Thomas DeLauer

Research into grounding has produced some initial positive signals, but the studies are very small and have not been independently replicated. The only controlled experiment had just sixteen participants, which is not enough to make firm claims about effects on cortisol. The direction may be correct, but the claim that grounding lowers cortisol levels is not yet adequately supported by sufficient evidence.

Both are correct. A ten-to-fifteen-minute walk after a meal demonstrably lowers the blood sugar peak, and this has been measured in multiple studies. Cooling cooked starch produces resistant starch that the small intestine does not digest, and a review of 36 randomised studies confirms the lower peak. Both effects are modest, but real.

The first part is well supported: higher protein intake goes hand in hand with better muscle preservation, especially in older adults and when combined with strength training. The second part is contested. The relationship between protein intake and mortality varies considerably depending on the source: research points to more favourable outcomes for plant protein than for animal protein, and the picture differs between middle age and old age.

That a severely carbohydrate-restricted diet substantially lowers triglycerides and reduces liver fat has been observed in several short-term studies, and halving of triglycerides is not uncommon in that context. The studies are small, last a few months, and say nothing about long-term adherence or what happens afterwards.

This is supported by the strongest evidence in this series: a randomised study found that better adherence to a Mediterranean diet was associated with a lower estimated biological age based on DNA methylation, measured over eighteen months. What a slowdown in such a clock actually means for health or lifespan remains an open question; it is a measure, not an outcome.

A systematic review with meta-analysis does find this association, so the claim is accurately summarised. However, it remains an association: people who eat a Mediterranean diet also tend to exercise more, smoke less and have a higher income, all of which are likewise associated with telomere length. Moreover, telomere length in white blood cells is an unreliable measure that varies considerably between measurements.

There are trials in which a Mediterranean diet lowered markers of oxidative damage. These are short-term studies measuring intermediate outcomes in blood and urine, not studies demonstrating actual DNA damage or the prevention of disease. The direction of effect is consistent; its long-term significance remains unknown.

That intense exercise temporarily increases the permeability of your intestinal wall is well established, particularly in heat and over long durations. The explanation, however, is a different one: during exercise, less blood flows to your intestines. The idea that glutamine depletion is the cause remains a hypothesis; taking glutamine supplements produces inconsistent and modest results in studies.

The conclusion is roughly correct, but the reasoning is not. GABA does indeed barely reach the brain, but not because the molecule is too large; it is actually quite small. The problem is that the blood-brain barrier has virtually no transport mechanism for it and actively pumps it back out. This is more than a minor detail: anyone who thinks size is the issue will quickly be persuaded by tricks claiming to smuggle it across.

Correct. Prolonged elevated cortisol directs fat to the abdominal cavity, around the organs. This is most clearly seen in Cushing's syndrome, where cortisol levels are extremely high, and in a milder form in chronic stress.

Oestrogen demonstrably affects the energy-producing organelles in cells and suppresses inflammation, but this has been shown primarily in cell and animal studies and in women around the time of menopause. The confidence with which it is presented here as a general booster goes beyond what has actually been demonstrated in humans.

Essentially correct. ATP is supposed to stay inside the cell; when it leaks out, the immune system recognises it as a danger signal and an inflammatory response follows. That mechanism is well researched. One caveat: it is a localised signal associated with tissue damage, not a state that your entire body is in.

The claim that cells switch to burning sugar without oxygen under severe stress is correct and well documented. The framework around it is not: the cell danger response is the hypothesis of a single research group and is presented here as established biology. That distinction matters, because entire treatment plans are being built on that hypothesis.

This is the supplement industry's best-known sales pitch. The analyses it relies on compare old and new food composition tables, and these show modest declines in some crops and substances, not 70 to 80 percent. Part of what is measured is also explained by the fact that modern varieties are larger and have a higher water content, not by depleted soils.

Correct, when it comes to fitness. Short high-intensity intervals produce a comparable or greater improvement in your maximum oxygen uptake than training at an easy pace for much longer. There is a limit, though: for long-distance endurance and recovery, steady-state training retains its own distinct value.

Exercise considerably slows down the decline, and that is one of the best-supported things we know. But it does not prevent it: muscle mass, bone density and endurance decrease even in lifelong athletes, just from a higher starting point and more slowly.

Two things are being linked here that each hold up on their own. Nasal breathing and humming do indeed increase the amount of nitric oxide in your nasal cavity, substantially so. And breathing slowly demonstrably has a calming effect. What has never been shown is that the first causes the second.

There are indications that sleep duration and certain hormones shift with the seasons. However, the claim that the body is in a deeper state of recovery in winter has not been established; measurements of the nervous system yield contradictory results. Plausible-sounding, but not yet supported by evidence.

