Kitchen table to heavy

One of the projects I want to handle this winter is make a new kitchen table. The one I did the first time is of course used also as the front bed, so I made it way to heavy. I used plywood and then added pieces around the edge for width. It has laminate on it that matches my counter top. Any way I was wondering what they use from the factory when they make them. Any clue? Or have you made one for yourself? thanks.