The Claim

In 6–8 week old piglets, food restriction reduces serum concentrations of thyroxine (T4), free T4, and triiodothyronine (T3), increases reverse T3 (rT3) levels, and decreases the metabolic clearance and production rates of all triiodothyronines, indicating a systemic downregulation of thyroid hormone activity during energy deficit.

Source: Extrathyroidal conversion of thyroxine to 3,5,3'-triiodothyronine (T3) and 3,3',5'-triiodothyronine (rT3) and its contribution to total triiodothyronines production rates in fed and food restricted piglets.

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
8score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

How it works
1 study reviewed
In plain English

In 6–8 week old piglets, food restriction lowers levels of thyroxine and triiodothyronine in the blood, raises reverse T3 levels, and reduces how quickly the body produces and clears these hormones, resulting in decreased thyroid hormone activity during energy deficit.

See the scientific wording

In 6–8 week old piglets, food restriction reduces serum concentrations of thyroxine (T4), free T4, and triiodothyronine (T3), while increasing reverse T3 (rT3) levels, and decreases the metabolic clearance and production rates of all triiodothyronines, indicating a systemic downregulation of thyroid hormone activity during energy deficit.

Why this might work

When food is scarce, the thyroid gland releases less thyroid hormone, and the body changes how it processes the remaining hormone in tissues like the liver and muscle. Instead of turning the main hormone into the active form that drives metabolism, the body converts it into an inactive version. This lowers the overall amount of active hormone in the blood and slows down how quickly the body uses it, saving energy and preventing muscle loss.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: Extrathyroidal conversion of thyroxine to 3,5,3'-triiodothyronine (T3) and 3,3',5'-triiodothyronine (rT3) and its contribution to total triiodothyronines production rates in fed and food restricted piglets.

    When young piglets don’t eat, their bodies make less of the active thyroid hormone (T3) and more of an inactive version (rT3), and everything slows down to save energy — just like the claim says.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

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