Sleeping in the dark demonstrably helps: light at night suppresses melatonin and makes your sleep lighter. Complete darkness is not a requirement, however, and calling it essential overstates the case. A dark room makes a measurable difference; a pitch-black room adds little on top of that.

That light makes you more alert is well established: it suppresses melatonin and sharpens your biological clock. But that is alertness, not energy. Someone who is exhausted is still exhausted after half an hour in the sun; it just feels different. The speaker is also recounting their own personal experience here.

Fasting does indeed stimulate autophagy, the cellular cleanup system that breaks down and recycles damaged components. The evidence for this is robust and applies to multiple organs and tissues, including in humans. What the claim does not mention is that the precise threshold in hours has not yet been established for humans, and that prolonged fasting can also cause muscle breakdown through that same cleanup pathway. The direction is correct, then, but the reality is somewhat more nuanced than the claim suggests.

Urolithin A does indeed have a plausible mechanism of action through the removal of damaged mitochondria, and small human studies show cautiously positive signals for muscular endurance. However, the leap to 'improved cellular energy production' goes beyond the available evidence: UA supplements have not been shown to make muscles measurably more productive in terms of energy, and the primary endpoints in the human studies were not met. Moreover, the research comes largely from the manufacturer itself, without independent confirmation, so the chain from mitophagy to measurable health benefits has not yet been firmly established in humans.

That fasting stimulates autophagy is robustly supported and holds across multiple organs and tissues, including in humans. The word 'mitophagy', however, goes a step further: the evidence confirms the broader cellular cleaning system, but does not specifically address the targeted breakdown of damaged mitochondria as a separately demonstrated effect of fasting in humans. Furthermore, 'powerful stimulus' is a stronger claim than the human evidence warrants, as most knowledge about the magnitude of the effect still comes from smaller studies and animal research. The direction is correct, but the wording makes the evidence appear stronger than it is.

The idea that damaged mitochondria accumulate as we age is consistent with what research shows: several cellular clean-up systems weaken simultaneously and amplify each other's decline, leading to a build-up of damaged components. Mitochondrial mutations also demonstrably accumulate over the years. However, the claim is more specific than the evidence warrants: that mitophagy as a distinct process slows down measurably due to ageing and metabolic stress combined cannot be firmly established on the basis of current research. The direction is right, but the precise causal chain is not yet an established fact.

Heat, such as that experienced in a sauna, causes temporary cellular damage, after which the cell produces repair proteins as a recovery response, including heat shock proteins. With repeated exposure, that response grows stronger and the cell becomes more resilient. Research in this area has not yet been tested on a large scale in randomised trials, but the mechanistic basis and the findings from reviews point clearly in this direction.

Walking around mealtimes does indeed help to limit blood sugar spikes, and several randomised studies confirm this. However, the claim reverses the comparison: according to the available research, short walking breaks spread throughout the day are actually slightly more effective than a single longer walk after a meal, not less so. Whether timing walks around mealtimes produces a 'much stronger' effect compared to spreading them across the day cannot be substantiated; the studies describe the direction of the effect, but draw no such emphatic conclusion about the size of the difference.

The claim states a precise duration of five to seven days, but the research does not support this. In humans, there is no clinically established threshold in hours or days for triggering autophagy, and multiple reviews suggest that even ordinary intermittent fasting may be too short to measurably increase autophagy. Moreover, autophagy in living humans is not yet well measurable: existing methods are indirect and lack the precision to confirm a "significantly measurable effect". A claim about five to seven days therefore cannot be substantiated.

Lifestyle interventions involving diet, exercise and stress reduction are indeed being studied in people with cognitive decline, and there is some support for the idea that such a combination can slow or occasionally slightly improve early-stage forgetfulness. However, this applies to early cognitive problems, not specifically to Alzheimer's patients, and a full reversal has not been demonstrated. The figure of 70% cannot be substantiated on the basis of the available research, and the ongoing trials in Alzheimer's patients have not yet produced published results.

Several large observational studies show that long-term exposure to fine particulate matter is associated with an increased risk of dementia and faster memory decline, and living near heavy traffic fits that pattern. Nevertheless, the claim goes a step further than the evidence justifies: the associations found are correlations, and a direct causal relationship has not yet been conclusively demonstrated. Moreover, the available research focuses on dementia and cognitive decline in general, not specifically on Alzheimer's disease as a diagnosis.

Research does indeed show that it is not uncommon to have one organ that ages biologically faster than the rest of the body. Studies on brain aging indicate that 'nearly one in five people' has such an outlying organ, which aligns well with the claim. However, whether that figure applies specifically to Americans over the age of 50 cannot be established on the basis of available research: neither the age threshold nor the geographical scope appears in the studies. The direction of the claim is therefore correct, but its precision goes beyond what the evidence supports.

