Did normal thyroid function affect micronutrient changes during a 60-day intervention in adults aged 18–45?

What we’ve found so far suggests that when thyroid hormone levels stay within the normal range, they don’t appear to be a factor in how micronutrient levels shift during a 60-day health or fitness intervention. This doesn’t mean thyroid function has no role in nutrient metabolism overall — only that, in this specific group and timeframe, normal thyroid activity didn’t seem to affect the changes observed.

The evidence we’ve reviewed is limited to a single assertion, even though it’s supported by a large number of data points. We don’t know if this applies to people with thyroid conditions, older adults, or longer interventions. We also don’t know which micronutrients were measured or what kind of intervention was used — those details could matter.

For now, if you’re a healthy adult between 18 and 45 with normal thyroid function and you’re making lifestyle changes over two months, your thyroid likely isn’t the reason your nutrient levels are shifting. But if your thyroid isn’t normal, or if you’re outside this age range, we can’t say what’s happening based on what we’ve seen so far.