If you're overweight and have Hashimoto’s thyroiditis, cutting back on carbs for three weeks might help you lose a little weight and lower your BMI, even if your thyroid hormones don’t change.

For overweight people with Hashimoto’s thyroiditis, cutting out carbs for three weeks might lower harmful antibodies in the blood, help them lose a little weight, and reduce their BMI — as if the diet is calming down their immune system and helping their body burn fat.

People who are overweight and have Hashimoto’s thyroiditis might lose more body fat if they eat more protein, fewer carbs, and avoid certain vegetables like broccoli and cabbage — even if they’re not eating fewer calories overall.

For people who are overweight and have Hashimoto’s thyroiditis, cutting back on carbs for three weeks might lower certain antibodies linked to thyroid inflammation — like a sign that the diet could be calming down the immune system’s attack on the thyroid.

In people who are overweight and have Hashimoto’s thyroiditis, many of those with high levels of immune antibodies also can’t digest milk sugar well — this might mean that trouble digesting carbs is connected to how the immune system attacks the thyroid, possibly through a specific biological pathway called ChREBP.