Why weight goes up with thyroid

Many people with hypothyroidism keep gaining weight even after their TSH comes under control with medicine. An underactive thyroid slows metabolism, so the body uses less energy and stores more. Tiredness then makes people move less, and cravings for quick energy (tea with biscuits, sweets, fried snacks) add extra calories.

Medicine corrects the hormone level, but it does not undo these habits. That is where food and daily routine make the real difference.

What to eat

You do not need special foods or expensive supplements. Regular Indian home food works well when meals are balanced.

  • Protein at every meal: dal, chana, rajma, paneer, curd, eggs, sprouts or chicken. Protein keeps you full and protects muscle while you lose weight.
  • Plenty of fibre: sabzi, salad, fruit and whole grains like bajra, jowar and daliya. Fibre also helps with the constipation many thyroid patients have.
  • Iodised salt in normal amounts: most people get enough iodine this way. Take extra iodine only if your doctor advises it.
  • Selenium and zinc from food: a few nuts and seeds (sunflower, pumpkin, flax), eggs, dals and curd.
  • Smaller portions of roti and rice: no need to stop them. Fill half the plate with sabzi and salad, a quarter with protein, and the rest with roti or rice.

A simple day might look like this:

  • Breakfast: moong dal chilla with curd, or vegetable poha with sprouts
  • Mid-morning: a fruit and a few nuts
  • Lunch: 2 rotis, dal, sabzi, salad and curd
  • Evening: roasted chana or buttermilk
  • Dinner: paneer or chicken with sabzi and 1 roti, at least 2–3 hours before bed

Common myths

  • "Stop eating cabbage and cauliflower." Cooked cabbage, cauliflower and broccoli are fine for most people in normal amounts. Only very large amounts of raw vegetables are a concern.
  • "Soya is not allowed." Normal amounts of soya chunks or tofu are fine for most people. Keep a gap between soya and your thyroid tablet.
  • "Everyone with thyroid must go gluten-free." Only if you have been diagnosed with celiac disease. Otherwise there is no need to give up wheat.
  • "Milk must be stopped." Not by default. Adjust it only if it upsets your stomach, and keep a gap between milk or calcium and your tablet.

Daily routine that helps

  1. Take your tablet the way your doctor advised, usually on an empty stomach with water, with a gap before breakfast, tea or coffee.
  2. Keep a longer gap before calcium or iron supplements, as your doctor suggests, because they can reduce how well the tablet works.
  3. Eat at regular times. Long gaps lead to overeating and cravings later in the day.
  4. Move every day. A 30–40 minute walk, plus simple strength exercises 2–3 times a week, helps protect muscle and metabolism.
  5. Sleep 7–8 hours. Poor sleep increases hunger and tiredness.
  6. Get your thyroid profile checked as your doctor advises, and tell them if your weight or energy changes a lot.

The bottom line

Thyroid medicine and a good diet work together. With balanced home food, regular meals, daily movement and patience, most people with hypothyroidism can lose weight steadily and feel more energetic. Progress may be a little slower than for others, so focus on small changes you can keep up.

If you have thyroid along with PCOD, high cholesterol or diabetes, a personalised diet plan can make the process much easier.

Dietitian Arti Kalra is a certified dietitian and nutritionist in Sector 77, Noida, who makes home-food diet plans for thyroid, PCOD, diabetes and weight loss. This article is for general information and does not replace advice from your doctor.