When Anxiety, Depression, and Brain Changes Show Up Together
By Dr. Cynthia Libert, Functional Medicine Physician | Caring for the Body, Center for Functional Medicine
Have you ever had that moment where you stop and think, "Something about my brain just doesn't feel the same anymore"?
Not traumatic. Not catastrophic. Just off. Maybe your memory isn't as sharp, or your focus feels a little fuzzy. And alongside that, there may be anxiety that wasn't there before — or a heaviness, a low-grade sadness that's hard to put into words.
If that's you, I want to start by saying: you are not alone, and you are not imagining this.
The Body Was Never Meant to Be Fragmented
Our medical system has done extraordinary things. But it tends to separate what was designed to work together — mind and body, symptoms and causes. And when we lose that integration, people often feel unseen and unheard.
We were designed as whole beings: body, mind, soul, and spirit, woven together in a way that's far more intricate than we often appreciate. The brain and the body are not working independently. They respond to one another, and they respond to the environment we live in. When one system is under strain, the other systems feel it.
One of the greatest misunderstandings in modern medicine is that symptoms are the enemy — something to suppress, quiet, or override. But symptoms are communication. They're feedback. They're the body's way of saying something needs attention here.
Why These Symptoms Often Appear Together
We've created artificial boundaries in medicine that don't exist in real life. We talk about mental health as if it lives in one silo and brain health as if it lives in another. But the same brain tissue that regulates mood and emotional resilience is the same tissue responsible for memory, focus, word-finding, planning, and executive function.
So when anxiety and depression show up alongside cognitive changes, the question isn't which one came first. The more useful question is: what's happening underneath that could be affecting all of this at once?
Common Root Causes Worth Exploring
This is where functional medicine changes everything — not by abandoning conventional care, but by asking different questions. Instead of simply naming what a patient has, we ask why this is happening, to this person, at this time, with their unique story.
When we take time to ask those deeper questions, patterns start to emerge. Here are some of the most common biological root causes I see contributing to anxiety, depression, and cognitive changes:
Neuroinflammation. The brain is exquisitely sensitive to inflammatory signals. Chronic low-grade inflammation can alter neurotransmitter function, impair neuroplasticity, and disrupt the blood-brain barrier — all of which can interfere with memory and mood. Inflammation can come from many sources: poor sleep, chronic stress, insulin resistance, autoimmunity, gut permeability, and environmental exposures.
Infectious burden. Tick-borne illnesses and Lyme disease can cause profound cognitive and psychiatric symptoms, sometimes years after initial exposure. These are often missed because standard testing is limited, and patients are told it's "just anxiety" without anyone asking whether there might be an infectious driver underneath.
Toxic load. Mold and mycotoxins from water-damaged buildings are seriously underrecognized contributors to brain-based symptoms. Environmental chemicals — pesticides, heavy metals, plastics — accumulate in fatty tissues, including the brain. I frequently see patients who declined cognitively or emotionally after a move, a renovation, or a water leak.
Metabolic dysfunction. The brain is one of the most metabolically active organs in the body. When blood sugar is unstable or insulin signaling is impaired, the brain suffers — showing up as anxiety, poor concentration, memory lapses, and over time, cognitive decline. Some researchers now refer to Alzheimer's disease as "type 3 diabetes." Addressing metabolic health is not optional for brain health.
Hormonal changes. Declining estrogen, testosterone, dysregulated cortisol, and reduced growth hormone support can impair memory and resilience. These changes often happen during midlife, and many people are told it's just aging — when there's a hormonal component that deserves attention.
Vascular health. High blood pressure, high cholesterol, and a sedentary lifestyle affect the tiny blood vessels that deliver oxygen and nutrients to the brain. These changes can happen decades before cognitive decline becomes visible.
Trauma. Both physical and psychological. Even mild concussions can play a role in cognitive and mood changes. Emotional trauma can put the body in a state of hypervigilance that affects the nervous system in a profound way.
Faith Is Not Separate From This
We can name all of these categories. We can address many of them through lifestyle, targeted nutrition, movement, sleep restoration, stress regulation, community — even medications and supplements where appropriate.
But only God sees the full picture. Only He knows all the layers of these root causes. And of course, only God ultimately heals.
Faith and medicine are not separate. Faith is the foundation.
I believe true flourishing comes not just from attending to our biology, but from living in right relationship with God, with ourselves, and with others. Spiritual practices — prayer, scripture, Sabbath rest, gratitude, forgiveness — are not extras. Over time, they actually shape our nervous system and our capacity to experience the peace and healing available to us.
Faith also means stewardship. It means tending to these bodies we've been gifted with. Nourishing them, resting them, moving them, engaging in meaningful work and loving relationships — and seeking wise counsel when something feels off.
Please Don't Settle for Dismissal
If anxiety, depression, and cognitive changes are showing up together in your life — or in the life of someone you love — please don't accept that it's "just stress" or "just aging" without a thoughtful evaluation.
These symptoms are important signals. They invite exploration and understanding. And when we understand the root causes, it opens the door to take wise action.
Ready to take a root-cause approach to your health? Start with a free strategy session with the Caring for the Body team.
Whole-person care. Science-backed. Faith-informed.
This post is adapted from the Re-Think Aging YouTube channel. Watch the full episode here: https://www.youtube.com/watch?v=cswVhL8g0Co