A groundbreaking study shows Alzheimer’s can be reversed in mice by restoring the brain’s energy balance. Here’s how diet, exercise, and sleep might offer a non-pharmaceutical path to the same goal.
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Introduction
For more than a century, an Alzheimer’s disease diagnosis has carried an implicit guarantee: what you lose, you will never get back. The memory of a grandchild’s name, the route back home from the grocery store, the ability to hold a conversation—all of it, patients and families have been told, is on a one-way slide toward irreversible decline.
But what if that long-held assumption is wrong?
What if the brain, even after sustaining significant damage, retains a hidden capacity to heal itself?
A stunning new study published in December 2025 in the journal Cell Reports Medicine suggests exactly that. Researchers from University Hospitals, Case Western Reserve University, and the Louis Stokes Cleveland VA Medical Center have demonstrated for the first time that advanced Alzheimer’s disease can be reversed—at least in mice.
The key, they discovered, lies not in attacking the infamous amyloid plaques or tau tangles directly, but in restoring the brain’s fundamental energy supply.
This discovery opens a radical new frontier in Alzheimer’s research. And while the study used a pharmaceutical compound to achieve its remarkable results, the underlying mechanism points directly to something every reader can influence starting today: the lifestyle choices that keep our cellular batteries charged.
The Cellular Battery That Powers Brain Health
To understand this breakthrough, we need to understand a molecule you’ve probably never heard of: NAD+, or nicotinamide adenine dinucleotide.
Think of NAD+ as the rechargeable battery inside every one of your brain cells. It’s not a fuel itself, but it’s essential for converting the food you eat into the energy your cells need to function. NAD+ powers the enzymes that repair damaged DNA. It activates proteins called sirtuins that protect cells from stress and aging. It supports the mitochondria—the tiny power plants inside cells—that keep neurons firing and communicating.
In short, without adequate NAD+, your brain cells can’t maintain themselves, can’t repair damage, and eventually can’t survive.
“We’ve known for years that NAD+ levels decline naturally as we age,” explains Dr. Andrew Pieper, senior author of the study and Director of the Brain Health Medicines Center at the Harrington Discovery Institute at University Hospitals. “But what we found in Alzheimer’s disease is something far more dramatic.”
Examining brain tissue from both human Alzheimer’s patients and multiple mouse models of the disease, the research team discovered that NAD+ levels weren’t just slightly lower—they were plummeting.
Advanced 5xFAD mice, a standard model of Alzheimer’s, showed a 45 percent reduction in brain NAD+ compared to healthy mice. Human Alzheimer’s brain tissue showed a 30 percent reduction, and the severity of the depletion correlated directly with the severity of the disease.
This wasn’t just a correlation. It was a potential cause.
A Bold Experiment: Can Advanced Disease Be Reversed?
The research team, led by Dr. Kalyani Chaubey, designed an audacious experiment. Instead of asking whether maintaining NAD+ levels could prevent Alzheimer’s—a question that’s been explored before—they asked whether restoring NAD+ balance after the disease was already advanced could reverse it.
They used two different mouse models. One carried multiple human mutations affecting amyloid processing; the other carried a mutation in the tau protein. Both developed the full spectrum of Alzheimer ‘s-like damage: breakdown of the blood-brain barrier, chronic neuroinflammation, oxidative stress, DNA damage, loss of new neuron formation in the hippocampus, and severe cognitive deficits in memory and learning tests.
At six months of age—equivalent to advanced disease in these models—the researchers began treating one group with a compound called P7C3-A20, developed in the Pieper laboratory over more than a decade of research. Unlike previous approaches that simply flooded the body with NAD+ precursors, P7C3-A20 works differently: it helps cells maintain a healthy NAD+ balance during extreme stress, keeping levels within a normal physiological range rather than artificially pushing them higher.
The results, published on December 22, 2025, were nothing short of remarkable.
