Simple advice by photojournalist Lauren Crabbe:
A great food photographer makes the viewer want to reach into the magazine—or computer screen, or tablet—and take a bite of whatever the chef is making.
It helps to overexpose a little to make food looks tasty, and shooting it with a perspective that people are familiar with. If you’re camera has a macro function, shooting details often gives the viewer a better idea about the texture of the food hence making it more desirable. Shoot wisely.