What Causes Hair Loss and Weight Gain: Common Triggers Revealed

WrittenbyLuat Duong
Last updated

Most of us are quick to notice changes in our body, especially when they involve our appearance or energy levels. Two such noticeable changes include unexpected weight gain and hair loss. In some cases, these issues might occur simultaneously, raising concerns and questions. In this comprehensive article, we delve into the causes behind such changes, specifically answering the question: What causes hair loss and weight gain?

What Causes Hair Loss and Weight Gain?

While it may seem these two symptoms are unrelated, certain underlying health issues like thyroid disorders, iron or vitamin deficiencies, and even chronic conditions like diabetes can cause both hair loss and weight gain. Additionally, lifestyle factors such as stress and diet can play a significant role in triggering these conditions.

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Understanding the Role of Thyroid Disorders

Thyroid disorders, specifically hypothyroidism and hyperthyroidism, can significantly affect your metabolism, leading to weight fluctuations and hair health. Hypothyroidism, characterized by low thyroid hormone levels, can cause weight gain, hair loss, and fatigue due to metabolic slowdown. On the other hand, hyperthyroidism, characterized by high thyroid hormone levels, typically results in weight loss, but in some cases, can cause weight gain due to increased appetite.

Iron and Vitamin Deficiencies

Iron deficiency anemia and vitamin B12 deficiency can also cause hair loss and weight gain. Iron is critical for the production of hemoglobin, which carries oxygen to different parts of your body, including hair cells. A deficiency can lead to hair loss and a sluggish metabolism, resulting in weight gain. Similarly, Vitamin B12 deficiency can lead to fatigue, weakness, and hair loss. While it typically causes weight loss, research suggests that low B12 levels may contribute to weight gain in certain groups.

The Impact of Diabetes

Diabetes, a chronic condition characterized by high glucose levels in the blood, can interfere with how your body converts food to energy. This could lead to weight gain, especially if insulin therapy is part of the treatment approach. The disease can also cause fatigue and damage to blood vessels, making it difficult for your blood to carry oxygen and nutrients to your cells, including hair cells, which can lead to hair loss.

Lifestyle Factors: Stress and Diet

Stress and diet are also crucial factors that can trigger hair loss and weight gain. Chronic stress can disrupt various body functions, including hair growth and metabolism, leading to hair loss and weight gain. A diet lacking essential nutrients can also affect hair health and contribute to weight gain over time.


In conclusion, numerous factors can cause hair loss and weight gain simultaneously. While thyroid disorders, vitamin deficiencies, and diabetes are common culprits, it's important not to overlook the impact of stress and diet on our overall health. If you notice unexpected changes in your weight or hair, it's advisable to consult with a healthcare professional. Not only will they provide a proper diagnosis, but they can also suggest effective treatment options and lifestyle changes for improved health and wellbeing.

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Luat Duong

Luat Duong is a Copenhagen-based writer and content strategist specializing in hair loss and health. His work has been featured in MyHealthGuide, The Right Hairstyles, and Woman's Era. He is a graduate of Vaasa University. You can connect with him on LinkedIn.