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This checklist of 10 reasons your internal thermostat is out of whack can help you get a handle on why you're chronically freezing your butt off. You're too thin Low body weight — defined as a BMI hovering around 18.5 or under — can chill you out for a couple of reasons. First, when you're underweight, you lack an adequate level of body fat to insulate you from cold temperatures, explained Maggie Moon, RD, a Los Angeles – based nutritionist. The other thing is, to maintain that low BMI, you have to reduce your food intake so you likely aren't eating very much at all. Skimping on calories puts the brakes on your metabolism, so you don't create enough body heat. Consider putting on a few pounds by loading up on whole, healthy foods that contain lots of protein, fat, and complex carbohydrates. RELATED : Subtle Signs of Eating Disorders Your Thyroid is out of whack Add cold intolerance to the long list of health issues you can blame on the butterfly-shaped gland in your neck. Always being cold is a telltale sign of hypothyroidism, which means Your Thyroid doesn't secrete enough thyroid hormone.