The Science of Shopping

This article talks a lot about people's tendencies to touch, or pet articles of clothing before purchasing them, so therefore stores place items on tables to make this action easier. The author explains that this is because we tend to eat, and pick up food on tables, but why are these two actions related? When we sit down to eat, do we poke and prod our food before consuming in the same way we evaluate a shirt or pair of jeans for comfortability? What is it about touch that is so critical in our evaluation of a product?