The Claim
Ten days of total energy deprivation in healthy, normal-weight males is associated with early and marked reductions in blood triiodothyronine (T3) levels and increases in reverse T3 (rT3) levels, with rapid return to baseline after refeeding.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In healthy, normal-weight men, ten days of complete fasting causes a significant drop in triiodothyronine (T3) and a rise in reverse T3, and these changes reverse quickly when eating resumes.
See the scientific wording
Ten days of total energy deprivation in healthy, normal-weight males is associated with early and marked reductions in blood triiodothyronine (T3) levels and increases in reverse T3 (rT3) levels, with rapid return to baseline after refeeding, suggesting a metabolic adaptation to conserve energy during fasting.
When no food is consumed, the brain detects low energy and reduces signals that activate the thyroid gland. This causes the body to stop converting the main thyroid hormone into its active form and instead produce an inactive version. The active hormone drops, the inactive one rises, and the body uses less energy. When eating resumes, this switch reverses immediately.
What the research says
1 studyWhen healthy men don't eat for 10 days, their bodies slow down their metabolism by lowering the active thyroid hormone and raising the inactive kind, so they use less energy. As soon as they start eating again, everything goes back to normal.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.