Dr. Gil Mejia

02/21/2026

Carbs don’t directly “build” muscle — training does.

Yes, muscle growth ultimately comes down to total calories and adequate protein. That’s well established, and even research discussed by Menno Henselmans supports that carbohydrates themselves don’t independently increase muscle hypertrophy.

But here’s what matters:

Carbohydrates influence the performance environment.

They affect:
• Training intensity
• Volume capacity
• Recovery speed
• Glycogen replenishment
• Hormonal response to hard training

And those are the true drivers of hypertrophy.

Train harder → create greater mechanical tension → generate stronger adaptive signaling → grow more muscle.

Carbs can support that process.

However…

If you’re not training with real intensity or progressive overload, excess carbohydrates don’t magically convert into muscle tissue.

They elevate insulin, refill glycogen beyond demand, and when energy intake exceeds expenditure, the surplus gets stored — preferentially as fat.

And not just subcutaneous fat.

Chronically excessive carbohydrate intake in the absence of sufficient muscular demand can promote visceral adiposity — the metabolically active fat surrounding your organs.

Visceral fat is strongly associated with:
• Insulin resistance
• Metabolic dysfunction
• Chronic low-grade inflammation
• Elevated triglycerides
• Increased cardiovascular risk

In other words:
Carbs are performance fuel — not passive muscle builders.

If you train hard, they’re a tool.
If you don’t, they become a liability.

Fuel the stimulus.
Earn your carbohydrates.

02/19/2026

New research shows that WHEN you eat may matter just as much as WHAT you eat.

A 2026 meta-analysis of randomized trials found that time-restricted eating improves metabolic health — but the biggest benefits happen when meals are earlier in the day, not late at night.

Key findings:
• Time-restricted eating improves weight, blood sugar, and cardiovascular markers vs. usual diets.
• Eating earlier or mid-day leads to better metabolic outcomes than eating late.
• Shorter eating windows alone aren’t always better — timing matters more.
• Our metabolism follows circadian rhythms and processes food more efficiently earlier in the day.

The takeaway:
It’s not just how long you fast — it’s when you eat.
Aligning meals earlier in the day may help optimize weight, blood sugar, and long-term metabolic health.

02/14/2026

Longevity tip of the day: diet matters, sleep matters… but saying the wrong thing matters most. lol

02/13/2026

Do you… your kids… or your grandkids love candy? 🍬

Then this matters.

Recent testing from Florida’s Healthy Florida First initiative found arsenic in dozens of popular candy products — including items widely consumed by children.

In fact:
• 46 candy products were tested
• 28 contained elevated arsenic levels
• The concern is greatest for kids due to repeated exposure over time

Arsenic is not something you want in a child’s daily routine.
Long-term exposure has been linked to cancer and other health risks.

This doesn’t mean panic.
It means awareness.

Before the next candy purchase — take a look at the list and make informed choices for your family.

👉 https://exposingfoodtoxins.com/candy/

Because what seems like a harmless treat…
should never come with hidden toxins.

Protect the brain.
Protect the body.
Protect the next generation.

02/13/2026

A major new study published in JAMA followed more than 130,000 people for decades — and the findings are hard to ignore.

Regular intake of caffeinated coffee and tea was linked to:
• Lower risk of dementia
• Better cognitive performance
• Reduced subjective cognitive decline

Here’s the key insight:
It wasn’t decaf.

The protective association was seen specifically with caffeinated coffee and tea, with the strongest benefit around:
☕ 2–3 cups of coffee/day
🍵 1–2 cups of tea/day

This wasn’t a small or short study — it tracked participants for up to 40+ years and documented over 11,000 dementia cases.

The takeaway:
Caffeine isn’t just about energy. It may play a meaningful role in long-term brain health and resilience.

Your daily cup could be doing more than waking you up… it may be helping protect your brain.

02/11/2026

Women need testosterone too!
In fact, over the past 20 years, nearly 70% of our patients on testosterone therapy have been women.

Why?
Because testosterone is the most abundant biologically active hormone in a woman’s body — even more than estrogen.

