49 CFR Part 37 - Transportation for Individuals With Disabilities; Reasonable Modification of Policies and Practices

6. Eating and Drinking.

If a passenger with diabetes or another medical condition requests to eat or drink aboard a vehicle or in a transit facility in order to avoid adverse health consequences, the request should be granted, even if the transportation provider has a policy that prohibits eating or drinking. For example, a person with diabetes may need to consume a small amount of orange juice in a closed container or a candy bar in order to maintain blood sugar levels.