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Is there really a level at which alcohol benefits cognition?

A very large study of adults aged 40-73 found evidence that alcohol's suggested benefit for cognition applies to a much lower level of alcohol consumption than previously claimed — only one drink a day.
Another longitudinal study that also removed the bias that's thought to come from including non-drinkers in the analysis, found no evidence for any cognitive benefits at any level of alcohol consumption.

Large study shows level of beneficial alcohol consumption much lower than thought

Belly fat in older adults linked with cognitive impairment

A large Irish study found that belly fat was linked to poorer cognition in older adults, while BMI was not, probably because it doesn't distinguish between muscle and fat.

Data from over 5,000 individuals found that a measure of belly fat (waist:hip ratio) was associated with reduced cognitive function in older Irish adults (60+). Body mass index (BMI), however, was found to protect cognitive function.

Nutrients linked to better brain connectivity, cognition in older adults

A study found that higher levels of several key nutrients were associated with more efficient brain connectivity and better cognitive performance in older adults.

A study involving 116 healthy older adults (65-75) has found that higher levels of several key nutrients in the blood were associated with more efficient brain connectivity and better cognitive performance.

Older people less apt to recognize they've made a mistake

A small study has found that older adults (average age 68) are less able to recognize when they made errors.

A small study comparing 38 younger adults (average age 22) and 39 older adults (average age 68) found that the older adults were less able to recognize when they made errors.

Does mental stimulation help fight age-related cognitive decline?

A large study found that mentally stimulating activities in mid-life and later were linked to a lower risk or delay of MCI.
A very large study found that the more regularly older adults played puzzles such as crosswords and Sudoku, the better they performed on tasks assessing attention, reasoning and memory.
A review of 32 studies has concluded that mind-body exercises such as tai chi do help improve cognition in older adults.

Can computer use, crafts and games slow or prevent age-related memory loss?

Education & IQ linked to later cognitive decline & dementia

A large, long-running study found those with a college education maintained good cognition substantially longer than those who didn't complete high school.
A very large online study found that higher levels of education were strong predictors of better cognitive performance across all ages (15-60 years), but this was more true for types of cognition such as reasoning and less true for processing speed.
A large study of older men found that their cognitive ability at age 20 was a stronger predictor of cognitive function later in life than other factors, such as higher education, occupational complexity or engaging in late-life intellectual activities.

Americans with a college education live longer without dementia and Alzheimer's

Low social engagement linked to cognitive decline & dementia risk

A very large, very long-running British study found that higher social contact at age 60 was associated with a significantly lower risk of developing dementia.
A 3-year study of older adults found that lower social engagement was only associated with greater cognitive decline in those with higher amyloid-beta levels.

Socially active 60-year-olds face lower dementia risk

Stress in midlife affects cognitive decline later in life

A large long-running study found that stressful life experiences (but not traumatic events) during middle-age were associated with greater memory decline in later life — but only for women.
A large long-running study found that middle-aged adults with higher levels of the stress hormone cortisol had poorer cognition than those with average cortisol levels, and this was also associated with greater brain atrophy.
A study found that older adults (65-95) who responded to stressful events with more negative emotions showed greater fluctuations in cognitive performance.

Stressors in middle age linked to cognitive decline in older women

Data from some 900 older adults has linked stressful life experiences among middle-aged women, but not men, to greater memory decline in later life.

Visual impairment associated with a decline in cognitive function

A large study indicates that visual impairment can play a role in age-related cognitive decline.

A study involving more than 2,500 older adults (65+) found that the rate of worsening vision was associated with the rate of cognitive decline. More importantly, vision has a stronger influence on cognition than the reverse.

Hearing loss linked to increased cognitive decline & dementia risk

A very large Taiwanese study found that adults with hearing loss had a higher dementia risk, and this was particularly so for those aged 45-64.
A very large Japanese study found that a dramatically greater proportion of older adults (65+) with hearing loss reported memory loss, compared to much fewer of those without hearing loss.
A very large study found that older adults (50+) who used hearing aids for hearing loss showed better performance on tests of working memory and attention compared with those who didn't use hearing aids for their hearing loss.
A large long-running study found that, while hearing impairment was associated with accelerated cognitive decline in older adults (mean age 73.5), the impact might be lessened by higher education.
A very large 8-year study found that hearing loss was associated with higher risk of subjective cognitive decline in older men (62+).
A very small study suggests that cognitive problems in some older adults may derive directly from hearing impairments, and may be fixed by addressing this.
A large, long-running study found that eating a healthy diet was associated with a lower risk of acquired hearing loss in women.

Hearing loss linked to increased dementia risk

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