It plays a critical role in:
• Energy
• Libido
• Mood and confidence
• Muscle tone
• Brain function
• Master Metabolism

This is why hormone optimization for women must go beyond estrogen replacement.

02/07/2026

Before you take your next bite of bread… you may want to check if it’s contaminated with glyphosate — the same chemical used as a w**d killer.

02/06/2026

In my practice, homocysteine is a core brain and heart health biomarker. If you haven’t checked it, you’re missing a critical piece of your longevity profile.

Why Elevated Homocysteine Is So Damaging to the Brain

Homocysteine is a sulphur-containing amino acid produced during normal protein metabolism. Under healthy conditions, it is quickly recycled through methylation or converted into cysteine using B-vitamins such as folate, vitamin B12, and vitamin B6.

When this process breaks down, homocysteine accumulates in the blood - and that’s where the trouble begins.

Over the past three decades, elevated homocysteine has been consistently linked to cognitive decline, stroke, dementia, epilepsy, depression, and neurodevelopmental disorders. Importantly, its effects on the brain are not subtle.

Homocysteine Is Directly Neurotoxic

High homocysteine levels are toxic to neurons. One of the primary mechanisms is overstimulation of NMDA (N-methyl-D-aspartate) glutamate receptors, which leads to excitotoxicity - a process where neurons are damaged or killed due to excessive stimulation.

This mechanism has been demonstrated repeatedly in both animal and human studies and is particularly relevant in conditions such as epilepsy, neurodegeneration, and brain injury.

Neurons exposed to high homocysteine show increased calcium influx, mitochondrial dysfunction, and ultimately cell death.

It Drives Oxidative Stress in Brain Tissue

The brain is highly metabolically active and especially vulnerable to oxidative damage. Elevated homocysteine increases the production of reactive oxygen species (ROS) while simultaneously reducing antioxidant capacity, including glutathione availability.

Oxidative stress damages neuronal membranes, proteins, and DNA. Over time, this contributes to accelerated brain aging, impaired cognition, and increased vulnerability to neurodegenerative disease.

This oxidative burden is one reason homocysteine is associated with both Alzheimer’s disease and vascular dementia.

It Damages Blood Vessels and the Blood–Brain Barrier

Homocysteine is toxic to endothelial cells - the cells that line blood vessels. Elevated levels impair nitric oxide signaling, increase arterial stiffness, and promote microvascular damage.

In the brain, this translates to:
• Reduced cerebral blood flow
• Impaired oxygen and nutrient delivery
• Breakdown of the blood–brain barrier

Once the blood–brain barrier is compromised, inflammatory molecules and toxins can enter brain tissue more easily, further accelerating neurological damage.

This vascular mechanism explains why homocysteine is a strong independent risk factor for stroke and white-matter lesions.

Chronic Neuroinflammation Is a Key Outcome

Elevated homocysteine activates microglia - the brain’s immune cells. While short-term activation is protective, chronic activation leads to sustained neuroinflammation.

Long-term neuroinflammation has been implicated in:
• Cognitive decline
• Mood disorders
• Autism spectrum disorders
• Parkinson’s and Alzheimer’s disease

Unlike acute injury, this inflammatory process often progresses silently for years before symptoms become obvious.

Homocysteine Disrupts Methylation in the Brain

Perhaps most importantly, elevated homocysteine is a marker of impaired methylation.

Methylation is essential for:
• Neurotransmitter synthesis (dopamine, serotonin, noradrenaline)
• Myelin maintenance and nerve signaling
• DNA repair and gene regulation

When methylation falters, the brain becomes less adaptable, less resilient, and more prone to dysfunction under stress. This helps explain the strong association between high homocysteine and conditions such as ADHD, depression, anxiety, and seizures.

Why This Often Goes Undetected

Despite the evidence, homocysteine is still not routinely tested in neurological or psychiatric settings. Standard blood panels often overlook it, and symptoms are frequently attributed to stress, aging, or idiopathic causes.

Yet homocysteine is one of the few modifiable risk factors for brain health that is inexpensive to test and, in many cases, reversible with targeted nutritional intervention.

