Siim Land

Several large population studies do indeed consistently show that eating more fiber is associated with a lower risk of colorectal cancer. The direction of the claim is therefore correct. However, the wording goes beyond what the evidence supports: according to the research, the optimal daily amount is around 25 to 29 grams, not specifically 40 grams, and the word 'significant' implies a level of precision that the associative studies do not fully deliver. Moreover, the evidence is associative rather than causal, although the biological explanation is well supported.

Multiple large population studies and overarching reviews consistently show that eating more fibre is associated with a clearly lower risk of colorectal cancer, particularly through whole grains. The evidence is associative but biologically well explained and strong enough to take seriously. Wholegrain bread, oats and legumes are concrete choices that support this effect.

Research consistently shows that eating more fibre is associated with a lower risk of colorectal cancer, and the evidence for this is strong. The claim therefore points in the right direction. However, it goes beyond what the evidence supports by specifying a threshold of 40 grams per day: that figure cannot be established on the basis of available research. Protection appears to increase with higher fibre intake, but a precise minimum amount at which the effect occurs has not been determined.

Research shows the opposite: that NAD+ declines with age has been consistently demonstrated in both humans and animals. The mechanisms behind this decline, such as the increase of pro-inflammatory cells that actively break down NAD+, are reasonably well understood. The claim that the amount of NAD in cells does not decrease significantly is therefore directly contradicted by the available research.

Research shows that the core of the claim is correct: older adults actually need more protein than the standard guideline recommends, and too little protein leads to weaker muscles and bones and a higher risk of falls. This does indeed argue against protein restriction in older adults. However, regarding mTOR inhibition in older adults specifically, the available evidence only shows that it extends lifespan in mice, with no proven interventions for humans yet. The claim presents mTOR inhibition in older adults as a demonstrated problem for muscle maintenance, but this goes beyond what the available evidence supports.

This is consistent with animal research: in fruit flies, the effect of rapamycin depends strongly on the composition of their diet, and with some diets the drug does not extend lifespan or even has a detrimental effect. That said, this tells us something about fruit flies, not about humans.

Research shows that resveratrol has no proven effect on ageing in humans yet, and some clinical trials, such as those on brain ageing, produced negative results. Nevertheless, the claim is too categorical: the research is not concluded, but limited. Animal and laboratory studies do show interesting effects, and the conclusion is more that evidence in humans is lacking than that the opposite has been definitively proven.

There are indications that omega-3, and EPA in particular, can dampen the skin's inflammatory response to UV radiation, but whether this also means that measurably less DNA damage occurs in skin cells has not yet been properly tested in humans. The available evidence on omega-3 and UV protection is limited and there is no consensus on an effective daily dose. The claim formulates the effect more concretely and with more certainty than the research justifies.

Omega-3 from fish oil reduces measurable inflammatory markers in the blood, and that effect has been demonstrated in research. However, the claim goes further than the evidence: it specifically names CRP, IL-6 and TNF-alpha as reduced markers, while research shows that the effect varies by condition and individual, and that the magnitude of the effect depends on factors including dosage. The direction is correct, but the claim gives the impression that supplementation reliably lowers all those markers in everyone, and that is a stronger assertion than the available evidence supports.

Research consistently shows that colorectal cancer screening reduces mortality, and faecal occult blood tests are widely recommended. However, the specific range of a 26% to 43% reduction in mortality is not supported by the available evidence, and the largest randomised trial showed no statistically significant reduction in mortality after ten years. The direction of the claim is correct, but those precise percentages cannot be substantiated on the basis of current research.

Sleep disruption and circadian dysregulation are indeed associated with an increased cancer risk and a more aggressive tumour course, and that association likely runs through multiple biological pathways. The evidence is strongest for night-shift work and breast cancer, and for the role of chronic inflammation in tumour formation in general. Specific evidence that cell cycle regulation, metabolism and immune function together form the link between circadian disruption and cancer progression does exist, but cause and effect are difficult to disentangle, also because cancer itself disrupts sleep. The claim is broadly correct, but states things with more certainty than the research warrants.

The direction of the claim is correct: human studies show no clear effect of NMN supplementation on weight, fasting glucose, or lipid levels. However, the conclusion that there is 'no significant improvement' sounds more definitive than the evidence warrants. The available studies are too small and were not primarily designed to measure these outcomes properly, meaning that an effect cannot be ruled out either; it may simply not have been demonstrated yet. A considerable number of clinical trials are still ongoing, so the final word on this has yet to be spoken.

