Biohacking Weekly 75: Why Stress Leaves You Tired but Wired

This is Biohacking Weekly — a curated news roundup designed to help you increase your longevity, improve healthspan and access OptimOZ product picks.

1. How Chronic Stress Pushes the Body Into Survival Mode

On The Dr. Hyman Show, an internal medicine physician Dr. Scott Sherr explains what he calls the “Sympathetic Spiral of Doom” — a destructive feedback loop between chronic stress and mitochondrial dysfunction.

According to Dr. Sherr, constant fight-or-flight activation forces mitochondria, the cell’s energy producers, to keep generating more energy under pressure. Over time, they become overwhelmed, energy production drops, oxidative stress rises, and the body shifts into a “cell danger response”, prioritizing survival over recovery and performance.

People stuck in this state often feel “tired but wired,” anxious, mentally foggy and unable to recover from workouts or poor sleep. Dr. Sherr warns that many cannot simply “meditate their way out” because aggressively calming the nervous system too early can trigger crashes when mitochondrial reserves are depleted.

His solution is sequential: support mitochondrial function first, then gradually calm the nervous system and address deeper root causes behind the chronic stress cycle.

→ Source: Dr. Hyman

2. Eggs Linked to Lower Alzheimer’s Risk in Large Study

Researchers at Loma Linda University Health found that adults over 65 who ate eggs regularly had a lower risk of developing Alzheimer’s disease. In the 15-year study of nearly 40,000 participants, eating eggs five or more times weekly was associated with a 27% lower risk. Even moderate intake showed benefits: 1-3 servings monthly reduced risk by 17%, while 2-4 servings weekly lowered it by 20%.

The protective effect may come from a dense mix of brain-active nutrients packed into egg yolks. Choline supports acetylcholine production, a neurotransmitter essential for memory formation, while lutein and zeaxanthin help counter oxidative stress that can damage neurons over time. Researchers also tracked eggs hidden in baked foods, not just visible servings like omelets or boiled eggs.

→ Source: Oh J., et al., The Journal of Nutrition (2026)

3. Extended Fasting May Trigger Deeper Cellular “Cleanup”

David Sinclair said fasting beyond 14–16 hours may activate deeper cellular recycling linked to longevity. Sinclair explained that after roughly three days without food, the body activates the type of cellular recycling called chaperone-mediated autophagy — a deep cleansing of old and damaged proteins. Sinclair said he personally attempts a three-day fast about once per month.

Sinclair described chaperone-mediated autophagy as a highly selective cleanup system rather than a general breakdown process. Specialized “chaperone” proteins identify damaged cellular components and escort them to lysosomes, where they are dismantled and reused. According to Sinclair, the body delays this process because it requires substantial energy. Only after glycogen stores fall and fat metabolism increases does the body shift into deeper maintenance mode.

→ Source: The Diary Of A CEO Clips

4. Neurotransmitters Quietly Control Far More Than Mood

A recent Nautilus article explored how neurotransmitters act far beyond the brain.

Dopamine, best known for motivation and reward, also helps the kidneys regulate salt balance and blood pressure. In the pancreas, dopamine shapes insulin and glucagon release after meals, linking brain chemistry directly to metabolic control.

Serotonin, meanwhile, plays a major role in digestion, immune signaling, and communication between gut microbes and the body. Researchers are also studying serotonin’s role in suppressing brown fat thermogenesis, a process tied to calorie burning and obesity risk.

The emerging picture resembles a hidden biochemical network: molecules once viewed as brain messengers are now seen as body-wide regulators tied to metabolism, immunity, cardiovascular health, and ageing.

→ Source: Nautilus

5. Men and Women Age Differently at the Immune Level

A new study shows that the immune system ages in different ways in men and women. Older women develop more “killer” immune T cells, which may help fight viruses but can also increase the risk of autoimmune diseases, where the body attacks its own tissues. Men keep more immature B cells as they age, a pattern linked to a higher risk of leukemia.

Researchers also found that women experience stronger overall immune changes with age. Ageing already pushes the body into “inflammaging,” a constant low-level inflammation linked to cancer, infections, and heart disease. The study suggests that treatments for healthy ageing may work better if they are designed differently for men and women.

→ Source: Lifespan Research Institute