Does this mean we're yo-yo dieting?

Remember how Houston was ranked the nation's fifth-fattest city by Men's Fitness magazine this year? If that's been getting you down all year, you'll love this: According to a new list, Houston is the third-slimmest city in the country. The news shocked us so much that we nearly dropped the box of Ho Hos we were snacking on.

The new report ranks cities by their average residents' body mass indexes. The title of slimmest city goes to Roseville, Calif.; our friends in San Francisco are No. 2, and the Bayou City comes in at No. 3. If that's not enough of a shock for you, two Houston suburbs finish out the top five: Missouri City in fourth place and Sugar Land in fifth. That's great and all, but we somehow doubt Houstonians are equally as trim as San Franciscans. They have hills out there, after all, and they walk a lot.

According to the list, Rosewood, SF and Houston residents all have average BMIs of 24.8, which falls in the "ideal" range. (To figure your BMI, convert your height to meters and your weight to kilograms, then divide your weight by the square of your height.) Unfortunately, KTRK didn't tell who compiled this list, and we couldn't find anything about it online. We'll let you know if we get more information — or if you know anything, tell us in the comments section. In the meantime, we're going to reconsider that bacon cheeseburger we had last night.