Answered questions
Brain & memory
128 answered questions · 923 studies
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What does tai chi do for healthy ageing?
Tai chi demonstrably helps older adults reduce falls and improve balance and walking ability. In mild cognitive decline, a…
What are the health benefits of forest bathing?
Walking in the forest regularly measurably reduces anxiety, low mood, and stress. There are positive signals for blood…
Does qigong keep you fit as you get older?
Studies show that qigong helps older people with balance, muscle function, physical ability, and probably also thinking and…
Yes · Moderate evidence
How much do cholinesterase inhibitors help with cognitive decline in Alzheimer's?
In mild to moderate Alzheimer's disease, these medications measurably slow cognitive decline. The benefit is modest: side…
Strong evidence
Is there a treatment in development that prevents Alzheimer's?
There are promising indications that an active lifestyle and treatment of risk factors such as high blood pressure and…
Does Alzheimer's begin decades before diagnosis?
Yes, the biological changes in Alzheimer's disease begin on average roughly twenty years before diagnosis, but symptoms appear…
What does creatine do in your body besides building muscle?
Creatine does more in the brain than in the muscles: it buffers energy and protects the brain against stress such as sleep…
Can you reduce the risk of Parkinson's disease?
Regular physical activity is the best lifestyle choice for reducing your risk of Parkinson's disease: more exercise is…
Yes · Moderate evidence
Does a lithium deficiency increase the risk of dementia?
People in areas with higher lithium levels in drinking water develop dementia less often, but whether a deficiency actually…
Preliminary evidence
What does an omega-3 deficiency do to your brain and mental resilience?
An omega-3 deficiency demonstrably harms the brain, especially during early development and in depression. If you have…
Can GLP-1 agonists reduce cravings for alcohol and nicotine?
There are serious indications that GLP-1 agonists such as semaglutide can curb cravings for alcohol and nicotine, but clinical…
Preliminary evidence
Do GLP-1 agonists have a neuroregenerative effect on nerve cells?
GLP-1 agonists show strong indications of protective and restorative effects on nerve cells in animal research, but results in…
Do GLP-1 medications cause suicidal thoughts?
The available research gives no indication that GLP-1 medications cause suicidal thoughts; several large studies actually…
No · Moderate evidence
What is the effect of Ozempic combined with alcohol use?
Semaglutide reduces the craving for alcohol and the number of heavy drinking episodes in people with an alcohol use disorder.…
What are the causes of memory loss?
Memory loss has many possible causes that differ greatly from one another. If you suddenly develop memory problems, always…
How do you train your memory effectively?
Memory can be trained, but the smartest investment is regular exercise: that has the strongest and broadest support for…
Moderate evidence
Does a daily multivitamin protect memory in older age?
A daily multivitamin appears to offer modest memory protection in older people who are at risk of nutritional shortfalls or…
Moderate evidence
Does talking in your sleep say anything about dementia?
This type of sleep talking is a serious early warning sign for Lewy body dementia and Parkinson's disease. Does your partner…
Does Ozempic change your brain?
Ozempic demonstrably changes how your brain responds to food and hunger, which is the core driver of the weight loss. Whether…
What do immune cells in your brain do during ageing?
Microglia play an active role in brain ageing through fat build-up and energy shortage, but most of the evidence still comes…
What does taurine do in your body?
Taurine has demonstrable functions in the retina, the heart and the brain, and its importance for infants is well-established…
What role do hormones play in mental health complaints?
Hormones, and cortisol in particular, play a demonstrable role in mental health complaints in a proportion of patients, but…
Moderate evidence
What does psilocybin do to your brain health?
Psilocybin shows promising effects on the brain and mood in supervised settings, but the research is still limited and…
What are the differences between ibogaine and psilocybin as treatments?
Psilocybin has more supporting evidence and is safer than ibogaine. Ibogaine carries a real risk of serious, potentially fatal…
What does ibogaine do and what is it used for?
Research shows that ibogaine reduces drug craving and withdrawal symptoms. The heart risks are serious and well documented, so…
Do white spots on the brain increase the risk of dementia?
