Psoriasis is a long-term inflammatory skin condition that affects many people across the UK. It often appears as red, scaly patches on the skin and may cause itching, irritation, and discomfort. For many individuals, psoriasis can also affect confidence and overall quality of life.
Although psoriasis is mainly linked to immune system activity, research increasingly shows that other health factors can influence how severe the condition becomes. One of the most important of these factors is obesity. Studies have shown that people living with obesity are more likely to develop psoriasis, and individuals with a higher body mass index often experience more severe symptoms.
Emerging research also suggests that significant weight loss may help improve psoriasis in some patients. In particular, bariatric surgery has shown promising results in individuals who are living with both obesity and psoriasis.
The connection between obesity and psoriasis
Researchers have identified a strong relationship between body weight and psoriasis. Obesity is more common among people with psoriasis compared with the general population. In addition, individuals with a higher body mass index are more likely to experience severe forms of the condition.
One reason for this connection is inflammation within the body. Fat tissue is not simply a storage area for excess energy. It also releases inflammatory chemicals that circulate throughout the body. These substances influence immune activity and increase overall inflammation.
Psoriasis itself is an inflammatory condition driven by immune responses. When inflammation levels rise in the body, psoriasis symptoms may become more active. This overlap in inflammatory processes may explain why obesity can worsen psoriasis in some individuals.
Reducing excess weight may therefore help lower inflammation and support improvements in both overall health and skin symptoms.
Evidence from clinical observations
Clinical reports have observed improvements in psoriasis following significant weight loss after gastric bypass surgery.
In one case review, two patients with severe obesity and long-standing psoriasis were monitored after undergoing Roux-en-Y gastric bypass surgery. Both patients had a body mass index above 50 and had struggled with psoriasis for many years despite receiving multiple treatments.
One of the patients had severe plaque psoriasis affecting approximately 75% of the body. Managing the condition required intensive treatment, including strong topical steroid therapy and ultraviolet light-based treatments.
Following gastric bypass surgery and substantial weight loss, both patients reported clear improvements in their psoriasis symptoms. The severity of their skin lesions reduced significantly compared with their condition before surgery.
Although this report involved a small number of patients, it highlighted a possible link between weight loss and improvements in inflammatory skin disease.
Evidence from larger studies
A recent systematic review analysed results from 14 studies involving 169 patients with psoriasis who underwent metabolic and bariatric surgery. The most common procedures included gastric bypass and sleeve gastrectomy.
Across these studies, patients experienced significant weight loss after surgery. On average, body mass index decreased from 43.7 before surgery to 32.9 following treatment.
The review also found notable improvements in psoriasis outcomes. Approximately 97 percent of patients had mild psoriasis or complete remission after bariatric surgery, while only a very small proportion experienced worsening of symptoms.
Many patients continued psoriasis treatment after surgery. However, in many cases medications could be reduced to less intensive options such as topical therapies rather than stronger systemic treatments.
These findings suggest that substantial weight loss after bariatric surgery may have a meaningful impact on psoriasis severity for many individuals living with obesity.
Why weight loss may improve psoriasis
There are several biological reasons why psoriasis may improve after significant weight loss.
Fat tissue produces inflammatory substances known as cytokines. Some of these immune signals are involved in the development and progression of psoriasis. When body fat decreases, the production of these inflammatory chemicals also reduces.
Another factor involves a hormone called leptin, which is produced by fat cells and helps regulate appetite. People living with obesity often have higher leptin levels, and research suggests that leptin may contribute to inflammation within the immune system.
After significant weight loss, leptin levels usually decrease. Lower leptin levels may help reduce inflammatory activity in the body and support improvements in psoriasis symptoms.
Wider health benefits of weight loss surgery
Bariatric surgery is not considered a direct treatment for psoriasis. However, it can provide important health benefits for individuals living with obesity.
Many patients who undergo bariatric surgery experience improvements in several obesity-related health conditions. These may include type 2 diabetes, high blood pressure, sleep apnoea, and joint pain.
In some cases, inflammatory conditions such as psoriasis may also improve as overall inflammation in the body decreases.
When bariatric surgery may be considered
In the UK, bariatric surgery is typically considered for people with a body mass index of 40 or higher, or a body mass index of 35 or higher when obesity-related health conditions are present.
Each patient undergoes a detailed medical assessment to determine whether surgery is the most appropriate option.
Our Phoenix Health bariatric team focuses on providing personalised care and long -term support. From the initial consultation through recovery and lifestyle guidance, patients receive support throughout their weight loss journey.
Still unsure? Explore real before and after weight loss stories to see actual patient outcomes.
Takeaway
Research continues to highlight the strong relationship between obesity and inflammatory conditions such as psoriasis. Clinical observations and recent larger studies both suggest that significant weight loss after bariatric surgery may lead to improvements in psoriasis symptoms for many patients.
While results may vary from person to person, reducing excess body weight may help lower inflammation in the body and support better skin health alongside improvements in overall wellbeing.
For people living with obesity and related health concerns, discussing weight management options with a bariatric specialist may be an important step towards improving long-term health and quality of life.
References:
https://www.sciencedirect.com/science/article/abs/pii/S0190962210000137
https://www.sciencedirect.com/science/article/abs/pii/S0190962225021267
Medically Reviewed by Lujain Alhassan, BSc, ANutr
Registered Associate Nutritionist and Bariatric Nutrition
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