[quote]brmnstl wrote:
Thyroid Questions
On a recent T-Nation article the author talks about low carb diets and T3 function.
I understand the concept but if I remember correctly you once went a year on very low to carbs. Was there any problems?
What is the validity to the T3 function and low carbs because I don’t handle carbs so well and respond better to the fruit or carb in the AM and at training time but no other time and do really well with a ketogenic like diet.
Should I be concerned in the long run to the T3 function??
thanks for the input.[/quote]
There is no such thing as “T3 function”…
See your body has two main thyroid hormones, T4 and T3 (and T2 to a smaller degree). T3 is the most active of these hormones, having an important role on metabolism and even protein synthesis.
However the body actually produce very little T3 directly. Rather it produces a lot of the less active T4. When it needs T3 it converts T4 into it.
The conversion of T4 into T3 is influenced by your carb intake meaning that if you are too low in carbs, the conversion is less efficient.
The best way to know when this happens is you body temperature. When it goes down by more than 1 degree it indicates that your T3 levels are probably running low. You will normally feel cold at that time.
Did I suffer these problems when I was on low carbs for more than a year? Yes, I was cold at some point, but I was very strict… meaning NO carbs… not even veggies. When I increased my carbs intake to 50g (mostly from fruits) the problem did went away.
With my dieting clients I have them take their body temp every morning and if it goes down by more than 1 degree and stays there for 3 days, I increase their carbs intake slightly until their body temp is back to normal.