If you search for how to lose weight with hypothyroidism, you’ll find countless tips: cut carbs, exercise, stay hydrated. While these can work for women with well-functioning thyroids and adrenals, they may not be as effective for those with hypothyroidism. In fact, restrictive diets and strenuous workouts could worsen your thyroid health. In this post, I’ll share some practical tips to to help you lose weight with hypothyroidism and what are common mistakes you should avoid.
Why I Can’t Lose Weight With Hypothyroidism?
Thyroid is like CEO of your body. It plays crucial role in supervising numerous body processes, including the speed at which your body detoxifies, digests food, produces energy, and burns calories. When your thyroid is underactive, your metabolism slows down, leading to reduced fat burning and energy use, regardless of diet or exercise. Additionally, high stress levels or suppressed emotions can elevate cortisol, which promotes more fat storage, making weight loss even more challenging.
Can Levothyroxine Can Help You Lose Weight With Hypothyroidism?
It works for some but not for majority unfortunately. Levothyroxine, is a synthetic form of T4, which is an inactive thyroid hormone. If your body struggles to convert T4 to the active form, T3, you may still experience hypothyroidism symptoms like weight gain or tiredness. Free T3 is the active form of thyroid hormone needed for a fast metabolism and effective weight loss.
Common Weight Loss Mistakes
Common mistakes that a lot of women do when trying to lose weight with hypothyroidism is dramatically cutting calories or engaging in high-intensity training like cross fit, heavy weight lifting or simply exercising too much.
Maybe you can lose a bit of weight with this approach, but sooner or later, your weight loss will plateau, and with each subsequent attempt, it will become harder and harder to shed those extra pounds. I always recommend a gentler approach. And here’s why.
Hypothyroidism Is Often a Symptom Of Other Imbalances in Your Body
Hypothyroidism rarely occurs in isolation. It often result from other underlying issues such as:
- Hormonal imbalances like excess estrogen and low progesterone
- Adrenal fatigue
- High cortisol levels
- Vitamin and mineral deficiencies
- Digestive and gut health problems
- Liver dysfunction
- Chronic inflammation caused by imbalanced omega-6:3 ratios, toxins, parasites, viruses, and food intolerances
Negative Impact on Hypothyroidism of Low Calorie Diets and Excess Exercise
Restrictive diets, fasting, and excessive exercise can further stress your thyroid and adrenals, exacerbating hypothyroidism symptoms and making weight loss much harder.
For example, severe calorie restriction may lower T3 levels while increasing reverse T3, which blocks T3 activity – that means slower metabolism and slower or even impossible weight loss!
The study has shown that serum T3 decreased by as much as 66 percent in the group of women with very low calorie diet, whereas rT3 increased by as much as 27 percent.
Then another studies showed that high intensity exercise (90% of max heart rate) caused TSH to increase and T3 and Free T3 to decrease. That as mentioned earlier will slow down metabolism and your weight loss.
How To Optimise Your Diet and Exercise To Lose Weight With Hypothyroidism?
I generally don’t recommend cutting your daily calorie intake by more than 20% if you want to lose weight with hypothyroidism. If it comes to exercise try not to exceed your max heart rate by 70%. Instead of overly intense workouts, focus on gentle, consistent exercise for 45–50 minutes, such as vinyasa yoga, jogging, weightlifting, climbing, or cycling.
You can watch my video here on how to workout to lose weight and fat effectively with hypothyroidism and other hormone imbalances:
What Is the Best Diet for Weight Loss with Hypothyroidism?
There’s no one-size-fits-all solution because the root causes of hypothyroidism vary. And the best diet is the one that will address those imbalances. As mentioned earlier, low thyroid function can stem from various issues, including insufficient building blocks like tyrosine and iodine, vitamin and mineral deficiencies, poor T4-to-T3 conversion, elevated reverse T3, receptor resistance to T3, adrenal dysfunction, or liver and gut issues.
