Max Lugavere

This association comes almost entirely from Japanese population research, where cheese plays a very different role in the diet than it does here. It is a single observation in a single population, never replicated in a trial. There is currently no basis on which to ground any advice about cheese and dementia.

There is indeed a recent study that found this association, in a group of older adults followed over many years. It is an observation, not an experiment: people who eat an egg a day probably have breakfast more often and differently from those who do not. Interesting as a pointer, but too early to serve as a recommendation.

That study does exist, which is more than can be said for most supplement claims. However, it was a small, open-label pilot lasting just a few weeks and without a control group, designed to find out whether creatine can reach the brain at all. It can. On the basis of such a design, nothing can be concluded about 'significant improvements' in Alzheimer's disease; a randomised trial is needed for that, and one is currently under way.

The first part is correct: juice delivers the same sugar without the fibre and the chewing time, and fructose demonstrably raises uric acid levels. The leap to damage to your cellular power plants is a hypothesis put forward by a single research group. Plausible, but not demonstrated in humans.

As regards blood sugar regulation, this is correct and well demonstrated: after just one night of short sleep, the body's response to insulin is measurably impaired. The picture for cortisol is mixed, and inflammatory markers do rise but only modestly and briefly. The combined effect is presented here more forcefully than the research warrants.

These figures come from population research comparing eating patterns with who later develops dementia. Such associations have genuinely been found, but they do not prove causation: people who eat a lot of ultra-processed food also differ in education, physical activity, smoking and income, all of which are risk factors in their own right. The precision of 13 percent per serving suggests a degree of certainty that this type of research cannot provide.

That percentage comes from research without a control group: series of treated patients whose progress was tracked, without any comparison with people who did not receive the approach. In dementia, that is a fatal flaw, because the course of the disease varies greatly from person to person and from period to period. A small randomised study into an intensive lifestyle programme for early Alzheimer's has since been conducted, and after twenty weeks it found a modest difference on a few tests. That is not the same as stopping decline in seven out of ten people. Lifestyle matters, especially before diagnosis; as a treatment for existing Alzheimer's, this claim is not supported by the evidence, and the hope it raises is considerable.

Repeated facial expressions are indeed widely regarded as contributing to the formation of wrinkles, but a direct clinical study demonstrating this is still lacking. Moreover, available research does not point to collagen breakdown as the specific mechanism: the claim is more precise on this point than the evidence allows. Of all factors, exposure to sunlight is the most strongly supported cause of facial ageing, and its role is greater than that of facial movements.

The general direction is correct: UV radiation is by far the largest cause of visible skin ageing, and multiple sources confirm that most photoageing is caused by the sun. However, the precise figure of 90 percent cannot be substantiated on the basis of available research. Furthermore, other factors such as smoking, air pollution and sleep play a demonstrable role, which makes an absolute figure even more uncertain.

The idea that sun damage accumulates and only becomes visible later is consistent with what research shows: UV damage outpaces repair, and the biological age of skin can measurably increase through years of exposure. The general direction of the claim is therefore correct. However, the specific figure of 20 to 30 years cannot be substantiated on the basis of available research, and the claim that damage necessarily remains hidden for that long also oversimplifies the picture: some signs of sun damage, such as a drier skin barrier or pigmentation spots, can appear much earlier.

UV radiation demonstrably causes skin cancer, and the evidence for this is strong. That UVA rays penetrate deep into the skin and break down collagen fits with the known mechanism of photoaging, but our sources do not specifically confirm that particular role of UVA in detail. The available evidence concerns UV radiation in general, not separately the depth of UVA versus UVB penetration or the collagen breakdown pathway as a route to cancer. The direction of the claim is correct, then, but the precise distinction cannot be firmly established based on what the research here shows.

The causal link between alcohol and cancer has been established for several types of cancer, including breast cancer, and applies even at low daily amounts. There is no proven safe threshold: even at one drink per day, there is a measurably higher risk of cancers including breast and colorectal cancer. The claim reflects this correctly.

Research shows that an intensive lifestyle programme is more effective than metformin in the short term, particularly for weight loss in people at increased risk of type 2 diabetes. In the long term, however, the difference is less clear: weight loss with metformin actually proves more stable. The claim therefore holds for the short term, but goes too far when applied to all time horizons and all outcome measures.

There is a connection between muscle health and brain health, but the link is less direct than the claim suggests. Weak muscles are associated with cognitive decline, and exercise demonstrably improves memory and planning skills. However, that relationship runs largely through physical exercise itself, not purely through the condition of your muscles: it is the act of training that benefits the brain, not simply having healthy muscles. A "direct link" between muscle health and brain health is therefore a stronger claim than the evidence justifies.

Even at an advanced age, including in your eighties and nineties, you can build muscle strength and muscle mass through strength training. The evidence for this is strong and consistent: muscle strength, mobility, and the ability to perform daily tasks independently all improve demonstrably, and even a low training volume already yields results. Two to three training days per week with progressive resistance is the best-supported approach, complemented by adequate protein intake.

Research shows that spermidine is one of the best-supported candidates for stimulating autophagy, and that it occurs naturally in food and in your body. The claim that it 'activates' autophagy is correct in terms of direction, but the role of spermidine as an intermediate step has not yet been fully demonstrated in large human studies. Whether specific foods such as wheat germ and cheese measurably increase autophagy in the human body via spermidine is therefore also not yet firmly established.

Research does indeed show a link between accelerated brain aging and a higher risk of neurodegenerative diseases such as Alzheimer's. Observational studies indicate, for example, that a biologically older brain more than triples the risk of Alzheimer's. However, the specific figure of an 80% higher risk cannot be found in the available research, and the claim suggests more certainty than current science supports.

Research does indeed show that people differ greatly in how their organs age, and that in some individuals one organ stands out clearly. One source even mentions 'nearly one in five people' in that context, which supports the direction of the claim. However, that figure comes from observational research and the precise threshold of 'significantly faster' is not sharply defined, so the claim is somewhat more categorical than the evidence warrants.

Research shows that chronic stress causes measurable damage in brain regions important for memory, and that prolonged stress accelerates biological ageing through multiple mechanisms. The idea that stress can contribute to structural changes in the brain is biologically plausible and supported by animal studies. However, the word "shrink" goes a step further than what the evidence in humans can confirm with certainty: the effects on brain volume in humans have been demonstrated primarily through associations and have not yet been conclusively proven to be causal. The direction of the claim is therefore correct, but the phrasing is more categorical than the current evidence warrants.

Research shows that combining exercise, mental stimulation and social engagement is associated with a lower risk of cognitive decline and dementia. The FINGER and POINTER studies demonstrate that such combined programmes have a measurable effect on brain health. However, the available research says nothing conclusive about racket sports specifically extending lifespan, and the contribution of the social component to brain health has not yet been isolated. The direction of the claim is therefore correct, but the level of certainty is lower than it suggests, and the link to longevity cannot be firmly established.