Visceral fat is indeed more dangerous than subcutaneous fat: through direct pathways it disrupts the liver and other organs, and increases the risk of cardiovascular disease and diabetes, even in people with a normal weight. However, the phrase 'significantly more' in the claim goes further than what the research precisely indicates, as a concrete comparison of risk measures between the two fat types is not firmly established. The direction is correct, but the magnitude of the difference cannot simply be quantified.

The link between severe gum disease and a higher risk of cardiovascular disease has been demonstrated to be statistically robust. There is also consistent evidence from multiple studies, including a meta-analysis, for the connection with dementia, specifically via oral bacteria such as P. gingivalis. That said, the claim goes slightly further than the evidence allows: in humans, a causal relationship has not yet been established for either link, and a gingipain inhibitor that worked in mice had no effect on cognition in humans. The direction is correct, and the phrasing "associated with" honestly leaves the question of causality open, though it lacks the nuance that the evidence for the dementia link is weaker and less well established than that for cardiovascular disease.

Research does support the finding that a regular sleep schedule is associated with a lower risk of death, independent of total sleep duration: people with highly variable bedtimes and wake times face a higher risk of premature death, and that effect is indeed separate from how many hours they sleep. The claim that sleep regularity is a stronger predictor than sleep duration is therefore plausible, but the specific figures of 30 to 48 percent cannot be firmly established on the basis of the available research. Moreover, the evidence is at this point associative, meaning a causal relationship has not yet been demonstrated.

For muscular strength, the direction is correct: the greatest gains for health and survival come from building a basic level of strength, and resistance training is well supported as a means of reducing the risk of falls and premature death. For VO2 max, a higher value is also associated with longer life, without any clear ceiling being identified in the research. However, the claim that muscular strength specifically provides 'the majority of benefits' at a moderate level, while VO2 max continues to work up to 'very high levels', is a degree of precision that the available research does not support. Both associations have been demonstrated, but a direct comparison of the two curves is not substantiated.

Research shows that caloric restriction produces measurable metabolic benefits in humans, but there is no evidence that it slows the biological rate of ageing by a specific percentage. Available studies on epigenetic clocks and caloric restriction in humans are small and methodologically immature, which means those precise figures of 2 to 3 percent cannot be substantiated. The direction of the effect is biologically plausible, but genuine cellular rejuvenation and a quantified slowing of the ageing rate have not yet been demonstrated in humans through long-term research.

Visceral fat is linked to a clearly elevated risk of cardiovascular disease and heart failure in several large observational studies, so the direction of the claim is correct. The visceral adiposity index is a measure of that fat distribution pattern, but the claim goes beyond the available evidence by describing the risk as 'considerably elevated' and by listing stroke and cardiovascular mortality separately: that level of specificity cannot be substantiated by current research. Moreover, the evidence remains largely associative, meaning that causality has not yet been fully established.

The TRIIM protocol combines three substances for which the research is still limited. Growth hormone and DHEA have not been proven effective as anti-ageing treatments in healthy older adults, and the long-term safety of growth hormone is uncertain, including with regard to cancer risk. Metformin shows interesting signals from cell and animal research, but whether it genuinely slows ageing in people without diabetes remains an open question. The claim that this protocol replaces fat in the thymus with regenerated tissue and reduces epigenetic age goes beyond what current research into these three substances individually supports.

Population studies show positive associations between spermidine intake and less cognitive decline, but these are not demonstrated causal effects. Randomised trials in humans are still ongoing and largely incomplete, so the claim that a spermidine-rich diet improves cognitive scores in older adults with neurocognitive disorders goes beyond what the current evidence shows. The direction of the findings is cautiously positive, but a proven improvement in people with neurocognitive disorders has not yet been established.

Research confirms that autophagy is a genuine cellular cleanup and recycling system, and that spermidine is one of the best-supported candidates for activating this system. It is also correct that autophagy declines with ageing: this association has been demonstrated consistently across multiple animal species and is widely supported by review studies. The claim accurately summarises what the research shows, although definitive evidence in humans remains limited.

Large-scale population studies do indeed show a positive association between higher dietary spermidine intake and lower mortality, but these are observational studies that do not prove a causal relationship. The specific figure of approximately 30 percent lower mortality is not firmly established in the available research. Furthermore, the associations found apply to dietary patterns as a whole, so they cannot simply be attributed to spermidine alone.