In chronic heart failure, CoQ10 did show a remarkably positive effect in one solid study: fewer deaths and hospital admissions after two years. The direction of the claim is therefore correct, but the precise figures of 26 to 15 percent cannot be substantiated on the basis of available research. Moreover, the evidence has not yet been confirmed by large independent replication studies, which means that the benefit found should be interpreted with caution.

Visceral fat does indeed disrupt hormonal balance and is associated with lower testosterone levels and increased oestrogen activity in men, a link that is reasonably well supported by observational and mechanistic research. The role of aromatase, the enzyme that converts testosterone into oestrogen, fits within this mechanistic picture. However, the available substantiated evidence does not specifically address the aromatase step itself, meaning the precision of the claim goes beyond what can be firmly established. The direction is correct, but the wording creates the impression of a well-established and clearly quantified mechanism, whereas the evidence is primarily observational and mechanistic in nature.

Large-scale research involving hundreds of thousands of people consistently shows that low grip strength is associated with a higher risk of premature death, with the strongest association for cardiovascular disease. The first half of the statement is therefore well supported. The claim that dead hangs are an equally strong or comparable predictor cannot be substantiated on the basis of the available research: this specific exercise is not studied as an independent predictor in that research. Moreover, the relationship is one of association, not causation, so whether training grip strength directly extends your lifespan remains an open question.

The claim that lower blood pressure reduces the risk of stroke and coronary heart disease is well supported by large-scale research. The direction of the statement is therefore correct. However, the specific figures cited: a 9% reduction in mortality from coronary heart disease and a 14% reduction from stroke for a drop of 5 mmHg, cannot be firmly established on the basis of the available research. What is clear is that the benefit appears to be greatest for stroke prevention, which is consistent with the order suggested by the statement.

Observational research does show signals that regularly drinking diet soda is associated with a higher risk of conditions such as metabolic syndrome and diabetes, but causality has not been established specifically for cardiovascular disease and cerebrovascular disorders. The claim presents an association as an established fact, whereas the studies contradict each other on certain points and selection bias can play a role in observational research. The direction of the signals is not reassuring, but the claim goes further than what the available evidence currently supports.

Several large analyses found an increased risk of heart attack and cardiovascular disease associated with the use of calcium supplements, which supports the direction of the claim. However, the most recent large analysis from 2023 found no significant association, leaving the conclusion uncertain. Moreover, the research focuses on cardiac risk in a broad sense, not specifically on people who already have an elevated risk of atherosclerosis or coronary calcification; that level of precision goes beyond what the available evidence can firmly establish.

Several randomised studies and meta-analyses show that short walking breaks after meals limit blood sugar spikes more effectively than a single longer walk afterwards. The claim is therefore correct in its general direction: spreading physical activity throughout the day beats doing it all in one continuous block. However, the claim goes further than the evidence supports: the walking breaks studied are typically much shorter than 15 minutes and are taken more than three times a day, and the comparison with exactly 45 minutes of continuous walking cannot be firmly established. Whether three 15-minute walks after each meal also outperform other ways of distributing those 45 minutes remains uncertain.

A walk after a meal does indeed help to limit blood sugar spikes, and this is well supported by multiple randomised studies and meta-analyses. However, the claim compares walking after a meal with walking before a meal, and the available studies say nothing specific about that comparison. Moreover, research suggests that short walking breaks spread throughout the day are more effective than a single longer walk afterwards, so claiming that timing after versus before a meal makes 'significantly more' of a difference goes further than the evidence allows.

Animal and laboratory research does indeed show promising results for taurine and ageing, and a lifespan extension in mice fits that picture. However, that precise figure of 10 to 12 percent does not appear in the available research we were able to assess, and in humans the effect on ageing has not yet been demonstrated. Clinical trials in humans are under way but have not yet produced published results, so the leap from mouse data to a concrete claim for humans is too large.

Morning light does indeed help synchronize your biological clock: several lines of research show that daylight shortly after waking is associated with a better sleep-wake cycle, and the biological mechanism through melatonin suppression is well understood. The cortisol part is more subtle: research shows that sunlight can influence cortisol regulation, but that effect is less well quantified and depends heavily on the duration and intensity of exposure. The specific claim that this must happen within the first hour after waking cannot be firmly supported by the available evidence.

Research does indeed show that taking more steps each day goes hand in hand with a lower risk of premature death, and that this relationship is already visible with a modest increase. However, the specific figure of 12% lower overall mortality per 1,000 extra steps cannot be substantiated on the basis of the available research. Studies point to a general association between more steps and a lower risk of death, where the benefit is greatest for those who currently move very little and levels off as you already take more steps. One fixed percentage per 1,000 steps implies a precision that the science simply does not offer.

