To make a decision about what to eat next, that reflects what might happen later. The avoidance of an unfortunate outcome, out of one or both ends of the digestive system, resulting from choosing not to eat a certain item, dish, or at a particular food establishment.
Larry decided to use good gastrosense and order french toast at the family dining establishment. His friends all ordered the chili topped with jalapenos, and harassed Larry about his panzy-like french food choice. However, later that day, Larry felt good, while his friends all were hugging toilets and praying to the porcelain gods.
Michael Winner: Waiter! This steak is diabolical. It is clearly medium rare when I specified medium! The pasta course was unimaginative and barely tepid, and as for the soup, it was redolent of a Montmartre fille du joie's vaginal secretions after a hard night's work.
Waiter: What do you expect in a Travelodge? Bloody gastrognome. *spits on desert*
When I took my three year old with stomach pains to the pediatrician, she referred me to a gastroentomologist after learning that he puts everything in his mouth when playing in the yard.