Hyperthyroidism: what to eat

An overactive thyroid can raise energy needs and may bring sweating, diarrhoea, anxiety or poor sleep. These effects can make it harder to maintain weight, replace fluids and eat consistently. Food cannot correct the thyroid hormone excess, and no single ingredient treats it. The right plan depends on your appetite, weight change, symptoms, other conditions and treatment. Avoid starting high-dose supplements, especially those containing iodine, unless a clinician has recommended them.

Aim for meals containing a protein source, vegetables or fruit, and a starchy food such as rice, bread, oats or potatoes. If your appetite is low, smaller meals and nourishing snacks may be easier. Replace fluid lost through sweating or loose stools with regular drinks; a clinician or pharmacist can advise on oral rehydration when needed. Include calcium-rich foods such as dairy or suitable fortified alternatives, and ask whether vitamin supplementation is appropriate. Keep caffeine modest if it worsens palpitations, tremor or sleep.

Contact a clinician if ongoing weight loss, frequent diarrhoea, vomiting, marked weakness or difficulty eating is developing. Seek urgent help for confusion, fainting, chest pain, severe breathlessness, a very fast or irregular heartbeat, or inability to keep fluids down. These problems need assessment rather than dietary experimentation.

Do I need a dietitian or a tailored meal plan? Should I avoid any iodine-containing supplements or medicines? How much fluid and calcium is suitable for me, and could my symptoms reflect treatment or another problem?