Final Thoughts

Elevated homocysteine does not cause one single neurological disease. Instead, it weakens the brain’s defenses across multiple systems - vascular, metabolic, inflammatory, and genetic.

Left unaddressed, it quietly accelerates neurological decline. Addressed early, it represents a powerful opportunity for prevention.

References

1. Smith AD, Refsum H.
Homocysteine, B vitamins, and cognitive impairment.
Annual Review of Nutrition. 2016;36:211–239.
DOI: 10.1146/annurev-nutr-071715-050947

2. Lipton SA, Kim WK, Choi YB, et al.
Neurotoxicity associated with dual actions of homocysteine at the NMDA receptor.
Proceedings of the National Academy of Sciences (PNAS). 1997;94(11):5923–5928.
DOI: 10.1073/pnas.94.11.5923

3. Ho PI, Ortiz D, Rogers E, Shea TB.
Homocysteine potentiates β-amyloid neurotoxicity: role of oxidative stress.
Journal of Neurochemistry. 2001;78(2):249–253.
DOI: 10.1046/j.1471-4159.2001.00384.x

4. Seshadri S, Beiser A, Selhub J, et al.
Plasma homocysteine as a risk factor for dementia and Alzheimer’s disease.
New England Journal of Medicine. 2002;346(7):476–483.
DOI: 10.1056/NEJMoa011613

5. Obeid R, Herrmann W.
Mechanisms of homocysteine neurotoxicity in neurodegenerative diseases with special reference to dementia.
FEBS Letters. 2006;580(13):2994–3005.
DOI: 10.1016/j.febslet.2006.04.088

6. Ansari R, Mahta A, Mallack E, Luo JJ.
Hyperhomocysteinemia and neurologic disorders: a review.
Journal of Clinical Neurology. 2014;10(4):281–288.
DOI: 10.3988/jcn.2014.10.4.281

7. Ono H, Sakamoto A, Eguchi T, et al.
Plasma total homocysteine concentrations in epileptic patients taking anticonvulsant drugs.
Epilepsia. 1997;38(8):832–836.
DOI: 10.1111/j.1528-1157.1997.tb01467.x

02/06/2026

Bread is a daily staple for many families — but what’s actually in it?

Recent independent testing released through Florida’s Healthy Florida First initiative analyzed commonly sold bread products found in grocery stores. The findings showed that glyphosate (a common w**d-killing chemical) was detected in 6 out of 8 breads tested, with some showing significantly higher levels than others. https://exposingfoodtoxins.com/bread/

01/22/2026

🩺 A quick nutrition myth I addressed with a patient recently…

I have a patient who started a carnivore-style diet and was losing weight successfully.
Her primary care doctor advised her to stop because of a history of elevated cholesterol.

Here’s the important clarification 👇

🥩 Carnivore does NOT mean “all red meat.”

In my practice, carnivore is about animal-based nutrition, not unlimited steak.

My rule of thumb:
✔️ 40% poultry
✔️ 40% fish & seafood
✔️ 20% red meat

And yes — it can be done with zero red meat if needed.

For patients with cholesterol concerns, I often emphasize:
🐟 fatty fish
🍗 poultry
🥚 eggs
🦐 seafood

Nutrition is not one-size-fits-all.
It must be personalized, strategic, and medically guided — especially when cholesterol, insulin resistance, or inflammation are involved.

Weight loss, metabolic health, and heart health can coexist when nutrition is done correctly.

— Dr. Mejia

01/16/2026

I’m attending the A4M Cognition 360 Conference, where the future of brain health is being built. This is where cutting-edge neuroscience meets longevity—so your mind stays sharp, resilient, and powerful for years to come.

01/10/2026

This is Essential Health Knowledge.
Below is the classification system that breaks foods down from minimally processed to processed and ultra-processed.
This matters—because what you eat directly impacts inflammation, metabolism, and long-term health.
Understanding this difference can literally change your health trajectory.
Memorize it. Apply it.
And pass it on to the people you care about.