Food marketing has always been highly dependent on good visuals. That's why there is an entire industry dedicated to taking professional shots of food for restaurants, food producers and chefs. A marketing piece can't convey, outside of copy, smell, texture or taste. But great visuals can suggest them.
Food photography, too, focuses on placing eats in an emotional context. The lighting, the focus, the depth of field and the image background all help to instill in the viewer a particular expectation of the sampling experience.
Are you marketing rusticism? Are you marketing fresh and natural? Are you marketing a restaurant to young, dating couples? Or food truck fare to hungry Millennials? The right, professionally-produced image can bring customers flocking.