What Causes Arthritis and What Makes It Worse?
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By Dr. Jeffrey Peng, MD · Published March 4, 2026 · 8 min read
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Osteoarthritis is one of the most common forms of arthritis, affecting millions of people worldwide. For decades, it was widely understood as a simple wear-and-tear condition — the gradual breakdown of cartilage that cushions the ends of bones in a joint. But recent research has fundamentally changed that view. We now know that osteoarthritis is a complex, multifactorial disease driven in large part by metabolic health, systemic inflammation, and lifestyle factors — many of which are modifiable.
In my practice as a sports medicine physician, I see patients every day whose arthritis is being worsened by factors they may not even be aware of. Understanding these causes is the first step toward taking control of your joint health.
What Happens Inside a Joint with Osteoarthritis?
The ends of your bones are covered with a protective layer called articular cartilage. This cartilage acts as a cushion, allowing your joints to move smoothly and absorbing the shock from movements like walking, running, or lifting. In osteoarthritis, this cartilage gradually breaks down. As it thins, the bones can begin to rub against each other, causing pain, stiffness, swelling, and reduced range of motion. Over time, this can make everyday activities like climbing stairs or opening a jar significantly more difficult.
A 2021 narrative review in Osteoarthritis and Cartilage outlined how obesity increases osteoarthritis risk not only through biomechanical loading but also by altering metabolism and inflammation at the cellular level (Batushansky et al., 2021). This research helped establish the concept of a "metabolic" osteoarthritis phenotype — one driven by systemic metabolic dysfunction rather than mechanical wear alone.
What Is Metabolic Syndrome and How Does It Affect Arthritis?
Metabolic syndrome refers to a cluster of interrelated metabolic abnormalities, including abdominal obesity, high blood pressure, elevated blood sugar, high triglycerides, and low HDL cholesterol. Having metabolic syndrome significantly increases the risk of developing type 2 diabetes, cardiovascular disease, kidney disease, and fatty liver disease.
Clinical research has now established a clear association between metabolic syndrome and osteoarthritis. A 2023 study published in Osteoarthritis and Cartilage found that women with higher metabolic syndrome severity at baseline showed worse progression of bone spurs, bone marrow lesions, and cartilage defects on MRI over a five-year follow-up period (Jansen et al., 2023). These findings indicate that metabolic dysfunction is independently associated with structural worsening of knee osteoarthritis.
How Does Obesity Cause and Worsen Arthritis?
The most obvious mechanism is extra mechanical stress. For every pound of body weight, the knee joint experiences approximately three to four times that load during walking. An individual who is 20 pounds overweight effectively subjects their knees to an additional 60 to 80 pounds of compressive force with every step. Over time, this accelerated loading can fast-track cartilage breakdown.
However, the mechanical explanation alone does not account for a critical observation: obese individuals also develop osteoarthritis at higher rates in non-weight-bearing joints such as the hands and wrists. This is because obesity is associated with chronic, low-grade systemic inflammation. Fat tissue — particularly visceral adipose tissue — is metabolically active and releases molecules called adipokines, which circulate throughout the body and promote inflammation. This inflammation can directly damage joint cartilage and impair the function of chondrocytes, the cells responsible for maintaining and repairing cartilage.
The result is a vicious cycle: inflammation contributes to metabolic dysregulation, and metabolic dysregulation amplifies inflammation. This is one of the key mechanisms by which obesity drives progressively worsening arthritis over time.
Do Blood Sugar Levels and Diabetes Affect Arthritis?
High sugar consumption promotes the production of pro-inflammatory cytokines, which can worsen arthritis symptoms. The effects of blood glucose on joint health have been studied directly.
A cohort study published in Arthritis Research & Therapy examined the longitudinal relationship between fasting blood glucose and knee symptoms in patients with radiographic knee osteoarthritis. Higher blood glucose levels at baseline were associated with significantly worse knee pain, daily function, and sports-related outcomes over a one-year follow-up period (Chiba et al., 2022).
A systematic review and meta-analysis in the Journal of Diabetes and Its Complications further confirmed that type 2 diabetes is independently associated with the development and worsening of osteoarthritis, even after controlling for body mass index and weight (Williams et al., 2016).
Can High Cholesterol and Triglycerides Worsen Knee Arthritis?
Hyperlipidemia — characterized by elevated triglycerides and cholesterol — is another component of metabolic syndrome that has been linked to osteoarthritis. A cross-sectional and longitudinal study from the Dongfeng-Tongji cohort in China found that people with higher levels of blood lipids had significantly elevated risks of knee pain and clinical knee osteoarthritis. Each one-unit increase in triglycerides was associated with a 9% increase in the prevalence of clinical knee osteoarthritis and a 5% increase in new-onset disease (Zhou et al., 2017).
These findings support the broader hypothesis that systemic inflammation — made worse by obesity, elevated blood sugar, and dyslipidemia — contributes significantly to both the onset and progression of osteoarthritis.
Does Weight Loss Improve Arthritis Symptoms?
The evidence is clear: weight loss can meaningfully improve arthritis outcomes.
A study published in Annals of the Rheumatic Diseases followed obese patients with knee osteoarthritis who underwent bariatric surgery. Following substantial weight loss, participants experienced significant reductions in the inflammatory markers C-reactive protein and interleukin-6. Weight loss also resulted in increased biomarkers of cartilage synthesis and decreased biomarkers of cartilage degradation — both positive indicators of improved cartilage health (Richette et al., 2011).
A systematic review and meta-analysis in Obesity Reviews found that even a modest 5% weight loss produced small but significant improvements in pain, self-reported disability, and quality of life in adults with obesity and knee osteoarthritis. A 10% weight loss resulted in moderate-to-large improvements across the same outcome measures (Chu et al., 2018).
