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Best Answer: Yes there is a link between having an underactive thyroid and having high cholesterol. In someone with high cholesterol, thyroid function is usually one of the first things that gets investigated.
Excess sugar can be harmful to the thyroid gland. High sugar foods should be avoided with an underactive thyroid. Caffeine, which is found in coffee and chocolate, is also something to try not to consume a lot of when you have hypothyroidism.