You’ve probably heard of the so-called “fat” hormone, leptin. Leptin is produced in fat cells. It sends a signal to the brain’s control center, the hypothalamus, about our nutritional status. High levels mean we have enough fat stores. All is well. No need to eat. Falling leptin levels, on the other hand, send the opposite message: Uh oh. Fat stores are depleted. Time to eat. At least, that is the way it is supposed to work.

Here is the catch. Most overweight people have higher blood leptin levels than normal weight people. And they have a condition called leptin resistance. That means that the cells in their brain that would get the leptin signal of “enough” aren’t receiving it. Their bodies think they are starving. That does two things: it makes them hungry, so they eat more, and it slows their metabolism, as their body shifts into starvation mode and starts to conserve energy.

The slowed metabolism happens via slowed thyroid hormone function in cells. It is not detected by standard thyroid function tests, including the most common one, TSH. It includes diminished TSH secretion, suppressed T4 to T3 conversion, increased appetite and insulin resistance and inhibited fat breakdown. Thus, it’s possible to have leptin resistance and Wilson’s Temperature Syndrome despite the fact that standard thyroid tests look “normal”. If you are not able to lose weight despite dieting, there may be a problem with your body temperature and leptin resistance that might respond to treatment.

I believe there is a way to override this leptin-thyroid feedback loop. First, take your body temperature. (For instructions on how to do this correctly, see “How are body temperatures measured” on our website.) If your body temperature is consistently low—below 98.5 F., or 36.94 C, but typically lower than 97.8 F, or 36.56 C.— there’s a good chance that you have low metabolism and low thyroid hormone function.

That is something you can correct, usually with a course of the natural, active form of thyroid hormone, T3. This is different than the usual prescription form of thyroid, T4 (Synthroid or levothyroxine) and for some people, it works better. Like T4, however, T3 requires a prescription and medical supervision.

Correcting your body temperature with T3 will make everything work better. It will restore your metabolism to normal and help you to lose weight, which in turn will reduce leptin resistance. That, in turn, will help your body naturally to use thyroid hormone more effectively.

You can discuss using T3 with your doctor and we will be happy to discuss your case with your doctor. Your doctor can call 800.420.5801 to find out more about T3 therapy. Our website can also help you locate a doctor closest to you who has been trained in thyroid issues.

REFERENCES
Groba C, Mayerl S, van Mullem AA, et. al. Hypothyroidism compromises hypothalamic leptin signaling in mice. Mol Endocrinol. 2013 Apr;27(4):586-97.

Jéquier E. Leptin signaling, adiposity, and energy balance. Ann N Y Acad Sci. 2002 Jun;967:379-88.

Kozłowska L, Rosołowska-Huszcz D. Leptin, thyrotropin, and thyroid hormones in obese/overweight women before and after two levels of energy deficit. Endocrine. 2004 Jul;24(2):147-53.

“Weight loss” at http://www.holtorfmed.com/weight-loss/