Boosting Immune System and Thymus Regeneration for Longevity Insights

Genetics 0:55 0
“you could actually regrow the thymus of old rats and I thought well this is incredible fantastic so I looked at the paper it was very impressive”

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Genetics 4:03 0
“you might be able to tree thymic involution out the age of median lifespan of humans on the order of 70 or plus years of age and do something”

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Hormone balance 4:35 0
“what happens when people get growth hormone is that their insulin resistance goes you know down the tubes and so you can double and triple the the insulin levels in in people and even increase the glucose levels if you have a high enough growth hormone dose”

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Hormone balance 5:39 0
“I think there are still some docs who will prescribe growth hormone to elderly people for potential anti-aging effects but yes the metabolic side effects are concerning.”

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Hormone balance 7:31 0
“growth hormone particularly in the elderly will increase muscle mass but perhaps not strength.”

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Hormone balance 7:52 0
“if you combine growth hormone with testosterone then the muscle strength does increase.”

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Hormone balance 9:51 0
“growth hormone seemed like the way to go it has a lot of other anti-aging effects but yeah it does have this insulin elevating effect and it does have some clouds on the horizon about these Mouse studies that have to be cleared up.”

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Hormone balance 10:53 0
“when you are young you got plenty a growth hormone but you're not diabetic but when you give growth hormone to older people they become diabetic”

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Hormone balance 11:18 0
“what if the hidden sleeper function of DHA was actually to prevent specifically hyperinsulinemia induced by growth hormone”

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Hormone balance 12:26 0
“growth hormone takes us back to the era of being a fat burner”

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Hormone balance 13:43 0
“DHEA helps to block the lipolysis of the actually DHA contributes to lipolysis itself but also turns over the lipid but burns the fatty acids and has other effects that mitigate the effects of the fatty increase”

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Metabolic health 16:40 0
“turns out that the sugar does go down uh when you fall asleep at night after taking the the medications but not to threatening levels and it comes back up again”

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Disease prevention 17:18 0
“there is a report showing that diabetics who take metformin lived longer than normal people who did not have diabetes that was not reproduced”

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Disease prevention 17:54 0
“UK biobank people taking sglt2 Inhibitors seem to have lower all cause mortality so there may be a better case for a longevity effect”

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Disease prevention 22:40 0
“if you don't have a thymus you die well that's a good reason that's a fundamental reason”

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Disease prevention 23:31 0
“within a fouryear period of time if you had your thymus taken out this is as adults right these are people who've already had their thymus involuted for a long time or mostly involuted you know when you go through puberty your your thymus involuted so you don't have much left even when you're 40 when you say involute again just just can you just Define that I mean we sort of already talked about there's fatty infiltration loss of cells but what is the definition of fic involution fic involution is a process of thic atrophy that takes place largely about the time you go through puberty and it it seems to be triggered by puberty although there's at least one paper that disputes that but uh essentially the process consists of loss of functional thymic mass and replacement of that functional thymic Mass with adapost tissue”

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Disease prevention 24:42 0
“within four years your risk of dying is increased by a factor of three um your risk of having cognitive declines or other functional deficits increases by a factor of two wow if you've had cancer before your risk of having cancer recur increases by about a factor of before and if you have had cancer before and it does recur the chance that it recurs in a particularly nasty and varent form that's hard to control increases by a factor of seven”

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Disease prevention 25:44 0
“the function of the thymus is to essentially manufacture like half of your immune system”

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Disease prevention 27:41 0
“that's the reason that when you take the thymus out you die of cancer because the theory is that we have cancer surveillance all the time and as long as your immune system is competent it can deal with that.”

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Disease prevention 29:34 0
“as we get older and the thymuses influence wanes we're going to get more autoimmune disorders which means if you grow the thymus you restore that function they should go away that's what we see.”

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Disease prevention 31:58 0
“between the ages of 62 and 78 you lose 98% of your ability to recognize foreign antigens and you still have a lot of capacity left but nevertheless that's a significant hit.”

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Immunizations 33:06 0
“restore your immune system because the immune system is programmed to die at the age of 12 so you have to regrow that you have to reverse that aging clock uh and if you don't do that no matter what else you do you're gonna die”

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Immunizations 33:22 0
“has anybody looked at whether you can use reprogramming and and I mean people have done partial transient reprogramming in mice and looked at whether that has an effect on thymic function or has it just not been studied yet”

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Immunizations 35:17 0
“what we saw is an increase in both CD4 and cd8 T cells”

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Immunizations 36:52 0
“we saw in our most recent study an increase in those of 60%”

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Disease prevention 38:40 0
“that they did not see an increase in tumors or or cancer very interesting”

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Disease prevention 39:35 0
“there's been no tendency for an increase in cancer”

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Immunizations 42:21 0
“we would expect to see that so we could we could do a similar experiment in mice and rats but and also in people is what I'm wondering”

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Immunizations 48:17 0
“it's like 90% of all flu deaths for people over the age of 65 right okay so there you go it's right there and the same thing for uh uh lung uh diseases as well.”