By twelve months of age—after six months of treatment—the mice showed complete cognitive recovery. They performed as well as healthy controls on tests of memory, learning, and motor coordination. Their brains showed normalized levels of phosphorylated tau 217, a clinical biomarker now used to diagnose Alzheimer’s in humans. The pathological damage that had accumulated—the blood-brain barrier deterioration, the neuroinflammation, the oxidative stress—had been substantially repaired.
“We were very excited and encouraged by our results,” Dr. Pieper told ScienceDaily. “Seeing this effect in two very different animal models, each driven by different genetic causes, strengthens the idea that restoring the brain’s NAD+ balance might help patients recover from Alzheimer’s.”
The study also identified 46 specific proteins that were abnormally expressed in both human Alzheimer’s brains and the diseased mouse brains—and that were normalized by the treatment. These proteins are involved in processes central to brain health: proteostasis (maintaining proper protein folding), RNA metabolism, mitochondrial function, and lipid biology. They represent potential targets for future therapies and possible biomarkers for tracking recovery.
A Critical Distinction: Why Balance Matters More Than Quantity
Before you rush to the health food store, Dr. Pieper offers a crucial warning.
The approach used in this study is fundamentally different from taking over-the-counter NAD+ precursor supplements like nicotinamide riboside (NR) or nicotinamide mononucleotide (NMN), which have become popular in recent years.
“Such supplements have been shown in animal studies to raise NAD+ to dangerously high levels that promote cancer,” Dr. Pieper cautioned in the ScienceDaily release.
This distinction is critical. NAD+ isn’t a simple “more is better” nutrient. Because it fuels fundamental cellular processes, including growth and division, pushing levels too high can potentially “fuel the tank” of dormant cancer cells or other unwanted proliferative pathways. It’s the difference between carefully regulating your home’s temperature with a thermostat versus just turning the furnace to maximum and hoping for the best.
The compound used in the study, P7C3-A20, doesn’t force NAD+ levels up. Instead, it helps cells maintain normal NAD+ balance when they’re under stress—keeping levels within the range that evolution designed our cells to use. It restores homeostasis rather than creating supraphysiological overload.
This distinction matters enormously for anyone considering NAD+-boosting strategies. The goal isn’t maximum NAD+. The goal is balanced NAD+.
The Lifestyle Connection: Can We Achieve Balance Naturally?
Here’s where this research becomes immediately relevant to every reader. The same NAD+ balance that the pharmaceutical compound restored pharmacologically can also be influenced—powerfully—by lifestyle choices.
Our bodies evolved over millions of years with built-in mechanisms for maintaining NAD+ homeostasis. These mechanisms respond to specific environmental signals: food availability, physical activity, and the natural cycle of day and night. By understanding these signals, we can potentially support our brain’s NAD+ balance without taking a single pill.
Fasting and Caloric Restriction
When you eat, your body is in “fed mode.” Growth pathways are active, and cells focus on building and storing. But when you fast—even for relatively short periods—your cells sense a state of low energy. This triggers a survival response that includes boosting NAD+ to activate sirtuins, the protective proteins that repair DNA and enhance cellular resilience.
This isn’t speculation. The study itself notes that prior research has shown NAD+ depletion in Alzheimer’s models and partial attenuation of pathology with NAD+ precursor supplementation. The mechanism linking fasting to NAD+ involves AMPK (AMP-activated protein kinase), an enzyme that acts as a cellular fuel gauge. When AMPK senses low energy, it boosts the activity of NAMPT—the rate-limiting enzyme in the primary NAD+ production pathway.
Practical approaches include intermittent fasting schedules like 16:8 (fasting for 16 hours, eating within an 8-hour window), time-restricted feeding (confining eating to a 10-12 hour period daily), or periodic longer fasts for those who can do so safely. The key is giving your cells regular periods without incoming fuel, allowing them to activate their built-in repair pathways.
