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How to Prevent or Minimize Cognitive Decline

Here are some things that may help reduce the risk of cognitive decline and Alzheimer’s Disease. It's a long list, but just bear in mind that many of the same things recommended here can also prevent, delay, or minimize the symptoms of diabetes, heart disease, and even cancer:
Increasing digital literacy,
Learning a new language (more here, here, here, here, and here),
Getting enough sleep (more here, here, here, here, here, here, here, here, here, here, here, here, here, and here), especially unfragmented sleep, but not too much (more here).
Minimizing stress (more here, here, here, and here - here's how), including
Socializing (more here, here, here, here, here, here, here, here, here, here, here, and here), especially
Working, especially at a mentally demanding job,
Being engaged in life, including not retiring,
Developing a sense of control over one's life (more here and here)--a sense of efficacy--and a
Positive attitude (more here), especially avoiding cynicism, as well as
Developing spirituality (more here and here), especially by practicing
Meditation (more here and here),
Keeping calorie intake around 2,000 calories per day (more here),
And even fasting some days of the week, and
Eating
A healthy diet (more herehere, and here), especially when combined with exercise, including
Fresh fruits and vegetables (more here, here, here, here, here, and here) especially cruciferous vegetables such as kale and broccoli, and especially blue and purple fruits and vegetables (more here),
Unsaturated fats, especially with omega-3 fatty acids (more here, here, here, here, here, here, here, here, here, and here but then again, maybe not),
Eating fish - at least once a week (more here, here, here, here, here, here, and here, especially salmon),
Or taking a fish oil supplement (more here and here),
Or getting enough omega-3 fatty acids from other sources (more here),
Including olive oil (more here, here, and here),
And nuts (more here and here), especially walnuts,
Especially a Mediterranean style diet (more here, here, here, here, here, here, and here),
Eating more
Berries (more here and here), especially blueberries (more here, here, and here),
Pomegranates, or taking punicalagin, an extract of pomegranates,
Tomatoes (more here).
Eating less
Salt (more here), especially if you’re inactive,
Saturated fats (more here, here, and here).
Using the healing spices
Rosemary (more here),
Turmeric / curcumin (more here, here, here, here, here, here, and here).
Drinking
Alcohol, but moderately (more here and here), and not too much in middle age (more here),
Champagne (more here),
Especially coffee (more here and here, more here and here on caffeine),
And especially green tea (more here),
Or taking green tea extract (more here),
Red wine (more here, here, and here).
Getting enough
Vitamin B (but maybe not), especially vitamin B-12 (more here, here, here, here, and here),
Dietary choline (found in foods like saltwater fish, eggs, liver, chicken, milk and certain legumes, including soy and kidney beans--more here and here),
Vitamin D (more here, here, here, here, here, here, here, and here), especially vitamin D2,
Vitamin E (more here),
Avoiding
Allergy medications and sleep aids containing diphenhydramine;
Iron accumulation in the body (more here),
Smoking (more here, here, here, here, here, here, here, here, and here),
Avoiding or treating
Especially by taking certain blood pressure reducing medications (more here and here),
Cardiovascular disease (more here, here, here, here, here, here, here, here, and here), including
Keeping cholesterol within normal limits (more here, here, here, and here)
Taking a statin drug seems to help prevent cognitive decline, especially if the statin you take doesn't cross the blood-brain barrier),
Diabetes (more here, here, here, here, here, and herehere’s how - but maybe not),
Even prediabetes, especially when combined with depression,
Taking
The anti-depressant Celexa (citalopram),
Fitesin extract,
Fortasyn supplement, which contains uridine-monophosphate, phospholipids, B- vitamins, and antioxidants,
Grape seed extract (more here when combined with a pine cone extract),
Hormone replacement therapy with estrogen or tamoxifen, but not too much estrogen,
Probiotics (more here),
Resveratrol (more here),
A University of South Florida-developed nutritional supplement containing extracts from blueberries and green tea combined with vitamin D3 and amino acids, including carnosine.
Performing routine chores,
Dealing with minor ailments rather than letting them pile up.
Maintaining good vision (more here) and reducing visual clutter.
Practicing dental hygiene (more here) and maintaining chewing ability.
Spending time in green areas.
Using externally applied LED light therapy (which also fights wrinkles, by the way).
Participating in specific treatment programs, such as
MAKS treatment - Motor stimulation, practicing daily living Activities, cognitive stimulation (K), and Spiritual activities,
Or other brain training (more here, here, here, here, and here), such as
Clenching a fist when trying to remember something.
But if all these measures fail, there is still help available.