Leslie promises to pay her friend Gene $10,000 if Gene refrains from eating any foods that contain Yellow Number 5 food coloring for six months. Gene agrees, performs her part of the bargain, and asks for the money. Leslie refuses to pay, saying there was no valid consideration and therefore the agreement is unenforceable. Is there an enforceable contract between Leslie and Gene (in other words, was there valid consideration - don't worry about whether Gene can "prove" her case)?