Pronounced white spots on a brain scan demonstrably increase the risk of dementia, but not every spot is equally concerning.…
Strong evidence
Is there a link between oral bacteria and the development of Alzheimer's disease?
There is a consistent association between oral bacteria and Alzheimer's disease, but a proven cause-and-effect relationship in…
What does research say about the relationship between lithium and memory?
Lithium slows cognitive decline in mild memory problems and early Alzheimer's disease, but for healthy people or as a…
Which lifestyle habits protect your brain health over the long term?
Cognitive activities, a plant-based dietary pattern, and regular exercise, preferably in combination, offer the best-supported…
Moderate evidence
Do ketone drinks do anything for your brain or performance?
For people with memory complaints the early signals are cautiously positive, but the studies are small and not conclusive. As…
Preliminary evidence
Does hearing loss increase your risk of dementia, and does a hearing aid help?
Hearing loss demonstrably increases the risk of dementia, and a hearing aid appears to help, but proven protection for…
Moderate evidence
What does air pollution do to your brain in the long term?
Long-term exposure to air pollution, and fine particulate matter in particular, is associated with an increased risk of…
How much ashwagandha do you need per day?
Research points to 300-600 mg per day as the effective range for stress, anxiety and athletic performance, but the quality of…
Moderate evidence
How many cups of green tea do you need per day?
Two to three cups of green tea per day is the amount at which research shows the most health benefits, though cause and effect…
Moderate evidence
What does creatine do for people over sixty?
Creatine has reasonably well-supported benefits for people over sixty in the areas of muscle strength, muscle mass and memory,…
Why does your memory work less well as you get older?
Memory loss with ageing is a normal biological process with multiple clearly demonstrated causes, but you can slow it down:…
Does learning a new language help keep your brain healthy?
Actively using two languages throughout your life is associated with a lower risk of dementia and a brain that continues to…
Moderate evidence
Can you prevent dementia through your lifestyle?
Lifestyle does meaningfully influence your dementia risk: one third of all cases are linked to modifiable factors such as…
Yes · Moderate evidence
What keeps your memory sharp in later life?
Getting good sleep, eating mindfully according to the MIND diet and engaging in targeted cognitive training have the strongest…
Moderate evidence
Does ergothioneine work as a longevity supplement?
Ergothioneine shows a positive signal in a small study of older adults with memory complaints, but it is too early for firm…
Preliminary evidence
Does years of insufficient sleep damage your brain?
Years of insufficient sleep damages the brain through multiple pathways at once, and some of that damage appears difficult or…
Does a low dose of lithium help protect the ageing brain?
There are preliminary indications that low doses of lithium may offer brain protection, but the evidence is still too thin and…
Preliminary evidence
Does lion's mane really work for your brain?
Lion's mane shows cautiously positive signals for attention and working memory in small studies, but the evidence is still too…
Preliminary evidence
Does methylene blue really work for energy and brain function?
Do not take this as a supplement. Methylene blue is a registered medicine, not a dietary supplement, and is not permitted as…
Preliminary evidence
Does the Wim Hof method actually work?
There are signs that the method can dampen the body's inflammatory response, but the studies are small, and for stress, mood,…
Preliminary evidence
Is magnesium L-threonate better for your brain?
MgT has preliminary indications that it raises brain magnesium more effectively and may support cognition, but the human…
Preliminary evidence
Is there a relationship between changing body odour and Alzheimer's disease?
Loss of smell is a well-documented early sign of Alzheimer's disease, and changes in body odour are being investigated as a…
How do I know whether my mood swings are hormonal or something else?
The cyclical pattern of your symptoms is the best distinguishing factor: if they occur only in the two weeks before your…
Can Magnetic Resonance Spectroscopy (MRS) detect Alzheimer's disease early?
MRS can signal brain abnormalities in early Alzheimer's disease, but is not yet ready for use as a standalone diagnostic tool.…
Moderate evidence
Can your gut microbiome affect your memory and concentration?
Your gut microbiome can influence your memory and concentration through several routes, but most of the evidence still comes…
Do I sleep worse if I am often alone or feel lonely?
Yes, loneliness is clearly associated with poorer sleep: you have more difficulty falling asleep, wake up more often during…
Why do women experience anxiety symptoms after menopause?
