Preventing the Early Signs of Cognitive Decline
Episode Summary
Cole Siefer hosts lead clinician Colin Renaud, PA-C, for a conversation about the early signs of cognitive decline and how to stay mentally sharp for as long as possible. Renaud explains that decline is rarely one thing. It is usually a mix of poor sleep, chronic stress, blood sugar dysregulation, hormonal decline, and brain inflammation that builds quietly for years. He makes the case that the process often starts 20 to 30 years before symptoms become obvious, which is why brain fog, slower thinking, losing words, and trouble focusing in your 30s, 40s, and 50s deserve attention rather than being written off as normal aging. The two contrast the conventional response (you are just getting older, here is a sleeping pill) with the functional medicine approach of mapping lifestyle factors against biomarkers like blood sugar, inflammation, vitamin D, B12, and sex hormones. Renaud walks through the tools the clinic uses, including nutrition changes, supplements, IV therapy, peptides for mitochondrial support, and hormone optimization, while stressing that none of it works without the patient meeting them halfway. He closes with a patient case in which treating low testosterone restored a diabetic engineer's sharpness and improved his blood sugar.
Key Topics
- 1
What cognitive decline actually is, and why it is not just an older-adult issue
- 2
How blood sugar dysregulation and insulin resistance fuel brain inflammation
- 3
Early warning signs: brain fog, slower thinking, losing words, trouble focusing
- 4
Why functional medicine refuses to write symptoms off as normal aging
- 5
Sleep and the brain's glymphatic cleaning system
- 6
Chronic stress as an overlapping driver of poor sleep and nutrition
- 7
Key biomarkers: blood sugar, inflammation, vitamin D, B12, magnesium, hormones
- 8
Mitochondrial support and peptides like MOTS-c for cellular energy
- 9
Omega-3 fatty acids (DHA and EPA) for brain cell membranes and inflammation
- 10
A patient case linking low testosterone, diabetes, and cognitive decline
Quotable Moments
“If you're physically there but you're not mentally there anymore, it doesn't really matter. So cognitive health almost comes above everything when it comes to what's important.”
“We often talk about neurocognitive change as starting 20 to 30 years earlier than it actually appears.”
“When you are in deep sleep, your brain is almost like going through the rinse cycle in the dishwasher. If you're not sleeping, then your brain is not cleaning itself.”
“It's a 50/50 relationship. We can give all of our tools, but as long as you're meeting us too in the middle. We can't give everything and you do nothing.”
“You come in with a chief concern and we have to try to Sherlock Holmes it and say, how is this all related together?”
Treatments Mentioned
FAQ
Brain Health FAQ
Yes. Colin Renaud, PA-C, explains that the processes behind decline often begin 20 to 30 years before symptoms appear. Poor sleep, chronic stress, and blood sugar problems in your 30s, 40s, and 50s can quietly affect the brain long before a condition like Alzheimer's or dementia would be diagnosed.
The episode lists brain fog, slower thinking, feeling less sharp, forgetting names and words, the tip-of-the-tongue sensation, trouble multitasking or focusing, losing your train of thought mid-sentence, and a drop in creativity or reasoning. Renaud notes that occasional tiredness is normal, but symptoms that are prolonged or progressively worsening are worth investigating.
During deep sleep the brain clears waste through the glymphatic system, which Renaud compares to a rinse cycle that washes away the day's toxins. Sleep also supports memory consolidation. Without enough deep sleep, the brain does not clean itself well, which can drive brain fog, poor focus, and inflammation over time.
Renaud describes patients being told their symptoms are just from getting older, having kids, or working too much, often paired with a sleeping pill. The functional medicine approach instead asks detailed lifestyle questions and runs biomarkers like blood sugar, inflammation, vitamin D, B12, and hormones to find the root causes behind the symptoms.
No. Renaud is clear that supplements, peptides, and IV therapy only work when the basics are addressed first. He calls it a 50/50 relationship: the clinic provides the tools, but the patient has to improve diet, sleep, and stress. Taking a supplement on top of poor lifestyle habits will not make a meaningful difference.
Renaud shares a case of a 57-year-old diabetic man whose testosterone was very low and who had significant cognitive decline. He notes a clinical correlation in the literature between low testosterone and neurocognitive decline in men. After six months on testosterone replacement, the patient's sharpness returned and his blood sugar improved enough to reduce his diabetes medications.
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Longevity & Anti-Aging
Anti-aging and longevity medicine in South Portland, ME. Hormone optimization, peptide therapy, metabolic testing, and personalized health optimization.
