How To Tackle Underactive Thyroid Weight Gain

How To Tackle Underactive Thyroid Weight Gain

Are you struggling with underactive thyroid weight gain? Failing to lose weight despite eating a healthy diet and exercising regularly can be frustrating and upsetting. Often, people with an underactive thyroid need to take a more sophisticated approach to managing their weight than simply reducing their calories.

As a team of nutritionists who specialise in weight loss, we support a lot of clients with underactive thyroid. The good news is, it is possible to regain control of your weight and your health. Here, we’ll share with you everything you need to know about underactive thyroid (also known as hypothyroidism) and addressing with the weight gain that often comes with it. 

If you’d like to work with a qualified weight loss expert to lose weight in a healthy and effective way, despite having an underachieve thyroid, we can help. Book in for a complimentary call today to find out more. 


Hypo means ‘low’, so hypothyroidism relates to reduced thyroid function. It is a condition that occurs when thyroid function is compromised, one of the consequences of which is the slowing of the body’s metabolism which can result in weight gain. If you’re looking to address underactive thyroid weight gain, there are several things you can do. But first, developing a deeper understanding of the condition can be helpful. 



Hypothyroidism is a condition where the thyroid gland produces insufficient levels of hormones, leading to a slower metabolism. Diagnosis involves a blood tests to measure hormone levels. It’s a common condition experienced mostly by women, however men can develop it too. The symptoms of underactive thyroid can significantly impact your quality of life. Below, we’ll take a look at some of the most common symptoms but it’s important to remember that while there are commonalities, everyone is different so you can have an underactive thyroid and not experience all of these symptoms.


Unlike hypothyroidism, hyperthyroidism is a condition where the thyroid gland produces too many hormones. This typically leads to weight loss. It can also cause difficulty sleeping, nervousness, and anxiety. In some cases, it can also cause heart palpitations, tremors, and sweating. These symptoms can also be experienced by people with an underactive thyroid when they are given a dose of thyroid medication that’s too high for them.


In addition to weight gain an underactive thyroid can also be linked with several other symptoms. Symptoms may include:


Sensitivity to the cold

Dry skin

Hair loss


Muscle weakness

In some cases, it underactive thyroid can also lead to depression, mood changes, and difficulty concentrating. If you’re experiencing any of these symptoms, it’s worth getting a comprehensive thyroid test. We offer an advanced thyroid test as part of our test offering. 


If you find out that you have an underactive thyroid, the first step is to visit your GP. Hypothyroidism is typically managed by doctors with a synthetic form of T4 thyroid hormone medication, known as levothyroxine. This replaces one thyroid hormone that is sometimes low in those with underachieve thyroid. While this can work for some people, for others it doesn’t provide a comprehensive enough solution to effectively manage their symptoms, including underactive thyroid weight gain.

At our clinic, we support our hypothyroid clients in optimising their diet and lifestyle to help manage their weight successfully. Our clients with hypothyroidism often have different nutritional requirements to those who don’t. Applying strategies tailored to your unique needs and health status is key.

It’s important to ensure that your body is getting optimal amounts of the nutrients it needs to produce thyroid hormones and support thyroid function. Low levels of certain nutrients can compromise the thyroid’s ability to produce thyroid hormones, or convert inactive T4 to active T3. We work with our clients to ensure their diet and supplements protocol provides all of the nutrients their thyroid needs.

Sometimes, underactive thyroid can be cause by an autoimmune condition known as Hashimotos. Specific dietary strategies can be taken to help manage autoimmune conditions. A tailored autoimmune paleo protocol (AIP) along with optimisation of gut health can be very supportive for people with autoimmune hypothyroidism.

Working with a nutritionist who understands hypothyroidism from a functional health perspective can help you manage your health and weight in a more holistic and often, more effective way.


Certain foods can help to support thyroid health and improve your metabolism, while others will promote weight gain.

Eating a diet focussed on whole foods, including nutrient dense vegetables, healthy fats, lean proteins and moderate amounts of low glycemic carbohydrates will help you manage underachieve thyroid weight gain. Here’s our guide to how to structure a balanced meal to support weight loss. In terms of what to avoid, minimise your intake of high sugar foods, refined and starchy carbohydrates, and ultra processed foods. (Here’s how to spot an ultra processed food).

Specific foods will provide your body with the raw materials it needs to produce vital thyroid hormones. Low levels can compromise thyroid hormone production. For example, foods that are high in iodine, such as fish and seaweed, can help support thyroid function as iodine is required for optimal thyroid function. Selenium-rich foods such as Brazil nuts, macadamia nuts, and tuna also support the thyroid. Lean proteins, leafy greens, eggs, healthy fats from salmon and walnuts, and whole grains can all help regulate thyroid hormones and boost metabolism to manage hypothyroidism-related weight gain.

On the other hand, some foods may negatively impact thyroid function. Soy products, for example, contain compounds that can interfere with thyroid hormone production, so working with a nutritionist to determine the foods to include or rule out of your diet can help to minimise hypothyroidism-related weight gain.


Along with dietary considerations, exercise can increase your metabolism, help regulate hormones, and support weight loss. They key is finding an exercise that works for you and ideally, that you enjoy. This will help ensure you stick to it on a consistent basis. If you’re new to exercise, start by aiming for around 30 minutes of moderate exercise every day, such as brisk walking or cycling. YouTube is full of different workouts that you can do at home without the need for a gym membership. If you feel as though you could benefit from expert guidance and accountability, seek the help of a qualified, experienced personal trainer.

While exercise is beneficial, it’s important to note that excessive exercise is not recommended. Overtraining causes the body stress, which can exacerbate hormonal imbalances and can further suppress thyroid function.