What Should You Eat to Manage Arthritis?
Dietary changes can make a significant difference in managing arthritis symptoms. In my practice, I recommend minimizing processed and fried foods, which have been associated with triggering inflammation. Reducing sugary foods and high-glycemic-index carbohydrates is also important, as these can stimulate the production of pro-inflammatory cytokines. Processed meats have similarly been correlated with increased inflammation and can further aggravate arthritis symptoms.
Instead, focus on an anti-inflammatory dietary pattern. Fill your plate with a variety of fruits and vegetables — including berries, citrus fruits, leafy greens, and cruciferous vegetables like broccoli, cauliflower, and cabbage — which are rich in antioxidants, vitamins, and minerals that help combat inflammation. Whole grains such as brown rice, quinoa, and oats provide fiber and essential nutrients while reducing inflammatory burden. Choose lean protein sources like chicken, fish, nuts, seeds, and legumes. Healthy fats from avocados, olive oil, and fatty fish like salmon contain omega-3 fatty acids with well-documented anti-inflammatory properties.
Is Exercise as Effective as Medication for Arthritis Pain?
A landmark network meta-analysis published in the British Journal of Sports Medicine compared exercise therapy with common oral pain medications — including acetaminophen, ibuprofen, and naproxen — for knee and hip osteoarthritis. The results were striking: exercise produced similar effects on pain and functional improvement as these medications, with no difference found at 4, 8, or 24 weeks. Given its excellent safety profile, the authors concluded that exercise should be given greater prominence in clinical care (Weng et al., 2023).
Exercise for arthritis management falls into two categories. The first is aerobic exercise, such as daily walking, cycling, swimming, elliptical training, or rowing. Walking specifically has been shown to prevent arthritis from worsening and is associated with better outcomes. Aim for at least 30 minutes of aerobic activity every day.
The second category is strength training. Targeting the muscles of the entire lower extremity — particularly those around the knee — has been shown to significantly reduce pain and improve function in patients with symptomatic knee osteoarthritis. Conversely, an updated systematic review and meta-analysis found that weaker knee extensor muscles are a risk factor for developing knee osteoarthritis and are linked to worse radiographic progression of the disease (Øiestad et al., 2022). Aim for strength training approximately three times per week.
Taking Control of Your Joint Health
Osteoarthritis is not solely a result of wear and tear — it is a complex interplay of metabolic factors, systemic inflammation, and lifestyle choices. By addressing your metabolic health, maintaining a healthy weight, following an anti-inflammatory diet, and committing to regular exercise, you can meaningfully slow the progression of arthritis and improve your quality of life. If you are experiencing joint pain and would like a personalized evaluation, I encourage you to schedule a consultation.
References
1. Batushansky A, Zhu S, Komaravolu RK, South S, Mehta-D'souza P, Griffin TM. Fundamentals of OA. An initiative of Osteoarthritis and Cartilage. Obesity and metabolic factors in OA. Osteoarthritis Cartilage. 2022;30(4):501-515. doi:10.1016/j.joca.2021.06.013
2. Jansen NEJ, Molendijk E, Schiphof D, van Meurs JBJ, Oei EHG, van Middelkoop M, Bierma-Zeinstra SMA. Metabolic syndrome and the progression of knee osteoarthritis on MRI. Osteoarthritis Cartilage. 2023;31(5):647-655. doi:10.1016/j.joca.2023.02.003
3. Chiba D, Ohyama T, Sasaki E, Daimon M, Nakaji S, Ishibashi Y. Higher fasting blood glucose worsens knee symptoms in patients with radiographic knee osteoarthritis and comorbid central sensitization: an Iwaki cohort study. Arthritis Res Ther. 2022;24(1):269. doi:10.1186/s13075-022-02951-2
4. Williams MF, London DA, Husni EM, Navaneethan S, Kashyap SR. Type 2 diabetes and osteoarthritis: a systematic review and meta-analysis. J Diabetes Complications. 2016;30(5):944-950. doi:10.1016/j.jdiacomp.2016.02.016
5. Zhou M, Guo Y, Wang D, et al. The cross-sectional and longitudinal effect of hyperlipidemia on knee osteoarthritis: Results from the Dongfeng-Tongji cohort in China. Sci Rep. 2017;7(1):9739. doi:10.1038/s41598-017-10158-8
6. Richette P, Poitou C, Garnero P, et al. Benefits of massive weight loss on symptoms, systemic inflammation and cartilage turnover in obese patients with knee osteoarthritis. Ann Rheum Dis. 2011;70(1):139-144. doi:10.1136/ard.2010.134015
7. Chu IJH, Lim AYT, Ng CLW. Effects of meaningful weight loss beyond symptomatic relief in adults with knee osteoarthritis and obesity: a systematic review and meta-analysis. Obes Rev. 2018;19(11):1597-1607. doi:10.1111/obr.12726
8. Weng Q, Goh SL, Wu J, et al. Comparative efficacy of exercise therapy and oral non-steroidal anti-inflammatory drugs and paracetamol for knee or hip osteoarthritis: a network meta-analysis of randomised controlled trials. Br J Sports Med. 2023;57(15):990-996. doi:10.1136/bjsports-2022-105898
9. Øiestad BE, Juhl CB, Culvenor AG, Berg B, Thorlund JB. Knee extensor muscle weakness is a risk factor for the development of knee osteoarthritis: an updated systematic review and meta-analysis including 46,819 men and women. Br J Sports Med. 2022;56(6):349-355. doi:10.1136/bjsports-2021-104861
Medical Disclaimer: This content is for educational purposes only and does not substitute for the medical advice of a physician. Always consult your healthcare provider before beginning any new treatment program. The information presented reflects the opinion of Dr. Jeffrey Peng and does not represent the views of his employers or affiliated hospital systems.
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