Research shows that fasting can stimulate autophagy, but no established threshold in hours has been identified for humans. Several reviews even suggest that ordinary intermittent fasting may be too brief to measurably increase autophagy. Added to this, autophagy is difficult to measure reliably in living humans: the available methods are indirect and capture only a snapshot. The claim that sixteen hours of fasting demonstrably upregulates autophagy markers in humans goes beyond what current evidence supports.

The contribution of glycation to wrinkle formation and arterial ageing is well supported biologically: AGEs damage collagen, elastin and blood vessels, and the mechanism underlying skin ageing is plausible. The evidence for glycation's role in atherosclerotic plaque is less direct; the LDL- and apoB-driven plaque process is well described, but glycation's specific contribution to it is less firmly established in the research. The claim is therefore broadly correct, but the strength of the evidence differs for each component and the precise magnitude of each effect has not yet been determined.

Research shows that HIIT leads to greater fitness gains than regular cardio in cardiac patients, but whether this consistently holds true for healthy individuals as well cannot be established unambiguously from the available studies. The claim that both low-intensity cardio and HIIT increase VO2 max is correct in its direction, but the assertion that HIIT always produces greater short-term gains goes beyond what the evidence unambiguously supports. Moreover, the advantage of HIIT does not apply to all groups: in a certain form of heart failure, for example, it offers no benefit over regular cardio.

Research shows that a higher VO2 max is strongly associated with a longer lifespan and a lower risk of dying from cardiovascular disease. The direction of the claim is therefore correct. What the research does not confirm is that a specific value such as 50 represents a clear threshold below which 'considerable benefits' begin: the relationship appears to be continuous, with more always being better. Furthermore, whether VO2 max itself is the cause or primarily a measure of an active lifestyle has not yet been fully established.

It is plausible that poor sleep impairs muscle building, and there is a study that measured lower muscle protein synthesis under sleep restriction. A systematic review of seventeen studies does nuance the picture, however: a single sleepless night has little effect on strength, whereas multiple nights of short sleep do reduce force output during multi-joint exercises. The studies are small and of moderate quality.

There is a meta-analysis that found an increase of roughly this magnitude in older adults following omega-3 supplementation. However, the results of the various meta-analyses diverge, and a network analysis on sarcopenia places omega-3 clearly behind strength training and protein. As a standalone intervention, the effect is small and inconsistent.

It is well established that creatine produces additional lean mass gains during strength training, and multiple meta-analyses confirm this effect. However, the precise figure of 1.4 kilograms is more definitive than the literature warrants: it varies depending on the meta-analysis, the duration of the study, and the dosing protocol. Moreover, part of that gain consists of water retained in muscle cells rather than contractile tissue.

This finding comes from a meta-analysis of 49 studies involving 1,863 participants on protein supplementation during strength training. It found that the gains level off at around 1.6 grams per kilogram of body weight per day; the margin of uncertainty extended to well over two grams, so eating more is not harmful, it simply provides no additional benefit.

This is indeed what the research shows: the amount of androgen receptor in the muscle itself is associated with how much muscle someone gains from strength training, whereas blood hormone levels do not show that relationship. The studies involved are small, conducted in men, and report correlations of around 0.6, meaning androgen receptor density explains part of the variation but not all of it.

Correct, and it actually happens faster than fourteen days. After just one week of bed rest in healthy young people, clear muscle loss has been measured alongside reduced insulin sensitivity. At two weeks, the effect is greater. This is also why hospitals nowadays get patients up and moving as quickly as possible.

That 174 percent comes from a real study: high-intensity strength training in ninety-year-olds, published in 1990. It did involve ten highly frail nursing home residents who started from an extremely low baseline, and when that is the case, tripling one's strength is easier to achieve than for someone who already trains. The fact that substantial gains are still possible at an advanced age has since been confirmed multiple times.

That older adults respond less well to protein is real and has a name: anabolic resistance. It has been described in review articles and partly explains why older adults need more protein. The precise figures of 30 to 50 percent at exactly 10 grams come from small mechanistic studies using muscle biopsies, often involving only a handful of participants. The direction is correct; the sharpness of the numbers is not.

Correct. Nano-hydroxyapatite is the same mineral that makes up your enamel, and it fills in early demineralization. In comparative research, it performs as well as fluoride against incipient cavities. In Japan, it has been used this way for decades.

This is correct as stated, because the claim speaks of an association rather than causation. Poor oral health is linked to cardiovascular disease, elevated inflammatory markers in the blood and cognitive decline. Whether it is also a cause has not been established: people with severe gum disease also differ in other respects. Serious research is ongoing into a gum bacterium that has been found in brain tissue, but that pathway has not been proven.