Consistently elevated levels of the stress hormone cortisol can inhibit thyroid function and potentially worsen the symptoms of underachieve thyroid. You can read more about how stress is linked to weight gain here. Practices like meditation, yoga, and deep breathing can all be helpful in managing stress levels. There are also supplements that can help to manage stress although you should speak to your doctor if you are on medication before adding new supplements into your routine. 


Certain nutrients are vital for thyroid health and function. Low levels of these nutrients have been shown to suppress thyroid function and deficiencies can be surprisingly common. Supplementing these nutrients can help to ensure you’re getting enough, though it’s important not to take too many. This is another reason why seeking help from a qualified nutritionist to help optimise your health and lose weight is so beneficial.

Nutrients required for thyroid function include iodine, selenium, zinc, vitamin A, B vitamins and vitamin D. Vitamin D deficiency is extremely prevalent and the government recommends that we all supplement it during autumn and winter months.

If you are taking medication, always speak to your doctor before taking supplements so that they can ensure any supplements you take won’t interfere with medications you are on. Some common thyroid medications, like levothyroxine, should always be taken away from food, drink and supplements.


We are a team of qualified nutritionists who specialise in weight loss. We consult clients in London and internationally via our virtual consulting room. Many of our clients have struggled to lose weight in the past due to health challenges like an underactive thyroid, or hormonal changes caused by the menopause. If you’ve been struggling, we can help you overcome your weight and health challenges, reach your desired weight, and maintain it long term.

Our Intelligent Weight Loss Method ensures you’re comprehensively supported in reaching your goal weight and maintaining it for good. If you’d like to explore how we can help you, please book in for a complimentary call to find out more.



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Sarah has worked with hundreds of clients over the past decade to help them live in a healthy body that they feel confident in.

Sarah spent a large part of her teens and 20’s as a professional dancer battling with orthorexia and an unhealthy relationship with food and her body. This created a desire to understand the human body more so she could finally cut through the confusion and end the cycle of yoyo dieting. This fuelled her passion to help other women do the same.


Sarah specialises in supporting women who are struggling to lose weight due to underlying health issues. She’s helped many women manage their weight during and after the menopause, as well as clients with thyroid disease and immune system dysfunction. Sarah loves food and sharing healthy recipes with her clients. Her aim is to ensure that clients don’t feel deprived and instead, achieve their weight loss and health goals in a positive and sustainable way.


To enquire about working with Sarah, please contact us.



Ailsa is one of our most experienced practitioners. She specialises in helping clients to lose weight, develop a healthy relationship with food and finally feel comfortable in their skin. Ailsa’s mission is for everyone she works with to enjoy the journey and that working with a nutritionist should not be a punishment, but your access to a new possibility.


Ailsa is not only an experienced weight loss nutritionist, she is also a skilled coach. She helps our clients overcome emotional eating, destructive habits and self-sabotaging behaviours that have prevented successful weight loss in the past. Ailsa has spent years in clinic working with clients who have experienced yo-yo dieting and have discovered that long term weight loss is not just about eating less until you can stand it no longer.


Working with Ailsa you will be comprehensively supported, not only in improving your nutrition and lifestyle, but also your eating habits and your relationship with food. When you work on all these elements together, the results can be truly astonishing.


To enquire about working with Ailsa, please contact us.

Test Nikki is our Practice Manager, managing our team of practitioners and heading up the day-to-day running of the business. Nikki is involved in the strategic development of our practice, coming from a strong business background in town planning. A Florida girl, Nikki relocated to the UK in 2014 with her husband and two children.



Nikki is our Practice Manager, managing our team of practitioners and heading up the day-to-day running of th clinic.


Nikki is involved in the strategic development of our practice, coming from a strong business background in town planning.


A Florida girl, Nikki relocated to the UK in 2014 with her husband and two children.


Stéphanie is a skilled nutritional therapist and functional medicine practitioner with additional training in eating disorders, disordered eating and obesity. She believes that working towards both physiological and mental health is key in achieving optimum wellbeing.


Stéphanie’s personal experience of emotional eating and the ongoing struggle to find the right support led her to combine the science of nutrition with behavioural coaching to motivate and empower her clients. She specialises in helping people who struggle with their weight and their relationship with food. She helps them develop a healthier and more peaceful relationship with food and their bodies.


To enquire about working with Stéphanie, please contact us.


Inna is passionate about supporting women on their journey to improved health and wellbeing. She believes that the solution to effective weight loss does not lie in ever more restrictive diets, but a more sophisticated approach that optimises health and vitality, as well as promoting effective weight loss.


Working with Inna you will benefit from her in-depth knowledge of female health and hormones. She will support you in developing a healthy diet, lifestyle and mindset that ensures you reach your ideal weight and maintain it in the years to come.


Inna is passionate about food with a wide repertoire of delicious healthy recipes and meal ideas to ensure your weight loss journey is as enjoyable as possible!


To enquire about working with Inna, please contact us.



Ania is a firm believer that improving your health and losing weight should be a positive, empowering journey, not one centred around deprivation.


After being diagnosed with two autoimmune conditions in her twenties, Ania spent several years educating herself on the power of food and nutrition. She put it all into practise and changed her diet and lifestyle, reversing her endometriosis and thyroid disease. After experiencing such a significant improvement in her health, Ania had a big desire to help others. She embarked on a four year journey to study nutrition, graduating from the Institute for Optimum Nutrition with distinction.


Ania specialises in autoimmunity and works with clients who have underlying health issues preventing successful weight loss. Her expertise enables her to successfully support our clients with conditions such as hypothyroidsm (underactive thyroid), PCOS and diabetes. 


To enquire about working with Ania, please contact us.

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