When we talk about belly fat, the conversation often veers toward heart health, diabetes, or metabolism. But did you know that what's around your midsection could also be setting the stage for psoriasis?
A recent study led by King’s College London, published in the Journal of Investigative Dermatology, brings intriguing news. Data from over 330,000 UK adults, including 9,000+ with psoriasis, were analysed using 25 different body-fat measurements. Whether it's waist circumference, waist-to-hip ratio, or abdominal fat via imaging, the “spare tire” in the midsection emerged as a stronger predictor of psoriasis than overall BMI.
Our research shows that where fat is stored in the body matters when it comes to psoriasis risk. Central fat, especially around the waist, plays a key role.Dr. Ravi Ramessur, Lead Researcher, St John’s Institute of Dermatology, King’s College London
A Closer Look at the Central Fat–Psoriasis Connection
Independent of genes: Whether participants had genetic markers like HLA‑C06:02 or not, central fat independently increased risk.
BMI misses the mark: BMI can’t tell where fat is stored. Two people with the same BMI, one with belly fat and one with peripheral fat, have different psoriasis risks.
Women are more affected: The impact was notably stronger in women, hinting at hormonal or immune differences.
Numbers matter: One study argued that every one‑unit increase in Relative Fat Mass (a measure based on waist and height) heightened psoriasis risk by a hefty ~7%.(1)
We were surprised by how strong the link was between belly fat and psoriasis, especially in women. This suggests there may be other biological reasons behind the connection that we still don’t fully understand.Dr. Ravi Ramessur, Lead Researcher, St John’s Institute of Dermatology, King’s College London
What You Can Do Today
Track your waist: Grab a tape measure! A waist over 35" for women, 40" for men, is linked to higher visceral fat.
Move with purpose: Aim for a mix of cardio and strength training. Resistance workouts help build muscle that burns belly fat even at rest.
Nourish to flourish: Go anti-inflammatory: think fruits, veggies, fatty fish, whole grains. Cut back on processed and sugary foods.
Explore medical support: Ask your doctor about newer weight-loss tools like GLP‑1 receptor agonists (Ozempic, Wegovy). They’ve shown promise in reducing both weight and potentially psoriasis severity.
Partner with your dermatologist: When appraising psoriasis risk, consider waist circumference and obesity, not just family history.
Bottom Line
Belly fat isn't just about vanity, it’s a potent player in provoking autoimmune conditions like psoriasis. Understanding this link empowers you to take smarter action: from monitoring your waist to adopting healthier habits and seeking targeted medical support. A slimmer, firmer core may just mean calmer, clearer skin.
References:
Ravi Ramessur, “Investigating the Genetic Basis of the Influence of Adiposity on Psoriasis: A Cross-Sectional Study in a Large United Kingdom Population–Based Biobank,” Journal of Investigative Dermatology, May 27, 2025, 10.1016/j.jid.2025.03.024
(Rh/Dr. Hansini Bhaskaran/MSM/SE)