Maria Katrina Paras

Inflammation and Neurodegenerative Disease: What's the Connection?

Article (news)

<p>When we talk about brain health, the conversation usually turns to memory sharpness, supplements, sleep, or family history. Less often do we talk about inflammation, the body&rsquo;s natural defense system, and how it may stealthily shape what happens in the brain over time.</p><div><br></div><div><span class="fr-img-caption fr-fic fr-dib fr-rounded" style="width: 700px; display: block;"><span class="fr-img-wrap"><img src="https://od2-image-api.abs-cbn.com/prod/editorImage/17880948826071.png" style="width: 700px;" class="fr-fic fr-dib"><span class="fr-inner">Brain health is shaped by what happens in the body, including long-term inflammation.</span></span></span></div><p>Inflammation isn&rsquo;t always the enemy. At its best,<strong>&nbsp;it&rsquo;s the body doing its job: helping us recover from injury, fight infection, and respond to stress.</strong> It becomes a concern <strong>when that response doesn&rsquo;t fully switch off, leaving the body in a low-grade, ongoing state of inflammation that can affect the blood vessels, metabolism, immune system, and, as researchers are finding, the brain.</strong></p><p>Researchers have been paying closer attention to this connection. In the <strong>Atherosclerosis Risk in Communities (ARIC) Study</strong>, for example, <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC6511107/" rel="noopener noreferrer" target="_blank">midlife systemic inflammation was associated with steeper cognitive decline over 20 years</a>. Another large cohort study found that <a href="https://pubmed.ncbi.nlm.nih.gov/24991031/" rel="noopener noreferrer" target="_blank">elevated midlife IL-6 predicted cognitive decline</a>, suggesting the<strong>&nbsp;immune system may influence brain aging long before memory symptoms become obvious.</strong></p><div><br></div><div><strong>How Inflammation Affects the Brain</strong></div><p>The brain has its own immune cells called microglia. They act like a clean-up crew, clearing waste and responding to injury. But when inflammation becomes persistent, these cells can stay activated for too long. Over time, that <strong>may contribute to oxidative stress, disrupted communication between brain cells, and gradual nerve cell damage.</strong></p><p>In Alzheimer&rsquo;s disease, researchers are looking at how <a href="https://www.nature.com/articles/s41582-020-00435-y" rel="noopener noreferrer" target="_blank">long-term inflammation in the brain may affect the buildup of amyloid and tau</a>. <strong>Amyloid can form sticky plaques between brain cells</strong>, while <strong>tau can form tangles inside them&mdash;both of which can interfere with how brain cells communicate and function.&nbsp;</strong>In Parkinson&rsquo;s disease, studies are also exploring how <a href="https://www.nature.com/articles/s41582-020-0344-4" rel="noopener noreferrer" target="_blank">an overactive or unbalanced immune response may play a role in how the disease develops.</a></p><p>This does not mean inflammation alone causes Alzheimer&rsquo;s, Parkinson&rsquo;s, or other neurodegenerative diseases. These conditions are complex, shaped by age, genes, vascular health, toxins, lifestyle, sleep, and other factors. But<strong>&nbsp;inflammation appears to be a key bridge between what happens in the body and what happens in the brain.</strong></p><div><br></div><div><strong>Where It Goes Wrong</strong></div><p>Chronic inflammation can come from many familiar sources: <strong>unmanaged blood sugar, visceral fat, smoking, poor sleep, chronic stress, gum disease, sedentary routines, and diets high in ultra-processed food.</strong> These may seem like &ldquo;body&rdquo; issues, but the brain is not separate from the rest of the system. It is constantly receiving signals from the immune system, bloodstream, gut, and hormones.</p><div><br></div><div><span class="fr-img-caption fr-fic fr-dib fr-rounded" style="width: 700px; display: block;" width="700"><span class="fr-img-wrap"><img src="https://od2-image-api.abs-cbn.com/prod/editorImage/17880952860792.png" style="width: 700px;" class="fr-fic fr-dib fr-rounded" width="700"><span class="fr-inner">A bad diet contributes to inflammation, blood sugar swings, and metabolic stress that affect the brain over time.</span></span></span><strong>Sugar</strong> <strong>is another piece of the inflammation-brain health puzzle. Diets high in added sugar can affect blood sugar regulation, insulin sensitivity, and inflammation&mdash;all of which may influence how the brain learns and remembers.&nbsp;</strong>In one animal study, rats given supplemental sucrose <a href="https://pubmed.ncbi.nlm.nih.gov/18510803/" rel="noopener noreferrer" target="_blank">took significantly longer to find a hidden platform in a water maze</a>, a test often used to measure spatial memory. Put simply, the rats had a harder time remembering where the &ldquo;exit&rdquo; was. While animal studies don&#39;t translate perfectly to humans, the findings echo a larger concern: <strong>consistently high sugar intake may create metabolic stress that makes the brain less efficient over time.</strong></div><p>That is why brain care cannot be reduced to one supplement, one superfood, or one quick fix. The everyday patterns matter more. A brain <strong>exposed to years of poor sleep, unstable blood sugar, stress hormones, and inflammatory signals may become more vulnerable over time.