High-Intensity Exercise
Physical activity, particularly intense exercise, creates a controlled energy demand that powerfully stimulates NAD+ production. When muscles contract repeatedly, they increase their demand for ATP (the energy currency that NAD+ helps produce). This metabolic stress signals the body to ramp up NAD+ synthesis to meet the demand.
High-intensity interval training (HIIT)—short bursts of intense activity followed by rest periods—appears particularly effective.
Resistance training also creates significant metabolic stress. The combination of cardiovascular and resistance exercise provides overlapping benefits for overall metabolic health, which supports healthy NAD+ metabolism.
Circadian Rhythm Optimization
Your body’s internal clock is deeply intertwined with NAD+ metabolism. The clock genes that regulate your sleep-wake cycle directly control the activity of NAMPT, the same enzyme that fasting activates. When your circadian rhythm is disrupted—through irregular sleep schedules, nighttime light exposure, or shift work—this NAD+ production cycle is thrown off balance.
The study also examined a unique group of people: those whose brains showed the physical signs of Alzheimer’s disease (like amyloid plaques) but who never developed dementia. These resilient individuals, known as NDAN or Nondemented with Alzheimer’s neuropathology, had gene activity patterns suggesting their brains successfully maintained a healthy NAD+ balance. This hints that keeping your body’s daily sleep-wake cycle, or circadian rhythm, strong might be a key part of that protection.
Practical steps include consistent sleep and wake times (even on weekends), morning exposure to bright light to set your clock, and reducing blue light exposure from screens in the hours before bed.
The Synergy Factor
These interventions don’t work in isolation. They work together. A person who fasts regularly, exercises intensely, and maintains consistent sleep is creating a powerful cumulative signal for cellular repair and resilience. Each intervention reinforces the others, potentially producing effects greater than the sum of their parts.
A New Framework for Thinking About Alzheimer’s
Perhaps the most profound implication of this research is conceptual. For decades, Alzheimer’s has been viewed primarily as a problem of protein accumulation—amyloid plaques and tau tangles that clog the brain like garbage in the streets. The logical therapeutic approach has been to remove the garbage: develop drugs that clear amyloid, prevent tau aggregation, or block their formation.
But the clinical results of this approach have been disappointing at best. Multiple high-profile drugs have failed in trials. Those that succeeded offered only a modest slowing of the decline, not a reversal of the damage. Patients and families have been left with the bitter reality that the best available treatments do not restore what has been lost.
This study suggests a different framework. Perhaps the protein accumulations are symptoms of a deeper problem: cellular energy failure. When brain cells can’t maintain their energy balance, they can’t perform the housekeeping functions that keep proteins properly folded and cleared. The plaques and tangles may be the smoke, not the fire.
“The key takeaway is a message of hope—the effects of Alzheimer’s disease may not be inevitably permanent,” Dr. Pieper said. “The damaged brain can, under some conditions, repair itself and regain function.”
This reframing has profound implications. It suggests that even brains with significant pathology might retain the capacity for recovery if the underlying energy failure can be corrected. It suggests that preserving cognitive function isn’t just about preventing protein accumulation but about maintaining the cellular machinery that keeps neurons healthy and resilient.
What This Means for You Today
Let’s be clear about what this study does and doesn’t show.
It shows that in mice genetically engineered to develop Alzheimer ‘s-like pathology, restoring NAD+ balance can reverse cognitive deficits and brain damage. That’s a monumental scientific finding—but mice aren’t humans.
Human clinical trials are the essential next step, and the technology is now being commercialized by Glengary Brain Health, a Cleveland-based company co-founded by Dr. Pieper, with the goal of moving toward patient testing.
What the study doesn’t show is that any particular lifestyle intervention can reverse human Alzheimer’s disease. That question remains unanswered and will require extensive research.
But here’s what we do know: the mechanisms this study identifies as central to Alzheimer’s—NAD+ depletion, oxidative stress, neuroinflammation, mitochondrial dysfunction—are all influenced by lifestyle.
