My doctor told me not to eat cotton candy before riding the roller coaster because he did that once and he got sick?

It sounds like your doctor had a bad experience with cotton candy and Roller Coasters, likely due to the sugary treat causing an upset stomach during the ride. Eating sugary or heavy foods before a thrilling ride can lead to nausea or discomfort. It's wise to heed his advice and choose lighter snacks to enjoy before the thrill of the coaster!