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Immunizations 48:05 0
“being able to show that you get a better vaccine response would be super powerful”

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Disease prevention 49:33 0
“so that you'll have a better anti-cancer response and the trouble with those drugs is they have a lot of side effects they can't be kept going for very long and they're like 100,00 a year or something like that so we actually were got able to get a reduction of those cells just by improving thymic function apparently”

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Exercise 52:19 0
“we had these people go over to our facility here and and find out how strong they were and how long they could keep exercising you know how how resistant they were to build up of lactic acid in their muscles which prevent you from continuing exercise and how good their lungs are how much oxygen can you move in and out of your body in a in a you know it when you're exercising at your maximum capacity and what we found is that all of these things show huge improvements”

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Genetics 55:14 0
“we haven't found a limit yet so I actually want to extend the age limit but we still need to get more data for people over the age of 70”

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Genetics 55:50 0
“we've done basically two and a half studies so far so origal trim study which we published an aging cell that was only a net of nine guys”

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Genetics 57:23 0
“we looked at 21 different aging clocks but they're all different flavors of algorithm just looking at different methylation groups”

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Genetics 58:05 0
“there's no question that that epigenetic patterns ep the epigenome changes with age there are patterns that you can identify that are strongly correlated with chronological age and with health trajectories as we age”

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Circadian rhythm 1:01:30 0
“biological aging as measured by some of these clocks is circadian if you measure your age at 4M versus 11:00 a.m. you're going to get a different result”

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Circadian rhythm 1:02:07 0
“I think that that these clocks that that your biological age is not static it fluctuates it's Dynamic it's Dynamic and there's a trend and over time you change in a certain direction but any short period of time you can bounce around a little bit.”

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Circadian rhythm 1:02:32 0
“if we believe that the clocks have meaning in terms of charting aging that's what they're telling us and I think we should go where the data point”

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Exercise 1:05:38 0
“but we are looking at things like muscle strength, Exercise capacity, V2 Max, and things like diastolic blood pressure, pulse rate in trim XA went from what was it 70 to 60 after one year”

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Exercise 1:06:36 0
“we've known for decades that you can accomplish many of those same things if you take sedentary overweight people and you get them to eat a healthy diet and exercise regularly and pay attention to their sleep”

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Nutrition 1:06:36 0
“you can accomplish many of those same things if you take sedentary overweight people and you get them to eat a healthy diet”

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Sleep 1:06:36 0
“you can accomplish many of those same things if you take sedentary overweight people and you get them to eat a healthy diet and exercise regularly and pay attention to their sleep”

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Genetics 1:11:47 0
“there is this wonderful paper in the literature in which they trace the effects of those growth hormone knockouts what happens in the adult and it turns out that what happens in normal aging adult uh I think that's mice uh is that there is an inflammatory um state that arises in the brain as a result of igf-1 signaling in the normal animal but in The Knockouts that state is precluded because the brain is wired differently”

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Genetics 1:12:53 0
“these animals live longer and oh isn't that wonderful but no it's terrible because they live longer if you put them in a temperature controlled cage with no pathogens around yeah but if you put them in a normal environment they don't survive they can't maintain their body temperature and they have no immune systems to speak of”

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Genetics 1:13:11 0
“the single greatest genetic determinant of body sizing dogs is igf-1 now it is the case that small dogs go through development with lower igf-1 that's why they have smaller body size but they don't seem to be imuno compromised in any way”

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Hormone balance 1:17:13 0
“there are people thinking about you know therapies to reduce igf-1 in adults and there's a whole school of thought that reducing igf-1 is going to protect against cancer”

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Hormone balance 1:18:22 0
“growth hormone metformin d haa that's tried and true that seems to be working”

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Disease prevention 1:22:50 0
“the first brother had a stable plasma feno age for 7.7 years and the second brother had a better plas pheno age after 8.8 years than he did at the beginning”

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Disease prevention 1:24:08 0
“for the CD4 uh naive te- cells uh the uh Primm uh Improvement was about 133% and as I kind of indicated before I was a little bit disappointed by that because if you're an AIDS victim you get a higher percent when you regrow your thymus”

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Hormone balance 1:26:08 0
“testosterone causes thymic involution or at least a decline in thymic function”

