In this answer, I mention that the Bodhisatta had trouble keeping down coarse alms food, to the extent that he felt like his stomach was going to leap out of his throat. @ThiagoSilva asked in a comment where the story is found, and I can't quite remember. Does anyone have a reference handy?
EDIT: Here's an example of how the passage is described, though no mention of where it comes from:
Having enjoyed the kingly bliss which was as great as that of a Universal Monarch only a matter of days ago, he made an effort to eat a morsel of food which was a mixture of coarse and fine edible things in assorted colours. As he was about to put the morsel into his mouth he felt miserable and almost vomited with the intestines turning upside down, for he had never seen such kind of food in his life and found it particularly disgusting. Then he admonished himself by saying; "You Siddhattha, in spite of the fact that you have been reigning supreme in a palace where food and drinks are available at your pleasure and where you have meals of three-year-old seasoned fragrant rice with different delicacies whenever you like, you, on seeing a recluse in robe of rags contemplated, "When shall I eat the meals obtained by going on alms round from house to house after becoming a recluse like him? When will the time come for me to live on meals thus collected? And have you not renounced the world and become a recluse with such thoughts? Now that your dream has come true, why do you like to change your mind?" Then without the slightest revulsion he took the meal that was so rough.