Thyroid Optimization: T3/T4 Ratios

TropicStrength · Post by **TropicStrength** » Sat Jan 24, 2026 2:30 am

My TSH is 2.5, but my Free T3 is at the very bottom of the range. I feel sluggish. Is this "functional" hypothyroidism?

AndeanLifter · Post by **AndeanLifter** » Sat Jan 24, 2026 3:40 am

Are you in a deep calorie deficit? The body will downregulate T4 to T3 conversion to save energy.

MedellinMuscle · Post by **MedellinMuscle** » Sat Jan 24, 2026 4:30 am

Check your Selenium and Iodine intake. Those are co-factors for the deiodinase enzymes.

CaliFlex · Post by **CaliFlex** » Sat Jan 24, 2026 5:20 am

What about Reverse T3? If that is high, it's blocking your Free T3 from working.

LatinoBulk · Post by **LatinoBulk** » Sat Jan 24, 2026 6:10 am

Cortisol is the main driver of high Reverse T3. Are you overtraining?

TropicStrength · Post by **TropicStrength** » Sat Jan 24, 2026 6:50 am

I have been pushing it hard. 6 days a week, heavy loads. Maybe a deload is overdue.

AndeanLifter · Post by **AndeanLifter** » Sat Jan 24, 2026 7:35 am

Try taking a full week off and bumping your carbs. Carbs are essential for thyroid conversion.

MedellinMuscle · Post by **MedellinMuscle** » Sat Jan 24, 2026 8:15 am

Insulin helps the liver convert T4 to T3. Low carb = low T3.

CaliFlex · Post by **CaliFlex** » Sat Jan 24, 2026 8:55 am

I learned that the hard way. Keto killed my metabolism.

LatinoBulk · Post by **LatinoBulk** » Sat Jan 24, 2026 9:40 am

The scale moves down but your energy moves to zero.