The Claim

In growing pigs under food restriction, elevated serum 3,3',5'-tri-iodothyronine (rT3) levels are primarily due to reduced hormone degradation or increased thyroid secretion rather than increased peripheral conversion from thyroxine (T4).

Source: Reciprocal changes in serum 3, 3', 5'-tri-iodothyronine concentration and the peripheral thyroxine inner ring monodeiodination during food restriction in the young pig.

What the research says

Roughly balanced

Support and challenge are close. The picture may shift as more studies come in.

Supports
6score
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 food-restricted growing pigs, high levels of the hormone rT3 in the blood result from slower breakdown of the hormone or greater release from the thyroid gland, not from conversion of another hormone called T4.

See the scientific wording

In growing pigs under food restriction, elevated serum 3,3',5'-tri-iodothyronine (rT3) levels likely reflect reduced hormone degradation or increased thyroid secretion rather than increased peripheral production from thyroxine (T4).

Why this might work

When food intake drops, the thyroid releases more rT3 into the blood, and the liver and kidneys slow down how fast they break it down. This causes rT3 to build up in the blood even though the body is not making more of it from T4.

Supported mechanismbased on 1 study

What the research says

1 study

  1. Study: Reciprocal changes in serum 3, 3', 5'-tri-iodothyronine concentration and the peripheral thyroxine inner ring monodeiodination during food restriction in the young pig.

    When pigs eat less, their blood has more rT3, but their liver and kidneys aren’t making more of it — they’re actually making less. So the rise must be because their bodies aren’t breaking it down as fast, or their thyroid is releasing more of it.

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

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