If your mouth has ever watered and your stomach has ever grumbled just from eyeing a picture of a big slice of cheesecake, here’s your explanation: Just looking at pictures of fattening foods is enough to make us hungry, a new study shows. Research presented at the annual meeting of the Endocrine Society shows that seeing high-calorie items stimulates the appetite control center, which then makes us crave food. The finding applies to everyone, considering the current environment is…