Fluctuating oestrogen levels disrupt brain systems that regulate anxiety and mood, causing some women to experience anxiety…
Does your biological age advance more quickly when you are lonely?
Loneliness is associated with measurably faster biological ageing, and that association has been found across multiple…
Is there a link between hormones and the risk of dementia?
There is solid evidence that thyroid hormones, sex hormones and stress hormones all play a role in dementia risk. The evidence…
What does fine particulate matter do to your memory in the long run?
Poor air quality, especially fine particulate matter, is consistently associated with worse cognitive performance and possibly…
What is the relationship between your thyroid and depressive symptoms?
There is a clear association between thyroid problems and depressive symptoms, although the precise direction of influence has…
Does regular sauna use protect your brain against decline?
People who used a sauna four to seven times a week developed dementia considerably less often in long-running research than…
Moderate evidence
Does watching a lot of television affect your brain?
Watching more than 3.5 hours of television per day is associated with faster memory decline in people aged 50 and over,…
Yes · Moderate evidence
Why do damaged proteins build up inside your cells?
Cells have two clean-up systems for damaged proteins: the proteasome and autophagy. Both become less effective with age, and…
Do older people get less deep sleep?
Older people demonstrably get less deep sleep, and this is associated with higher risks of dementia and lower growth hormone…
Yes · Strong evidence
What does high cholesterol do to your brain as you age?
High cholesterol in middle age likely increases the risk of dementia, but at older ages the relationship is less clear and…
Can thyroid problems worsen your memory and concentration?
A clearly underactive or overactive thyroid can noticeably affect your memory, concentration and mood. With mild thyroid…
Yes · Moderate evidence
What does alcohol do to your cells and DNA in the long run?
Chronic alcohol use damages your DNA, disrupts how genes are read and increases the risk of several types of cancer. Drinking…
Does drinking coffee really help against dementia, or is that a myth?
Drinking 2 to 3 cups of caffeinated coffee daily is associated with a lower dementia risk in several large studies, but this…
Moderate evidence
What does loneliness do to your immune system?
Loneliness disrupts your immune system in multiple ways simultaneously: more inflammation, reduced antiviral defence, and…
Do you sleep worse when you are stressed?
Stress worsens your sleep, and poor sleep raises your stress levels: that cycle is well documented. Anyone who notices that…
Yes · Moderate evidence
What does long-term loneliness do to your brain?
Prolonged loneliness is associated with a higher risk of dementia and persistent low mood, and damages the stress system.…
Does heavy mobile phone use increase the risk of brain tumours?
With normal use, the research shows no increased risk of brain tumours; with more than ten years of use there are weak…
No · Moderate evidence
Is reading every day good for your brain in the long run?
Daily reading is associated with a lower risk of dementia and greater cognitive resilience in later life. Whether reading…
Yes · Moderate evidence
What are the signs that your gut flora is out of balance?
There are several recognisable signals, of which abdominal complaints such as persistent pain, diarrhoea, or constipation are…
Do your brains really shrink as you get older?
Your brain does indeed shrink with age, particularly in areas involved in memory and planning. High blood pressure accelerates…
What does a vitamin D deficiency do to your brain?
A vitamin D deficiency is associated with a higher risk of cognitive decline and dementia, but whether correcting it with…
Why are cells damaged when you don't get enough oxygen?
Oxygen deprivation damages cells through a chain of mechanisms: energy deficit, overstimulation of nerve cells, and an assault…
Do you age faster if you sleep too little?
Sleep deprivation demonstrably disrupts the processes that keep the brain young, particularly the clearance of harmful…
Does green tea help improve your memory or concentration?
Green tea offers a modest but real benefit for concentration and working memory in healthy people, owing mainly to the…
Yes · Moderate evidence
Does type 2 diabetes increase your risk of dementia?
Type 2 diabetes substantially increases the risk of dementia, and the younger you are at diagnosis, the greater that risk.…
Does getting more sleep improve my memory?
Sufficient sleep demonstrably benefits your memory: your brain processes and stores new information while you sleep. Too…
Yes · Strong evidence
What exactly is brain fog and where does it come from?
