The folks over on the thin page complain all the time about being cold.
I think it's to do with your energy reserves as well as body fat. If you eat 0 cals, you will have 0 cals to keep your body warm with. Some eating disordered folks develop Raynaud's Syndrome (bad circulation leading to constantly cold extremities) purely as a result of their disorder.
I find that I feel coldest in my appartment just before dinner, I complain that it's cold etc, then suddenly, 15 mins after eating, I'm not cold anymore. Alcohol also lowers body temperature, hence the "cold at 2am" phenomenon where everyone at a party in flimsy club gear suddenly starts to freeze lol. And my bodyfat isn't particularly low.
If you eat every 2 hours OTOH this should keep your metabolism, and therefore your heat generation, ticking over nicely, compensating for the lower body fat of you in-shape chicas.