A nutritionist out to prove a point has lost 27 pounds on what he's calling a Twinkie Diet.  His point? It's not what you eat, but how much.

Mark Haub spent 10 weeks chowing down junk food galore.

"Little Debbie snack cakes, mini bars, nutty cakes, fudge rounds.you name it," he said.

While much of the food was junk, he made sure he consumed no more than 1,800 calories a day -- most folks eat 2,600 or more. Along with the 27 pounds he lost, his bad cholesterol also dropped 20 percent.

The Kansas State University nutritionist wanted to demonstrate that regardless of the type of food you eat, if you just cut your calorie intake, you're likely to lose weight.

However, critics responded that the Twinkie Diet long-term will harm most people.

"Their immunity will go down, they will be at a greater risk for cancer, for heart disease, and then they will probably end up gaining weight," said Keri Glassman, a registered dietician.

Haub pointed out that he isn't recommending the Twinkie Diet. He just wanted to make his point.

It also helps to know he was sneaking in vitamins, veggies, protein shakes and exercise along with his intake of junk food.