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Jun 10
Spermidine is a naturally occurring compound found in all living cells.
It is one of the most potent known activators of autophagy, the cellular self-cleaning process that declines with age.
Research on spermidine has expanded dramatically in the last decade and the findings are among the most exciting in longevity science. 🧵
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Jun 10
The richest dietary sources of spermidine are wheat germ, which contains the highest concentration of any food, aged cheeses particularly cheddar and parmesan, mushrooms, soy products including natto and tofu, whole grains, legumes, and broccoli.
Notably, the traditional Mediterranean and Japanese diets that correlate most strongly with longevity are both naturally high in spermidine-rich foods.
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Jun 10
Spermidine supplementation is now available in concentrated wheat germ extract form.
The most studied doses in human trials range from one to two milligrams of spermidine daily.
The compound is safe, well-tolerated, and has no significant adverse effects reported in trials to date.
Increasing dietary sources first is the most practical starting point before considering supplementation.
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Jun 10
Body weight is the most commonly tracked health metric in the world.
It is also one of the least informative.
Two people can weigh exactly the same and have completely different metabolic health, cardiovascular risk, and biological age.
What you are made of matters enormously more than how much you weigh. 🧵
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Jun 10
Muscle mass is the other half of the equation.
Losing weight without preserving muscle is one of the most common and damaging mistakes in dieting.
Every pound of muscle lost slows metabolism, reduces insulin sensitivity, weakens immune reserves, and accelerates biological aging.
The goal should never be weight loss alone.
It should always be fat loss with muscle preservation.
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Jun 10
The most informative way to track body composition is a DEXA scan, which measures lean mass, fat mass, and bone density separately and can identify visceral fat directly.
Waist circumference is the most accessible proxy.
A waist measurement above 35 inches for women or 40 inches for men is a reliable indicator of elevated visceral fat regardless of total body weight.
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Jun 9
Red light therapy, also called photobiomodulation, uses specific wavelengths of red and near-infrared light between 630 and 850 nanometers to stimulate biological processes inside cells.
It was once considered fringe.
The peer-reviewed literature now includes over 5,000 published studies.
The mechanisms are well understood and the applications are expanding rapidly. 🧵
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Jun 9
The research on red light therapy and brain health is particularly compelling.
Several studies have found that transcranial near-infrared light applied to the skull improves memory, reaction time, executive function, and mood in both healthy adults and those with traumatic brain injury.
The proposed mechanism involves improved mitochondrial function in neurons and reduced neuroinflammation.
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Jun 9
Effective devices for home use are now available at a wide range of price points.
For general recovery and skin benefits, panels delivering around 100 milliwatts per square centimeter at the skin surface with wavelengths of 660nm red and 850nm near-infrared are most studied.
Sessions of ten to twenty minutes at a distance of six to twelve inches, performed three to five times per week, reflect the protocols used in most successful trials.
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Jun 9
Zinc is required for the activity of over 300 enzymes in the human body.
It is essential for immune function, DNA synthesis, wound healing, testosterone production, thyroid function, taste and smell, and cellular repair.
It is also one of the most commonly deficient minerals in adults over 50, with an estimated 30% of older adults failing to meet minimum requirements. 🧵
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Jun 9
The richest dietary sources of zinc are oysters, which contain more zinc per serving than any other food, followed by red meat, shellfish, pumpkin seeds, hemp seeds, legumes, and nuts.
Plant-based sources contain phytates which bind zinc and reduce absorption significantly.
People eating primarily plant-based diets require higher zinc intake to compensate for this reduced bioavailability.
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Jun 9
A reasonable supplemental dose for adults is eight to fifteen milligrams of zinc daily taken with food to prevent nausea.
Zinc picolinate and zinc bisglycinate are the best-absorbed forms.
Zinc competes with copper for absorption, so long-term supplementation above fifteen milligrams should be paired with one to two milligrams of copper to maintain proper balance.
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