Hyperthyroidism Diet Guide

An overactive thyroid that speeds up the body, which can cause weight loss, a fast heartbeat and weaker bones over time.

⚕️ Medical disclaimer: This guide provides general nutritional information and is not a substitute for personalised medical advice. Always consult your healthcare team before making significant dietary changes.

✓ What to Eat

✓ Regular, filling meals and snacks

Helps meet higher energy needs and avoid unwanted weight loss while the thyroid is overactive

✓ Calcium-rich foods (milk, yoghurt, cheese, fortified alternatives)

Supports bone health, which an overactive thyroid can affect

✓ Vitamin D sources (oily fish, eggs, fortified foods)

Works with calcium to support bones — the NHS advises a daily vitamin D supplement in autumn and winter

✗ What to Avoid

✗ Kelp, seaweed and iodine supplements

Very high in iodine, which can affect thyroid levels — avoid unless your doctor advises them

✗ Lots of caffeine

Can make a racing heart, shakiness and anxiety feel worse

Practical Tips

💡 Follow your care team's advice

If you are having radioactive iodine treatment you may be given a short low-iodine diet — follow their instructions

💡 Check before taking supplements

Ask your pharmacist about supplements, as some contain iodine or can affect thyroid medicines

Get a meal plan built around your Hyperthyroidism

EatByCondition generates personalised, AI-powered diet plans designed specifically for your conditions — not generic templates.

Start Free — No Card Required