However, there are still some general nutritional and lifestyle guidelines that can support your thyroid health and kickstart your journey to lose weight with hypothyroidism
Nutrients to Improve Hypothyroidism:
- Iodine-Rich Foods
Iodine is a key building block of thyroid hormones. However, if you’re not eating seaweed or certain fish, it’s challenging to meet the recommended daily intake of 150 mcg. Exercise increases iodine requirements since you lose it through sweat. But beware—frequent fish consumption isn’t ideal due to mercury contamination. Find out here which fish are safest and most contaminated with heavy metals. - Tyrosine-Rich Foods
Together with iodine, tyrosine forms thyroid hormones. Foods like chicken, turkey, and avocados are excellent sources of tyrosine. - Zinc and Copper
These minerals aid thyroid function. Include organ meats, beef, shellfish, mushrooms, sweet potatoes, and sesame seeds in your diet. - Selenium
Selenium is crucial for converting T4 to T3 – the active thyroid hormone responsible for your fast metabolism and burning excess fat. Brazil nuts are an excellent source. Choose producesif they’re from Brazil, as soils elsewhere often lack selenium. - Vitamins A and D
These vitamins are essential for optimal T3 receptor function, allowing hormones to enter cells. Sources include organ meats, eggs, butter, carrots, sweet potatoes, and butternut squash.
Here you can read more about hypothyroidism diet.
Other Hypothyroidism-Friendly Foods:
- Low-Glycemic, Low-Carb Options
High sugar and high carb foods elevate insulin, which can impair T4-to-T3 conversion, lowering free T3 levels and hindering weight loss. Read more about insulin as a hidden cause of hypothyroidism here. However don’t cut carbs out completely as that can also suppress your thyroid function – moderation is the key and choose complex carbs like quinoa, sweet potatoes for example as they don’t spike insulin as much as simple sugars. - Healthy Fats
Incorporate polyunsaturated fats (fish oil, flaxseeds, chia seeds), monounsaturated fats (avocado, olive oil), and some saturated fats (butter, coconut oil). Click here for more tips on balancing omega-6 and omega-3 – also super important if it comes to losing weight with hypothyroidism as excess omega 6 increases inflammation. Inflammation = difficult to lose weight. - Organic Produce
Choose organic fruits and vegetables when possible, as they contain more trace minerals and fewer pesticides. Pesticides can disrupt hormone production, impair detoxification, and damage gut health—a key component of effective thyroid hormone conversion
Check out the most contaminated fruits and vegetables in the UK here.
Foods to Limit or Avoid with Hypothyroidism:
- Raw Goitrogenic Foods
Cook goitrogen-rich foods like kale, spinach, broccoli, and cauliflower to reduce their thyroid-inhibiting properties. - Soy Products
Soy, especially GMO varieties, can inhibit thyroid hormone conversion. - Vegetable Oils
Avoid cooking with polyunsaturated oils like corn, soy, rapeseed, or sunflower oil. These oils can suppress thyroid function and, when heated, turn into harmful trans fats. - Excess Estrogen
Limit exposure to xenoestrogens in plastics, birth control pills, and hormone replacement therapies. Excess estrogen increases thyroid-binding proteins, reducing the availability of free thyroid hormones.
Balance Cortisol To Lose Weight With Hypothyroidism
Another important aspect that can help you lose weight with hypothyroidism massively is managing your cortisol levels (your stress hormone). High cortisol will simply prevent you from losing weight. In 95% cases of women with hypothyroidism I see, high cortisol plays a huge role. High circulating cortisol in my system was also a big factor for me and my hypothyroidism – addressing that was truly life changing! DUTCH test is a great test that can help you get insight into your cortisol out put, cortisol metabolism and daily cortisol pattern.
So what can you do to make sure your cortisol is balanced?
There is lots of things but lets focus on the most important ones:
- Getting enough sleep and ideally going to bed before 11pm. You can read here my other blog post with more tips how to unwind in the evening and improve your sleep
- Breathwork – one of mu best way to regulate my nervous system, build stress resiliance and keep cortisol in check.
- Never have coffee on empty stomach. Coffee on empty stomach can skyrocket your cortisol which will definaetly not help you with losing weight.
Final Thoughts
I hope these insights were helpful! Remember, these tips can help you start losing weight with hypothyroidism, but ultimately addressing the root causes of hypothyroidism is the key to sustainable and EASY weight loss!
If you’d like to get a personalised hypothyroidism healing protocol for successful weight loss based on your unique needs and imbalances – book a FREE Clarity session with me and we can chat about how I could help you:)