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Hormone balance 1:28:05 0
“whether or not testosterone or hormone replacement therapy in women is a longevity treatment I think for lots of people it's a quality of life treatment”

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Hormone balance 1:29:10 0
“we know that the thymus atrophies progressively with age and that sex hormones are probably contributing to that”

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Hormone balance 1:30:18 0
“when women are pregnant their thymus involutes somewhat and when the pregnancy is over it grows”

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Most important takeaways of the video

  1. Growth hormone administration can significantly worsen insulin resistance, leading to increased insulin and glucose levels, especially in older individuals.
  2. Research on rats has shown potential for regrowing the thymus in aged animals, suggesting implications for aging research and potential treatments.
  3. Thymic involution in humans around the median lifespan age of 70 years or older may be treatable, impacting aging and immune system function in older adults.
  4. Combining growth hormone with testosterone can increase muscle strength, but this combination is not typically recommended due to associated health risks.
  5. Thymus removal in adults significantly increases the risk of mortality and various health issues, including a threefold increase in death risk and higher cancer recurrence rates.

Over the course of this discussion, Dr. Greg Fahy and colleagues explored several interconnected themes around immune aging, hormone balance, and longevity interventions:

Thymus Regeneration & Immune Function

  • In rodents, it’s possible to regenerate a largely involuted thymus late in life, sparking hope that similar approaches could one day “reset” human immune aging around or beyond the typical lifespan (~70 years).

  • The thymus manufactures roughly half of our T-cell repertoire. After puberty it atrophies, leading to fatty infiltration and a steep decline in new T-cell output. In adults whose thymus has been removed, mortality triples within four years, cognitive and functional decline doubles, and cancer recurrence risks (especially aggressive forms) can increase up to sevenfold.

  • Restoring thymic function has reversed age-related autoimmune tendencies and boosted counts of recent thymic immigrants (new T-cells) by around 60%, without apparent increases in cancer incidence in short-term studies.

Hormone Balance & Metabolic Side Effects

  • Growth hormone (GH) therapy can regenerate muscle mass in the elderly but often worsens insulin resistance (“down the tubes”), driving up insulin and glucose levels and even precipitating diabetes. Some practitioners still prescribe GH for anti-aging, but its metabolic downsides and murky long-term safety demand caution.

  • Combining GH with testosterone appears to enhance strength, not just mass, but carries additional risks. Conversely, DHEA may counterbalance GH-induced hyperinsulinemia, hinting at multi-axis hormone protocols (e.g., GH + metformin + DHEA) under investigation for quality-of-life benefits rather than pure lifespan extension.

  • Sex hormones broadly contribute to thymic involution: testosterone accelerates it, while life events like pregnancy temporarily shrink and then restore thymic tissue.

Disease Prevention & Repurposed Drugs

  • Metformin emerged early as a candidate longevity drug—initial reports suggested diabetic patients on metformin outlived non-diabetics, though these findings have not held up robustly. In contrast, large observational data (UK Biobank) indicate SGLT2 inhibitors correlate with reduced all-cause mortality, meriting further study.

  • Oral hypoglycemics like metformin also modestly lower nocturnal blood sugars without risking hypoglycemia, but their broader anti-aging value remains unproven in rigorous trials.

Epigenetic & Circadian Aging Clocks

  • Aging clocks based on DNA methylation (“epigenetic patterns”) reliably correlate with chronological age and health trajectories. However, these measures fluctuate meaningfully across the day—biological age readings at 4 AM vs. 11 AM can differ, underscoring a circadian dimension to cellular aging. While clocks show dynamic short-term variation, long-term trends track overall biological aging.

Exercise Capacity & Lifestyle

  • Beyond molecular interventions, classical lifestyle measures—regular exercise, a healthy diet, and adequate sleep—yield many of the same improvements in muscle strength, VO₂ max, blood pressure, and pulse rate observed in clinical “rejuvenation” trials. In one year, participants saw pulse rates drop from ~70 bpm to ~60 bpm and diastolic blood pressure from the mid-80s to upper-60s.

Genetic Insights from Animal Models

  • Mouse models lacking GH/IGF-1 signaling live longer under pathogen-free, temperature-controlled conditions but fail in natural environments due to immune deficits and poor thermoregulation. By contrast, smaller dog breeds with lower IGF-1 levels do not suffer obvious immune compromise, highlighting species-specific trade-offs.

Overall, the vaccination of immune rejuvenation, hormone modulation, repurposed metabolic drugs, epigenetic clocks, and proven lifestyle pillars form a multifaceted roadmap for extending healthy lifespan. Each approach carries its own benefits and risks—and while cutting-edge biotechnologies hold promise, they currently complement rather than replace time-tested habits of diet, movement, and sleep.