Mechanisms that may be Disrupted to Slow Aging from Dr. Michael Greger’s How Not to Age
ALL of these MECHANISMS can be DISRUPTED by LIMITING PROTEIN intake to 0.8g/kg body weight. This turns out to be around 45g and 55g for the average woman and man, respectively. See the image below to give you an idea of grams of protein per serving of various plant protein sources.
1. DNA Damage & Repair · Aging begins with accumulated DNA damage.
Top Foods: berries, greens, herbs/spices.
2. Telomere Shortening · Telomeres protect chromosomes but shorten with age.
Top Foods/Lifestyle: plant-rich diet, stress reduction, exercise.
3. Epigenetic Changes · Lifestyle influences gene expression.
Top Foods: polyphenol-rich plants (berries, greens, tea).
4. Mitochondrial Dysfunction · Mitochondria weaken over time.
Top Foods: leafy greens, beets, whole plant foods.
5. Cellular Senescence · Senescent “zombie cells” drive inflammation.
Top Foods: cruciferous vegetables, berries.
6. Stem Cell Exhaustion · Stem cells decline with age.
Top Foods: phytonutrient-rich plants, anti-inflammatory diet.
7. Chronic Inflammation ("Inflamm-aging") · Low-grade inflammation accelerates aging.
Top Foods: berries, nuts, greens, turmeric, ginger.
8. Immune Dysregulation · Aging weakens immunity.
Top Foods: fiber-rich plants, fermented foods, prebiotics.
9. Hormonal Dysregulation · Aging alters IGF-1, insulin, cortisol, sex hormones.
Top Foods/Lifestyle: plant-based diet, movement, stress reduction.
10. Protein Misfolding & Aggregation · Misfolded proteins accumulate (e.g., amyloid).
Top Foods: antioxidant-rich plants, whole-food diet.
11. Cross-Linking (AGEs) · AGEs stiffen tissues and impair function.
Top Foods/Lifestyle: minimize high-heat cooking, avoid processed foods.
At a Glance: The Big Picture
Reduce Damage: oxidation, inflammation, glycation.
Support Repair: DNA repair, mitochondria, stem cells.
Optimize Signaling: hormones, immune system, epigenetics.
And if you are looking for more background...
HOW NOT TO AGE research on aging revolves heavily around mTOR (mechanistic Target of Rapamycin), which he often describes as the "aging engine" or the "growth controller" of our cells.
Here is the breakdown of how protein and the slowing of the biological clock go together:
1. The "mTOR" Connection
mTOR is an enzyme that senses the presence of nutrients—specifically protein.
When mTOR is high: The body is in "growth mode" (building muscle, but also potentially speeding up aging and cancer cell proliferation).
When mTOR is low: The body enters "maintenance/repair mode" (autophagy), where it cleans out cellular "junk" and repairs DNA.
The Aging Link: By keeping protein intake moderate (hitting the RDA but not exceeding it), you keep mTOR from staying in high gear, which is a primary mechanism for slowing down the aging process.
2. Animal vs. Plant Protein
This is a huge part of the anti-aging protein message. Animal proteins (meat, dairy, eggs) have a higher concentration of branched-chain amino acids (BCAAs) like leucine.
Leucine is the primary "on switch" for mTOR.
Plant proteins are naturally lower in these specific amino acids, meaning they don't "redline" the aging engine the way animal proteins do.
3. IGF-1 (Insulin-like Growth Factor 1)
Research shows that animal protein consumption increases levels of IGF-1, a growth hormone.
While IGF-1 is great when you’re a growing child, having high levels as an adult is like "putting your foot on the gas pedal" of aging.
It has been linked to increased risk of cancer and a shorter lifespan. Switching to plant-based protein sources helps naturally lower IGF-1 levels to a safer, more "anti-aging" range.
4. Methionine Restriction
Methionine is an amino acid found in high levels in animal products (especially chicken and fish).
Research across many species shows that restricting methionine can significantly extend lifespan.
Since it is difficult to "restrict" an essential amino acid while eating meat, a plant-based diet is the most practical way to achieve methionine restriction naturally.
5. Kidney Health and Longevity
Aging is often accelerated by the decline of organ function. Animal protein causes "hyperfiltration" (the kidneys have to work much harder to process the nitrogen waste), whereas plant protein does not cause this stress. Keeping your kidneys "young" is vital for overall longevity.
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