Haub's sample day
Espresso, Double: 6 calories; 0 grams of fat

Hostess Twinkies Golden Sponge Cake: 150 calories; 5 grams of fat

Centrum Advanced Formula From A To Zinc: 0 calories; 0 grams of fat

Little Debbie Star Crunch: 150 calories; 6 grams of fat

Hostess Twinkies Golden Sponge Cake: 150 calories; 5 grams of fat

Diet Mountain Dew: 0 calories; 0 grams of fat

Doritos Cool Ranch: 75 calories; 4 grams of fat

Kellogg's Corn Pops: 220 calories; 0 grams of fat

whole milk: 150 calories; 8 grams of fat

baby carrots: 18 calories; 0 grams of fat

Duncan Hines Family Style Brownie Chewy Fudge: 270 calories; 14 grams of fat

Little Debbie Zebra Cake: 160 calories; 8 grams of fat

Muscle Milk Protein Shake: 240 calories; 9 grams of fat

Totals: 1,589 calories and 59 grams of fat

Twinkies. Nutty bars. Powdered donuts.

For 10 weeks, Mark Haub, a professor of human nutrition at Kansas State University, ate one of these sugary cakelets every three hours, instead of meals. To add variety in his steady stream of Hostess and Little Debbie snacks, Haub munched on Doritos chips, sugary cereals and Oreos, too.

His premise: That in weight loss, pure calorie counting is what matters most -- not the nutritional value of the food.

The premise held up: On his "convenience store diet," he shed 27 pounds in two months.

For a class project, Haub limited himself to less than 1,800 calories a day. A man of Haub's pre-dieting size usually consumes about 2,600 calories daily.So he followed a basic principle of weight loss: He consumed significantly fewer calories than he burned.

His body mass index went from 28.8, considered overweight, to 24.9, which is normal. He now weighs 174 pounds.

But you might expect other indicators of health would have suffered. Not so.

Haub's "bad" cholesterol, or LDL, dropped 20 percent and his "good" cholesterol, or HDL, increased by 20 percent. He reduced the level of triglycerides, which are a form of fat, by 39 percent.

"That's where the head scratching comes," Haub said. "What does that mean? Does that mean I'm healthier? Or does it mean how we define health from a biology standpoint, that we're missing something?"

Despite his temporary success, Haub does not recommend replicating his snack-centric diet.

"I'm not geared to say this is a good thing to do," he said. "I'm stuck in the middle. I guess that's the frustrating part. I can't give a concrete answer. There's not enough information to do that."

Two-thirds of his total intake came from junk food. He also took a multivitamin pill and drank a protein shake daily. And he ate vegetables, typically a can of green beans or three to four celery stalks.

Families who live in food deserts have limited access to fresh fruits and vegetables, so they often rely on the kind of food Haub was eating.

"These foods are consumed by lots of people," he said. "It may be an issue of portion size and moderation rather than total removal. I just think it's unrealistic to expect people to totally drop these foods for vegetables and fruits. It may be healthy, but not realistic."

Haub's body fat dropped from 33.4 to 24.9 percent. This posed the question: What matters more for weight loss, the quantity or quality of calories?