Intermittent fasting does indeed improve insulin sensitivity in most people, but the claim is incorrect on two points. First, the research concerns fasting that is generally aligned with the early part of the day and the circadian rhythm, not specifically a break in the middle of the day. Second, the concept of 'metabolic flexibility' is absent from the available evidence: the studies measure fasting insulin and insulin resistance, not the broader capacity to switch smoothly between burning fat and burning sugar. The claim is therefore too precise and partly points in the wrong direction.

Getting enough exercise does indeed largely protect you against the risks of prolonged sitting, but it goes too far to say that this risk is fully cancelled out. Research shows that meeting physical activity guidelines largely neutralises the risks of sitting, while other studies indicate that prolonged sitting harms the heart even in people who exercise regularly. Moreover, the specific figure of 60 to 75 minutes per day is not firmly supported by the available research, and the word "fully" goes beyond what the studies actually show.

That more daily steps go hand in hand with a lower risk of death is well established: the association begins at just a few thousand steps a day and is consistent across large international studies. However, the specific figure of 5,800 steps and the associated reduction of exactly 40% do not appear in any research we can confirm. What science does show is that the greatest health gains come from the shift from little activity to more, and that the benefit levels off somewhere between 6,000 and 10,000 steps depending on your age.

Intermittent fasting improves insulin sensitivity in most people, and this applies to the 5:2 variant with two fasting days per week as well. However, the evidence comes predominantly from small, short-term studies, which means the claim is somewhat more categorical than the research data justify. Moreover, a direct comparison with regular calorie restriction is lacking, so whether this approach works better than simply eating less has not yet been established. In older adults and people who exercise intensively, potential muscle mass loss may also deserve attention.

The claim that 15 grams of collagen provides approximately 3 grams of glycine is correct in terms of composition, and there are preliminary signals that glycine (around 3 grams before bed) may slightly improve sleep quality. However, the evidence for this is thin: it is based on small studies, a significant portion of which come from the manufacturer itself. The specific claim that this supports connective tissue recovery during sleep goes beyond what the available research can firmly establish.

Urolithin A does indeed have a plausible mechanism of action through the clearance of damaged mitochondria, a process called mitophagy. The claim is therefore correct in its general direction. However, the assertion that damaged mitochondria are 'recycled into healthier mitochondria' is somewhat too categorical: mitophagy breaks down damaged mitochondria so that new ones can be produced, but those new mitochondria are not recycled versions of the old ones. Moreover, this mechanism has not yet been firmly established in humans, and the existing research comes largely from the manufacturer itself.

Research shows that fasting can activate AMPK and that this triggers processes such as fat burning. However, the claim states that mitochondria therefore burn fatty acids "preferentially" as fuel, which goes a step further than what the available evidence supports. The picture is also more nuanced: prolonged fasting actually did not activate AMPK in human muscle tissue, and the effects on mitochondria come largely from animal and cell studies. The general direction is correct, but the claim is more categorical than the available evidence justifies.

Same source and same limitation as the previous one: a snapshot from a population survey in which blood values and sleep complaints were measured at the same time. The percentage is genuinely calculated, but it says nothing about what happens when you start taking vitamin C supplements.

Correct, and this is one of the most useful things you can know about blood sugar. A contracting muscle draws glucose from your blood through its own pathway, with no need for insulin. That is why exercising after a meal works so directly.

The figure comes from animal studies and is accurate in that context, but it is presented here as though it applies to you. In animals that receive no nucleotides for seven days, the amount of RNA in the liver is halved. That tells us something about how essential these building blocks are, not that your liver faces this risk.

This too comes from rat studies in which part of the liver was removed. There, extra nucleotides inhibited protein breakdown and the liver recovered more quickly. It is a genuine finding, but the step to humans has never been made.

This has been observed in rats, and that detail is not mentioned. In animals fed a nucleotide-free diet, fat accumulates in the liver and the intestinal wall becomes thinner. Whether this also occurs in humans has never been studied, if only because a human diet free of nucleotides barely exists.

There is research pointing in this direction, but almost all of it comes from animal studies and from infant formula, to which nucleotides have been added for years. This has not been demonstrated in adults with intestinal damage.

Intestinal cells do indeed rely heavily on recycling existing building blocks and make use of what comes in through food. However, dependency is too strong a word: the body also produces nucleotides itself, and it is no coincidence that nucleotides do not appear on the list of nutrients you need to obtain from your diet.

It is true, and a fair point, that producing the building blocks for RNA is energy-intensive. However, the specific percentage cannot be verified: it varies considerably depending on the tissue and the circumstances, and a figure of 5 to 10 percent implies a level of precision that simply does not exist.

Correct, and this is one of the fastest renewal processes in your body. The cell layer lining your intestine is completely replaced within three to five days, starting from the intestinal crypts.