</strong></p><div><strong><span class="fr-img-caption fr-fic fr-dib fr-rounded" style="width: 700px; display: block;"><span class="fr-img-wrap"><img src="https://od2-image-api.abs-cbn.com/prod/editorImage/17880960675243.png" style="width: 700px;" class="fr-fic fr-dib fr-rounded"><span class="fr-inner">Inflammation may play a role in neurodegenerative diseases such as Alzheimer&rsquo;s and Parkinson&rsquo;s.</span></span></span></strong>The point is not to panic over every stressful week or imperfect meal. It is to understand that <strong>inflammation is cumulative. What we repeat often becomes the environment our brain lives in.</strong></div><div><br></div><div><strong>How to Care Better for Your Brain</strong></div><p>A brain-protective lifestyle begins with the basics, done consistently.</p><p><strong>Movement is one of the most powerful places to start.</strong> Exercise supports blood flow, insulin sensitivity, mood, and immune balance. A systematic review of randomized trials found that <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC7816814/" rel="noopener noreferrer" target="_blank">physical activity may favorably affect neurotrophic and inflammatory biomarkers related to dementia</a>. This doesn&#39;t mean intense workouts every day. Brisk walking, strength training, dancing, swimming, or any movement you can sustain matters.</p><p><strong>Food matters</strong>, too, especially because <strong>inflammation and metabolic health are closely linked.</strong> A <strong>Mediterranean-style diet</strong> (rich in quality proteins, vegetables, fruit, legumes, whole grains, nuts, olive oil, and fish) has some of the strongest evidence. In a randomized clinical trial, a <a href="https://jamanetwork.com/journals/jamainternalmedicine/fullarticle/2293082" rel="noopener noreferrer" target="_blank">Mediterranean diet supplemented with olive oil or nuts was linked to better cognitive outcomes than a diet without supplements</a>.</p><div><br></div><div><span class="fr-img-caption fr-fic fr-dib fr-rounded" style="width: 700px; display: block;"><span class="fr-img-wrap"><img src="https://od2-image-api.abs-cbn.com/prod/editorImage/17880962292034.png" style="width: 700px;" class="fr-fic fr-dib"><span class="fr-inner">A Mediterranean-style diet has been linked to better support for long-term brain health.</span></span></span></div><p><strong>Sleep is another non-negotiable.</strong> During sleep, the brain carries out important repair and waste-clearing processes. One human study found that <a href="https://pubmed.ncbi.nlm.nih.gov/29632177/" rel="noopener noreferrer" target="_blank">one night of sleep deprivation increased beta-amyloid burden in brain regions linked to memory</a>, reinforcing what many of us already feel after poor sleep: the brain needs rest to function and recover well.</p><p><strong>Stress management is also vital.&nbsp;</strong>Chronic stress can keep the body in an inflammatory state, so practices that help regulate the nervous system&mdash;<strong>walking, breathwork, therapy, prayer, journaling, time in nature, or meaningful social connection</strong>&mdash;are not indulgent. They are part of maintenance.&nbsp;</p><div><br></div><div><span class="fr-img-caption fr-fic fr-dib fr-rounded" style="width: 700px; display: block;" width="700"><span class="fr-img-wrap"><img src="https://od2-image-api.abs-cbn.com/prod/editorImage/17880963321425.png" style="width: 700px;" class="fr-fic fr-dib fr-rounded" width="700"><span class="fr-inner">Regular movement supports circulation, metabolism, and immune balance, all of which matter for good brain health.</span></span></span></div><div><strong>Brain Health = Body Health</strong></div><p>The link between inflammation and neurodegenerative disease is still being studied, but the message is already useful: <strong>brain health is whole-body health.&nbsp;</strong><strong>The choices that support the heart, blood sugar, gut, sleep, and immune system also support the brain.</strong> Reducing chronic inflammation is one grounded, practical way to protect the brain over time. And perhaps that is the shift we need: to stop thinking of brain care as something we begin when memory starts to fade, and to start seeing it as something we practice daily, and much earlier than we think.</p><div><br></div><p>***<br><br><em>This month, Metro launches a new wellness series dedicated to inflammation&mdash;what it is, why it happens, how it can affect your body, and most importantly, what you can do to help prevent and manage it. Watch out for more wellness stories, expert insights, and practical tips on inflammation coming soon on </em><a href="https://Metro.Style" rel="noopener noreferrer" target="_blank"><em>Metro.Style</em></a><em>&nbsp;and across Metro&rsquo;s </em><a href="https://www.instagram.com/metrodotstyle" rel="noopener noreferrer" target="_blank"><em>social media platforms</em></a><em>.</em></p>

<p><b>The choices that support the heart, blood sugar, gut, sleep, and immune system also support the brain.</b></p>

The choices that support the heart, blood sugar, gut, sleep, and immune system also support the brain.

Inflammation and Neurodegenerative Disease: What's the Connection?

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Inflammation and Neurodegenerative Disease: What's the Connection?

Danah Gutierrez

Published August 30, 2026 09:20 PM PHT

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Updated August 30, 2026 09:28 PM PHT

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