I've learned this from experience. Do not ride any coaster that is 2.5Gs or above on a empty stomach. YOU WILL FEEL REALLY ILL. I did that at Carowinds, No lines so I rode Top Gun 32 times that day, and I ate nothing, That night I felt so ill and my pulse was so rapid, It was terrible. So the moral is, eat in moderation and eat like you would at home.