How does the brain store information?
Information is stored in different parts of your memory. Information stored in recent memory may include what you ate for breakfast this morning. Information stored in the short-term memory may include the name of a person you met moments ago. Information stored in the remote or long-term memory includes things that you stored in your memory years ago, such as memories of childhood.
How does ageing change the brain?
When you're in your 20s, you begin to lose brain cells a few at a time. Your body also starts to make less of the chemicals your brain cells need to work. The older you are, the more these changes can affect your memory.
Ageing may affect memory by changing the way the brain stores information and by making it harder to recall stored information.
Your short-term and remote memories aren't usually affected by ageing. But your recent memory may be affected. For example, you may forget the names of people you've met today or where you set your keys. These are normal changes.
What about when I know a word but can't recall it?
This is usually just a glitch in your memory. You'll almost always remember the word with time. This may become more common as you age. It can be very frustrating, but it's not usually serious.
Things to help you remember
- Keep lists.
- Follow a routine.
- Make associations (connect things in your mind), such as using landmarks to help you find places.
- Keep a detailed calendar.
- Put important items, such as your keys, in the same place every time.
- Repeat names when you meet new people.
- Do things that keep your mind and body busy.
- Run through the ABC's in your head to help you think of words you're having trouble remembering. "Hearing" the first letter of a word may jog your memory.
What are some other causes of memory problems?
Many things other than ageing alone can cause memory problems. These include depression, dementia (severe problems with memory and thinking, such as Alzheimer's disease), side effects of drugs, strokes, head injury and alcoholism.
How does Alzheimer's disease change memory?
Alzheimer's disease starts by changing the recent memory. At first, a person who has Alzheimer's disease will remember even small details of his or her distant past but not be able to remember recent events or conversations. Over time, the disease affects all parts of the memory.
How can I tell if my memory problems are serious?
A memory problem is serious when it affects your daily living. If you sometimes forget names, you're probably okay. But you may have a more serious problem if you have trouble remembering how to do things you've done many times before, get to a place you've been to often, or do things that require steps (such as following a recipe).
Another difference between normal memory problems and dementia is that normal memory loss doesn't get much worse over time. Dementia gets much worse over several months to several years.
It may be hard to figure out on your own if you have a serious problem. Talk to your family doctor about any concerns you have. If your memory problems are caused by a certain medicine you're taking, your doctor can prescribe another medicine that doesn't have this side effect. If another condition is causing your memory loss (such as depression), your doctor can help you treat the condition.
Memory problems that aren't part of normal aging
- Forgetting things much more often than you used to
- Forgetting how to do things you've done many times before
- Trouble learning new things
- Repeating phrases or stories in the same conversation
- Trouble making choices or handling money
- Not being able to keep track of what happens each day
Symptom Checker: Symptoms & Signs Index
Memory loss, also referred to as amnesia, is an abnormal degree of forgetfulness and/or inability to recall past events. Depending on the cause, memory loss may have either a sudden or gradual onset, and memory loss may be permanent or temporary. Memory loss may be limited to the inability to recall recent events, events from the distant past, or a combination of both. Although the normal ageing process can result in difficulty in learning and retaining new material, normal ageing itself is not a cause of significant memory loss unless there is an accompanying disease that is responsible for the memory loss.
Transient global amnesia is a rare, temporary, complete loss of all memory. Anterograde amnesia refers to the inability to remember recent events in the aftermath of a trauma, but a recollection of events in the distant past is unaltered. Retrograde amnesia is the inability to remember events preceding a trauma, but recall of events afterwards is possible.
Memory loss has multiple causes including a number of chronic medical and psychological conditions, trauma, medications, drug or alcohol abuse, and infections.
Memory Loss and Aging
CAUSES, TREATMENT, AND HELP FOR MEMORY PROBLEMS
Memory and ageing: What’s normal, what’s not
What causes age-related memory loss?
- The hippocampus, a region of the brain involved in the formation and retrieval of memories, often deteriorates with age.
- Growth factors—hormones and proteins that protect and repair brain cells and stimulate neural growth—decline with age.
- Older people often experience decreased blood flow to the brain, which can impair memory and lead to changes in cognitive skills.
- Older people are less efficient at absorbing brain-enhancing nutrients.
Forgetfulness is a common complaint among older adults. You start to talk about a movie you saw recently when you realize you can’t remember the title. You’re giving directions to your house when you suddenly blank on a familiar street name. You find yourself standing in the middle of the kitchen wondering what you went in there for.
Memory lapses can be frustrating, but most of the time they aren’t causing for concern. Age-related memory changes are not the same thing as dementia.
As we grow older, we experience physiological changes that can cause glitches in brain functions we’ve always taken for granted. It takes longer to learn and recall information. We’re not as quick as we used to be. In fact, we often mistake this slowing of our mental processes for true memory loss. But in most cases, if we give ourselves time, the information will come to mind.
Memory loss is not an inevitable part of the ageing process
The brain is capable of producing new brain cells at any age, so significant memory loss is not an inevitable result of ageing. But just as it is with muscle strength, you have to use it or lose it. Your lifestyle, health habits, and daily activities have a huge impact on the health of your brain. Whatever your age, there are many ways you can improve your cognitive skills, prevent memory loss, and protect your grey matter.
