional letter with "World News Tonight" about his experience with the autoimmune disorder celiac disease. "Dear Mr. Muir, when I turned 8 in March, I wished for a cure for Celiac Disease for me and 3 million Americans with Celiac," wrote Jax. The 8-year-old said he watches the news every night and wanted to spread awareness of the disease that's triggered by gluten and damages the small intestine. "I watch you every night with my dad," he wrote to ABC News' David Muir. "You are a great storyteller and I have learned a lot from you, including about the NIH."