Brain fog most likely has multiple simultaneous causes, of which a leaking blood-brain barrier in long COVID is the best…
What is the difference between REM sleep and deep sleep?
You need both sleep stages: deep sleep and REM sleep each do something different for your memory and brain, and getting a full…
Moderate evidence
Is there a link between depression and a higher risk of dementia?
Depression is strongly associated with a higher risk of dementia, though it remains uncertain whether depression causes…
Does fasting or eating less help your memory and concentration?
Eating less or intermittent fasting probably shows a small positive effect on memory and concentration. The evidence is there,…
Yes · Moderate evidence
Is irritable bowel syndrome a real condition, or is it all in your head?
Irritable bowel syndrome is not all in your head: researchers measure real physical abnormalities in the gut. Psychological…
What does excess weight do to your brain in the long run?
Excess weight harms your brain in multiple ways at once: less brain tissue, weaker connections and a higher risk of dementia.…
What does your estrogen level do to your memory and concentration?
Oestrogen has a measurable influence on memory and concentration, and the decline during perimenopause is accompanied by…
Can stress really make your gut sick?
Stress can really make your gut sick, from abdominal pain and unpredictable bowel movements to stomach complaints. If you have…
Can high blood pressure in your 40s cause dementia later in life?
High blood pressure in your forties demonstrably increases your risk of dementia later in life, and early treatment appears to…
Does olive oil protect your brain from decline?
Extra virgin olive oil as part of the Mediterranean diet has been linked to less cognitive decline in multiple studies, but…
Yes · Moderate evidence
What does smoking do to your brain as you age?
Smoking accelerates brain ageing and increases the risk of dementia. Quitting smoking is one of the best-supported steps you…
Does your brain age faster than the rest of your body?
Whether your brain ages faster than the rest of your body varies from person to person, but the consequences are significant:…
Why do I dream so much, and is that good or bad?
Simply dreaming a lot is normal and need not be a cause for concern. However, persistent nightmares or dreams that you…
Moderate evidence
Is it bad for your brain if you don't get enough exercise for years on end?
Years of too little exercise is associated with a clearly elevated risk of memory problems and dementia. Moving more, even…
Yes · Moderate evidence
What does chronic stress do to your cortisol in the long term?
Chronic stress noticeably dysregulates your cortisol system: your daily rhythm flattens, your immune function, sleep and…
What does caffeine do to your memory and concentration in the long run?
Caffeine helps you stay more alert and focused when you are tired, but it does not make a well-rested brain smarter. If you…
Does metformin lower your risk of cancer or dementia?
People with diabetes who take metformin may develop cancer and dementia less often, but the evidence is mixed and does not…
Preliminary evidence
What does NAD+ do for your brain?
NAD+ matters for your brain and declines with age. Whether topping it up via NMN (a substance your body converts into NAD+) or…
Does creatine affect dopamine levels?
In healthy people, creatine has no demonstrable effect on dopamine in the blood. Positive signals so far come exclusively from…
How does creatine improve mood and wellbeing?
Small studies occasionally show positive signals in depression, but an international guideline based on many studies concludes…
Does creatine supplementation reduce brain fog?
Creatine may ease cognitive complaints, but the effect depends heavily on your situation: people with chronic fatigue, sleep…
Moderate evidence
Does gratitude or optimism help your health and longevity?
Greater optimism is linked, across several large, long-running studies, to a considerably lower risk of dying from heart and…
Yes · Moderate evidence
Does creatine also help with memory and concentration?
Creatine can improve your memory, but mainly if you are older, vegetarian, or your brain is under pressure. If you are a…
Yes · Moderate evidence
Can you make up for sleep debt by sleeping in on the weekend?
Sleeping in on the weekend helps briefly but does not resolve chronic sleep debt. If you want to limit the downsides, keep…
Moderate evidence
Does my sleep change as I get older, and is that normal?
Sleep changes in predictable ways as you age, and much of that is normal. Take notice if your sleep deteriorates…
Yes · Strong evidence
What does alcohol do to your brain in the long term?
Long-term heavy drinking demonstrably damages the brain, in part irreversibly. Stopping helps, but after years of heavy use it…
What does long-term stress do to your memory?
