Andrew Huberman· PhD
The point is that carbohydrates, starchy carbohydrates in particular, support the healthy production of T3 and T4. And so if you're very low carbohydrate, you're going to have a reduction in T3 and T4.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
The point is that carbohydrates, starchy carbohydrates in particular, support the healthy production of T3 and T4. And so if you're very low carbohydrate, you're going to have a reduction in T3 and T4.
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But for most people that don't consume any carbohydrate, T3, T4 are going to go down.