We know that fasting activates the same NAD+ production pathways. We know that exercise improves mitochondrial function. We know that sleep is when the brain’s glymphatic system clears metabolic waste.
We also know that these interventions are safe, accessible, and have myriad other health benefits. They don’t require FDA approval. They don’t carry the risk of pushing NAD+ to cancer-promoting levels. They work with your body’s evolved regulatory systems rather than overriding them.
Conclusion: A New Message of Hope for Brain Health
This study delivers a message of hope that echoes across a century of Alzheimer’s research: the brain may not be permanently beyond repair. For the first time, scientists have shown that even advanced disease pathology can be reversed when the underlying energy failure is corrected.
The 45 percent drop in brain NAD+ seen in diseased mice—and the complete cognitive recovery achieved by restoring that balance—proves that our cells possess a latent capacity for healing we have only begun to understand. The damage is not necessarily final. The decline is not inevitably permanent.
But hope without action is merely wishful thinking. While we await clinical trials to determine whether these findings translate to humans, every person reading these words can take steps today to support their own brain energy balance.
Adopt intermittent fasting to give your cells the metabolic break they need to activate repair pathways. Commit to regular exercise that signals your body to produce more NAD+.
Protect your sleep as the non-negotiable foundation of circadian health. These choices cost nothing, carry no risk of the dangerously high NAD+ levels that concern researchers, and work with your body’s evolved regulatory systems. The science is clear: brain resilience can be built. The question is whether we will choose to build it.
The study, “Pharmacologic reversal of advanced Alzheimer’s disease in mice and identification of potential therapeutic nodes in human brain,” was published December 22, 2025, in Cell Reports Medicine. It was supported by The Valor Foundation, the Wichita Foundation, the Department of Veterans Affairs, the National Institutes of Health, and multiple other funding sources.
Don’t Get Sick!
About Dr. Jesse Santiano, MD
Dr. Santiano is a retired internist and emergency physician with extensive clinical experience in metabolic health, cardiovascular prevention, and lifestyle medicine. He reviews all medical content on this site to ensure accuracy, clarity, and safe application for readers. This article is for educational purposes and is not a substitute for personal medical care.
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Resources you can use:
HIIT
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Fasting articles:
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- Exercise Makes Fasting Easier
Featured references:
- Chaubey, K., Vázquez-Rosa, E., Tripathi, S. J., Shin, M. K., Yu, Y., Dhar, M., Chakraborty, S., Yamakawa, M., Wang, X., Sridharan, P. S., Miller, E., Bud, Z., Corella, S. G., Barker, S., Caradonna, S. G., Koh, Y., Franke, K., Cintrón-Pérez, C. J., Rose, S., Fang, H., … Pieper, A. A. (2025). Pharmacologic reversal of advanced Alzheimer’s disease in mice and identification of potential therapeutic nodes in human brain. Cell Reports Medicine, *7*(1), 102535. https://doi.org/10.1016/j.xcrm.2025.102535
- University Hospitals Cleveland Medical Center. (2025, December 24). Scientists reverse Alzheimer’s in mice and restore memory. ScienceDaily. Retrieved March 19, 2026, from www.sciencedaily.com/releases/2025/12/251224032354.htm
References on Exercise and NAD+ Balance
Cantó, C., Gerhart-Hines, Z., Feige, J. N., Lagouge, M., Noriega, L., Milne, J. C., Elliott, P. J., Puigserver, P., & Auwerx, J. (2009). AMPK regulates energy expenditure by modulating NAD+ metabolism and SIRT1 activity. Nature, *458*(7241), 1056–1060. https://doi.org/10.1038/nature07813
*This foundational study demonstrates that AMPK activation during exercise increases NAD+ levels and enhances SIRT1 activity, establishing the molecular link between physical activity and NAD+ metabolism.*
White, A. T., & Schenk, S. (2012). NAD+/NADH and skeletal muscle mitochondrial adaptations to exercise. American Journal of Physiology-Endocrinology and Metabolism, *303*(3), E308–E321. https://doi.org/10.1152/ajpendo.00054.2012
This review examines how exercise-induced changes in the NAD+/NADH ratio drive mitochondrial adaptations and improve metabolic health.
