Ketogenic Diet and Thyroid Function: A Delicate Metabolic Balancing Act.
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing mechanistic concepts without systematic search methodology or original clinical data.
PubMed 41020818 · doi:10.3390/cimb47090696
What was done
This narrative review summarizes literature regarding how ketogenic diets affect endocrine function and thyroid hormone regulation, focusing on insulin signaling, deiodinase activity, hypothalamic-pituitary-thyroid axis dynamics, and the modulating effects of sex differences, gut microbiota, and genetics.
What was found
The abstract reports no numerical findings or effect sizes. Qualitatively, the shift to fatty acid and ketone metabolism is described as altering deiodinase activity, reducing triiodothyronine (T3) levels, and altering hypothalamic-pituitary-thyroid axis dynamics, alongside potential metabolic effects such as reduced systemic inflammation and improved insulin sensitivity.
Why it matters
It draws attention to potential reductions in active thyroid hormone levels during ketogenic diets, suggesting that clinical application requires balancing metabolic benefits against potential thyroid axis disruption tailored to individual patient characteristics.
Limits
The review provides no original clinical data, meta-analysis, or systematic search parameters. The abstract lacks quantitative metrics, definitions of clinically significant T3 suppression, and clear risk estimates across different patient populations.
Cited by
- context Prolonged carbohydrate and caloric restriction can impair thyroid function, leading to symptoms such as cold intolerance and hair shedding.