'Obesity and Cognitive Problems'

 Understanding the multifaceted relationship between obesity and cognitive function is vital for advancing patient care. Research shows that excess body weight can affect mental sharpness and increase the risk of neurocognitive disorders, highlighting the importance of comprehensive clinical care.

There is an elevated risk of cognitive decline with known metabolic diseases including obesity, said Jessica Zwerling, MD, MS, a neurologist with a specialty in geriatric neurology and neuromuscular disease; director, Montefiore Einstein Center for the Aging Brain; and professor of neurology and psychiatry, Albert Einstein College of Medicine, Bronx, New York. “Vascular risk can impact cognitive function; risk factors like diabetes, hypertension, and hyperlipidemia are significantly increased with obesity almost 2-3-fold,” she said. 

Zwerling called for particular attention to these medical issues:

Obesity may impact sugar markers. At the cellular level, when obesity is present, three factors can drive an inflammatory cascade: cytokines, oxidative stress, and free radicals, she said. “Additionally, obesity-related inflammation can cause impaired insulin secretion leading to elevated sugars in the blood and can drive the accumulation of amyloid in the brain,” she said.

Obesity can affect gut-brain access. This pathway connects the digestive system and central nervous system, which sends information both ways. 

“Obesity causes structural changes in the microbiome particularly with higher levels of polyunsaturated fatty acids, which can induce inflammatory changes,” Zwerling said. “This inflammation and insulin resistance and pro-inflammatory mediators can cross the blood-brain barrier to damage the hippocampus, which is our ‘storage chip’ for memories.”

Daily Functioning and Performance

Obesity affects daily life and is linked to cognitive function. 

“Decreased physical activity related to obesity can lead to social isolation, poor sleep, and impairment in the activities of daily living,” Zwerling said. “Activity might be limited due to habitus as central obesity can lead to pulmonary dysfunction due to changes in mechanics of the lungs.” 

Furthermore, obesity serves as an independent risk factor for sleep apnea, which is closely associated with cognitive function and overall quality of life, she said. 

Zwerling emphasized the need to address obesity and cognitive conditions in discussions. 

“We want PCPs to share how obesity can address mental health and cognitive health issues. Some may just think physical implications. We want to bring to light that they understand issues like brain fog, lack of concentration, poor mental acuity, and other brain-centric concerns can be attributed to obesity,” she said.

Once discussions take place, short-term actions can be helpful, emphasizing that lifestyle shifts in nutrition, exercise, sleep, and stress management can support patient change, she said.

Badr Ratnakaran, MD, associate professor and geriatric psychiatrist, Penn State Health/Pennsylvania Psychiatric Institute, Harrisburg, Pennsylvania, told Medscape Medical News that apart from cognitive issues, obesity is associated with psychological issues like negative self-image from stigma related to obesity, loneliness, depression, anxiety and excessive alcohol use, which can affect daily functioning. 

Obesity can impact mental and cognitive health. “Some may just think physical implications. We want to bring to light that they understand issues like brain fog, lack of concentration, poor mental acuity, and other brain-centric concerns can be attributed to obesity,” said Ratnakaran, who also serves as chair of APA Council on Geriatric Psychiatry.

Treating obesity should focus on lasting improvements in self-image, mental, physical, and cognitive health, not just its causes, he said. 

Ratnakaran compiled these mechanisms for case management. 

• Encouraging a patient to be physically, mentally, and socially active to prevent cognitive decline.
• Managing vascular risk factors including elevated blood pressure, elevated blood sugar, lipid abnormalities in blood, and reducing or quitting smoking, alcohol, and other recreational drugs.
• Explaining how a long-term goal will be targeting a gradual weight reduction to a desired level and maintaining it.

What About Suggesting a GLP-1?

GLP-1s improve blood sugar control, lowering the vascular risk for dementia in type 2 diabetes. Their use also promotes weight loss, which can reduce other obesity-related risks. However, regarding cognitive decline, some studies cite further conclusive clinical evidence is needed. 

Zwerling has received grant funding from the National Institutes of Health (NIH) as well as the New York State Department of Health. 

Ratnakaran reported no financial disclosures.

https://www.medscape.com/viewarticle/obesity-and-cognitive-problems-understanding-connection-2026a1000pfm