Lanza, I. R., Short, D. K., Short, K. R., Raghavakaimal, S., Basu, R., Joyner, M. J., McConnell, J. P., & Nair, K. S. (2008). Endurance exercise as a countermeasure for aging. Diabetes, *57*(11), 2933–2942. https://doi.org/10.2337/db08-0349
This human study shows that exercise training reverses age-related declines in mitochondrial function and NAD+ metabolism.
References on Fasting, Caloric Restriction, and NAD+ Balance
Rodgers, J. T., Lerin, C., Haas, W., Gygi, S. P., Spiegelman, B. M., & Puigserver, P. (2005). Nutrient control of glucose homeostasis through a complex of PGC-1α and SIRT1. Nature, *434*(7029), 113–118. https://doi.org/10.1038/nature03354
*This paper establishes that fasting activates SIRT1 through increased NAD+ availability, linking nutrient deprivation to cellular energy regulation.*
Cantó, C., & Auwerx, J. (2009). PGC-1alpha, SIRT1 and AMPK, an energy sensing network that controls energy expenditure. Current Opinion in Lipidology, *20*(2), 98–105. https://doi.org/10.1097/MOL.0b013e328328d0a4
A review of the interconnected network through which fasting and energy stress regulate NAD+ levels and mitochondrial function.
Mitchell, S. J., Bernier, M., Mattison, J. A., Aon, M. A., Kaiser, T. A., Anson, R. M., Ikeno, Y., Anderson, R. M., Ingram, D. K., & de Cabo, R. (2019). Daily fasting improves health and survival in male mice independent of diet composition and calories. Cell Metabolism, *29*(1), 221–228. https://doi.org/10.1016/j.cmet.2018.08.011
This study demonstrates that time-restricted feeding enhances NAD+ levels and improves metabolic health independently of caloric intake.
References on Circadian Rhythms, Sleep, and NAD+ Balance
Nakahata, Y., Sahar, S., Astarita, G., Kaluzova, M., & Sassone-Corsi, P. (2009). Circadian control of the NAD+ salvage pathway by CLOCK-SIRT1. Science, *324*(5927), 654–657. https://doi.org/10.1126/science.1170803
A landmark study showing that the circadian clock directly regulates NAD+ levels by controlling the rate-limiting enzyme NAMPT.
Ramsey, K. M., Yoshino, J., Brace, C. S., Abrassart, D., Kobayashi, Y., Marcheva, B., Hong, H. K., Chong, J. L., Buhr, E. D., Lee, C., Takahashi, J. S., Imai, S., & Bass, J. (2009). Circadian clock feedback cycle through NAMPT-mediated NAD+ biosynthesis. Science, *324*(5927), 651–654. https://doi.org/10.1126/science.1171641
This complementary study demonstrates the reciprocal relationship between circadian rhythms and NAD+ metabolism, establishing a feedback loop.
Bass, J., & Takahashi, J. S. (2010). Circadian integration of metabolism and energetics. Science, *330*(6009), 1349–1354. https://doi.org/10.1126/science.1195027
A comprehensive review of how circadian disruption impairs metabolic regulation, including NAD+ homeostasis.
Pérez-Nievas, B. G., et al. (2013). “Dissecting phenotypic traits linked to human resilience to Alzheimer’s pathology.” Brain, 136(8), 2510–2526.
This paper is famous for showing that resilient people have different synaptic protein profiles despite having plaques and tangles.
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This article is for educational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your physician before making health decisions based on the TyG Index or other biomarkers.
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