Many people suffer from Celiac’s disease. To be eligible to deduct the excess costs of a gluten-free diet under Internal Revenue Code Section 213, you must have a documented reason to require the observance of a gluten-free diet, along with a physician’s prescription to follow a gluten-free diet. This should provide sufficient documentation of eligibility.
The excess cost of gluten-free food can be deducted if you can deduct expenses paid for medical care for yourself, a spouse, or a dependent, to the extent the aggregate expenses exceed 10 percent of adjusted gross income.
If you meet both criteria above and choose to itemize deductions start collecting receipts and record them regularly. Download a spreadsheet from the Celiac Sprue Association for calculating the deductible expense.