Furthermore, many mental abilities are largely unaffected by normal ageing, such as:
- Your ability to do the things you’ve always done and continue to do often
- The wisdom and knowledge you’ve acquired from life experience
- Your innate common sense
- Your ability to form reasonable arguments and judgments
Normal forgetfulness vs. dementia
For most people, occasional lapses in memory are a normal part of the ageing process, not a warning sign of serious mental deterioration or the onset of dementia.
Normal age-related forgetfulness
The following types of memory lapses are normal among older adults and generally are not considered warning signs of dementia:
- Forgetting where you left things you use regularly, such as glasses or keys.
- Forgetting names of acquaintances or blocking one memory with a similar one, such as calling a grandson by your son’s name.
- Occasionally forgetting an appointment.
- Having trouble remembering what you’ve just read, or the details of a conversation.
- Walking into a room and forgetting why you entered.
- Becoming easily distracted.
- Not quite being able to retrieve the information you have “on the tip of your tongue.”
Does your memory loss affect your ability to function?
The primary difference between age-related memory loss and dementia is that the former isn’t disabling. The memory lapses have little impact on your daily performance and ability to do what you want to do.
When memory loss becomes so pervasive and severe that it disrupts your work, hobbies, social activities, and family relationships, you may be experiencing the warning signs of Alzheimer’s disease, or another disorder that causes dementia, or a condition that mimics dementia.
Normal age-related memory changes
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Symptoms that may indicate dementia
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Able to function independently and pursue normal activities, despite occasional memory lapses
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Difficulty performing simple tasks (paying bills, dressing appropriately, washing up); forgetting how to do things you’ve done many times
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Able to recall and describe incidents of forgetfulness
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Unable to recall or describe specific instances where memory loss caused problems
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May pause to remember directions, but doesn’t get lost in familiar places
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Gets lost or disoriented even in familiar places; unable to follow directions
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Occasional difficulty finding the right word, but no trouble holding a conversation
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Words are frequently forgotten, misused, or garbled; Repeats phrases and stories in the same conversation
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Judgment and decision-making ability are the same as always
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Trouble making choices; May show poor judgment or behave in socially inappropriate ways
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Reversible causes of memory loss
It’s important to be aware of ways that your health, environment, and lifestyle may contribute to memory loss. Sometimes, even what looks like significant memory loss can be caused by treatable conditions and reversible external factors.
- Side effects of medication. Many prescribed and over-the-counter drugs or combinations of drugs can cause cognitive problems and memory loss as a side effect. This is especially common in older adults because they break down and absorb medication more slowly. Common medications that affect memory and brain function include sleeping pills, antihistamines, blood pressure and arthritis medication, antidepressants, anti-anxiety meds, and painkillers.
- Depression. Depression can mimic the signs of memory loss, making it hard for you to concentrate, stay organized, remember things, and get stuff done. Depression is a common problem in older adults—especially if you’re less social and active than you used to be or you’ve recently experienced a number of important losses or major life changes (retirement, a serious medical diagnosis, the loss of a loved one, moving out of your home).
- Vitamin B12 deficiency. Vitamin B12 protects neurons and is vital to healthy brain functioning. In fact, a lack of B12 can cause permanent damage to the brain. Older people have a slower nutritional absorption rate, which can make it difficult for you to get the B12 your mind and body need. If you smoke or drink, you may be at particular risk. If you address a vitamin B12 deficiency early, you can reverse the associated memory problems. Treatment is available in the form of a monthly injection.
- Thyroid problems. The thyroid gland controls metabolism: if your metabolism is too fast, you may feel confused, and if it’s too slow, you can feel sluggish and depressed. Thyroid problems can cause memory problems such as forgetfulness and difficulty concentrating. Medication can reverse the symptoms.
- Alcohol abuse. Excessive alcohol intake is toxic to brain cells, and alcohol abuse leads to memory loss. Over time, alcohol abuse may also increase the risk of dementia. Because of the damaging effects of excessive drinking, experts advise limiting your daily intake to just 1-2 drinks.
- Dehydration. Older adults are particularly susceptible to dehydration. Severe dehydration can cause confusion, drowsiness, memory loss, and other symptoms that look like dementia. It’s important to stay hydrated (aim for 6-8 drinks per day). Be particularly vigilant if you take diuretics or laxatives or suffer from diabetes, high blood sugar, or diarrhoea.
Preventing memory loss and cognitive decline
The same practices that contribute to healthy ageing and physical vitality also contribute to a healthy memory.
- Exercise regularly. Regular exercise boosts brain growth factors and encourages the development of new brain cells. Exercise also reduces the risk for disorders that lead to memory loss, such as diabetes and cardiovascular disease. Exercise also makes a huge difference in managing stress and alleviating anxiety and depression—all of which leads to a healthier brain.
- Stay social. People who don’t have social contact with family and friends are at higher risk for memory problems than people who have strong social ties. Social interaction helps brain function in several ways: it often involves activities that challenge the mind, and it helps ward off stress and depression. So join a book club, reconnect with old friends, or visit the local senior centre. Being with other people will help keep you sharp!