Long-term stress harms memory through measurable changes in the brain, and early-life stress raises the risk of memory…
Does the MIND diet help against dementia and cognitive decline?
Large studies in people link the MIND diet to a lower chance of dementia, but the only large study in which people were…
Moderate evidence
Does mentally challenging work protect against dementia?
Studies following people for years consistently show that mental challenge lowers the risk of dementia, but this is an…
Yes · Moderate evidence
Can you still reverse early-stage forgetfulness with your lifestyle?
Lifestyle can probably slow early-stage forgetfulness and sometimes partially improve it, but full reversal has not been…
Moderate evidence
Does heading in football increase your risk of dementia?
Professional footballers who head the ball frequently have a considerably higher risk of dementia than goalkeepers or people…
Yes · Moderate evidence
Is forgetting names around 50 normal?
Forgetting names around age 50 is normal and biologically explainable. It is not a reason for immediate concern, but exercise…
Yes · Moderate evidence
Can you tell someone's biological age from their face?
Your face does emit biological signals, but it is too limited and too variable to measure your biological age accurately. Take…
Is there a link between your gut microbiome and your mood?
There is a biologically plausible and, in animal research, robustly supported connection between your gut microbiome and your…
Do B vitamins (folate, B6) benefit your heart and brain?
Folate reduces stroke risk by around 16%, but most likely only when there is a deficiency. For broader cardiovascular risk and…
Moderate evidence
Does exercise really help with depression and anxiety?
Yes, exercise genuinely works: for mild to moderate depression it is as effective as medication, for anxiety disorders it is…
Yes · Strong evidence
Do brain-training games help prevent cognitive decline?
Cognitive training has a demonstrable, albeit modest, benefit for people with Alzheimer's disease or mild dementia, but does…
Moderate evidence
Can I test my risk of Alzheimer's with a blood test (p-tau217)?
A blood test for p-tau217 shows promising results as an early signal for Alzheimer's, but is not yet available as a routine…
Moderate evidence
Does poor sleep cause dementia sooner?
Poor sleep probably increases your risk of dementia, but ordinary insomnia does not make dementia inevitable. One exception:…
Yes · Moderate evidence
When should I be concerned about memory problems?
Not every instance of memory loss is worrying, but certain signs deserve prompt medical attention: sudden deterioration, the…
Moderate evidence
How do you keep your brain healthy as you age?
Combining more physical activity with staying mentally active and eating a diet low in sugar and higher in omega-3 fatty acids…
Moderate evidence
Which blood values should I have checked to age healthily?
Blood sugar, blood fats, and inflammation markers are best supported by the evidence if you want to age healthily. Alzheimer's…
Preliminary evidence
How healthy are blueberries and other red/blue fruits for your brain?
Eating blueberries daily has a modest but consistent positive effect on memory and vascular health, particularly if you are…
Does a second language or music help protect the brain against ageing?
Speaking two or more languages daily appears to protect the brain in later life, with the strongest evidence for people who…
Yes · Moderate evidence
Does staying socially active and physically active protect against dementia?
Staying socially and physically active is probably your best lifestyle investment against dementia. The strongest results come…
Yes · Moderate evidence
Does exercise keep my brain sharp?
Regular exercise demonstrably keeps your brain sharper, as long as serious cognitive decline has not yet set in. The…
Yes · Strong evidence
Does poor hearing increase my risk of dementia?
Poor hearing is associated with a modest but real increased risk of dementia. Have hearing loss assessed and treated in good…
Does deep sleep flush waste products from your brain?
Yes, your brain cleanses itself largely during sleep, and deep sleep appears to play the most important role in this.…
Do fish oil pills keep my memory sharp?
Fish oil may make a modest contribution to attention and memory, but the evidence is not strong enough to recommend a pill…
Moderate evidence
What can I concretely do to prevent dementia?
Various lifestyle choices demonstrably lower your risk, but no single approach guarantees that you will prevent dementia.…
Moderate evidence
What does APOE4 mean and what can you do about it?
APOE4 substantially increases your risk of Alzheimer's disease, but at younger ages lifestyle factors such as blood pressure,…
Moderate evidence