With two-thirds of U.S. adults overweight, it's not rocket science to conclude that we don't have a clue about how much to eat. But now there's a countertop gadget that looks a little like a kid's cooking set that is meant to help with portion control.

It's called Lifesize and was created by Myles Berkowitz, who'd had it with being overweight, and trainer Stephen Kates, who says, "You have to eat less food — that's the whole secret."

"Don't change what you eat; change how much you eat" sums up the idea behind Lifesize, a set of plastic measuring vessels marked for meats, toppings, saucy dishes and other categories of food. Six portions a day, same for men and women, plus a snack are allowed. Fruit and vegetables are generally unlimited.

Lifesize launched last year and is available for $79.99 online at www.lifesizeportions.com. It includes the containers, a chart, videos and other information.