Raster’s right about iodine. The immune response that fights candida requires a lot of iodine, which is stripped off of thyroid hormone. Most people are deficient in the first place, and removing iodised salt pretty much removes any dietary source. Having a deficiency means immunity, thyroid function and even heavy metal detox suffers noticeably. Supplementing kelp in the region of 250-500mcg/day is a good starting point. Increasing the dose to many times that level can be beneficial, but it needs to be done very slowly (over many months) due to bromine toxicity and thyroid sensitivity, and preferably with testing (it’s risky if auto-immune problems are present). It’s also imperative to get about 200mcg/day of selenium. Don’t take iodine without this.
Studies have shown that low-carb diets lower T3 levels and can induce a hypothyroid-like state known as euthyroid sick syndrome. The initial stage of the protocol, which involves fasting and at least 2-weeks without carbs falls under this category, and people with iodine deficiency, active lifestyles or stress problems are especially at risk.
It’s also possible that hypothyroidism helps to create a beneficial environment for candida to overgrow, so it’s a bit of a chicken and egg scenario. I don’t know anything specific about thyroid medication, but it can be helpful in speeding up the recovery process. If you’re changing your diet and supplementing, it’s important to check your thyroid levels as regularly as you can.