Possible Clues:

• Undergo alteration in form
• It turns your stomach to have eaten this for a change
• It would turn one's stomach before one ate it for a change
• Space traveller with a stomach upset will undergo change
• It's enough to turn your stomach if you swallowed it for a change
• Genetically modify a mongrel without a sign of energy
• That'll turn your stomach, what you ate for a change
• Change dramatically
• It would make a change for it to turn your stomach before you swallowed it (6)
• Just for a change it turned your stomach when you ate it