- Eat plenty of fruits, vegetables, and omega-3 fats. Antioxidants, found in abundance in fresh produce, literally keep your brain cells from “rusting.” And foods rich in omega-3 fats (such as salmon, tuna, trout, walnuts, and flaxseed) are particularly good for your brain and memory. Also avoid saturated and trans fats, which helps cholesterol levels and reduces your risk of stroke.
- Manage stress. Cortisol, the stress hormone, damages the brain over time and can lead to memory problems. But even before that happens, stress causes memory difficulties at the moment. When you’re stressed out, you’re more likely to suffer memory lapses and have trouble learning and concentrating.
- Get plenty of sleep. Sleep is necessary for memory consolidation, the process of forming and storing new memories so you can retrieve them later. Sleep deprivation also reduces the growth of new neurons in the hippocampus and causes problems with memory, concentration, and decision-making. It can even lead to depression—another memory killer.
- Don’t smoke. Smoking heightens the risk of vascular disorders that can cause stroke and constrict arteries that deliver oxygen to the brain.
Walking: An easy way to fight memory loss
New research indicates that walking six miles to nine miles every week can prevent brain shrinkage and memory loss. According to the American Academy of Neurology, older adults who walked between 6 and 9 miles per week had more gray matter in their brains nine years after the start of the study than people who didn't walk as much. Researchers say that those who walked the most cut their risk of developing memory loss in half.
Brain exercises to prevent memory loss and boost brainpower
When it comes to memory, it’s “use it or lose it.” Just as physical exercise can make and keep your body stronger, mental exercise can make your brain work better and lower the risk of mental decline.
Here are some ideas for brain exercise, from light workouts to heavy lifting:
- Play games that involve strategies, like chess or bridge, and word games like Scrabble.
- Try crossword and other word puzzles, or number puzzles such as Sudoku.
- Read newspapers, magazines, and books that challenge you.
- Get in the habit of learning new things: games, recipes, driving routes, a musical instrument, a foreign language.
- Take a course in an unfamiliar subject that interests you. The more interested and engaged your brain, the more likely you’ll be to continue learning and the greater the benefits you’ll experience.
- Take on a project that involves design and planning, such as a new garden, a quilt, or a koi pond.
Compensating for memory loss
Even if you are experiencing a troublesome level of memory loss, there are many things you can do to learn new information and retain it.
When to see a doctor for memory loss
It’s time to consult a doctor when memory lapses become frequent enough or sufficiently noticeable to concern you or a family member. If you get to that point, make an appointment to talk with your primary physician and have a thorough physical examination.
The doctor will ask you a lot of questions about your memory, including:
- how long you or others have noticed a problem with your memory
- what kinds of things have been difficult to remember
- whether the difficulty came on gradually or suddenly
- whether you’re having trouble doing ordinary things.
The doctor also will want to know what medications you’re taking, how you’ve been eating and sleeping, whether you’ve been depressed or stressed lately, and other questions about what’s been happening in your life. Chances are the doctor will also ask you or your partner to keep track of your symptoms and check back in a few months.
Further evaluation of memory function
If your memory problem needs more evaluation, your doctor may send you to a neuropsychologist, who will provide you with pencil-and-paper tests that gauge different aspects of mental ability. If those tests show abnormal results, the doctor will try to rule out causes of cognitive dysfunction based on conditions such as vascular disease, psychological problems, eating and drinking habits, and environmental factors.
A problematic showing on mental ability tests means you’ll probably go in for imaging studies of the brain, such as a CT or MRI scan, which can detect anything putting pressure on your brain, and, if that’s normal, a SPECT or PET scan, which track blood flow and metabolic activity in the brain. These are currently the most sensitive tools for revealing brain abnormalities.
If you are diagnosed with mild cognitive impairment or early Alzheimer’s disease, you may benefit from one of the medications that work by protecting acetylcholine, a brain chemical that facilitates memory and learning.
| Alcohol and Memory Loss | |
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Excessive alcohol consumption can lead to blackouts – periods of temporary memory loss or amnesia. Blackouts are common among alcohol abusers and can be a warning sign to drinkers and their friends that alcohol-related problems exist. Blackouts are also considered an early high-risk indicator of alcoholism. For problem and healthy drinkers alike, blackouts are often troubling or traumatic when serious and typically unforgettable occurrences are impossible to remember.
Alcohol has far-reaching effects on many areas of the brain. When you consume alcohol, the body immediately begins to break it down. In the process, breakdown products called ethyl esters speed the movement of positively charged potassium ions from brain cells through the outer membranes, creating a negative charge within the cell. This impairs calcium channels, which brain cells rely upon to communicate with other cells throughout the body. The brain also receives less oxygen when alcohol is present. Alcohol also has a detrimental effect on the central nervous system. The cumulative effect of these changes is that the activity of the hippocampus is disrupted. Moderate doses of alcohol disrupt the acquisition and performance of spatial reference memory tasks and reduce the overall level of glutamate released at synapses within the hippocampus.
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