Are your memory lapses normal or early dementia? Here’s how to know Misplaced your car keys again? Memory lapses can launch us into a panic about what's okay and what's cause for concern.

I’m sitting across from a white-coated woman, struggling to recall whether “apricots” is on a list of random items she’s just read to me. I search for clues in her face, but she stares back blankly, just as she did a few minutes earlier as I attempted to recall what a boy had been eating in a picture she’d shown me. Was it salad? Spaghetti?

A second glimpse reveals that he wasn’t, in fact, eating. Oookaay. This is basically how my morning at a neurologist’s office in New Jersey goes. And by the time the three-hour battery of tests I’ve paid $700 to undergo is finished, I stumble out utterly convinced that I am in the clutches of early-onset Alzheimer’s or that, basically, I’ve become a complete idiot before I’ve even turned 50.

Not that I didn’t already have my suspicions: After increasingly losing track of my cell phone, spacing out on appointments, and forgetting to follow up with friends regarding their recent biopsies, job interviews, and the like, I’d become convinced—actually frantic—that my memory was going and thus scurried off to see a doctor. It’s an anxiety, apparently, that’s hardly limited to myself and several of my 40- and 50-something friends: According to a recent international survey administered by the Harvard School of Public Health, people fear Alzheimer’s second only to cancer.

One in five women who reach the age of 65 will ultimately develop Alzheimer’s, but only 200,000 Americans have early-onset Alzheimer’s, which usually appears around age 40 or 50. And believe it or not, middle-aged adults (in their 40s and 50s) worry more about their memory than people in their 70s and 80s do. “This may be because middle-aged adults tend to live complex lives with a lot of things hanging in the balance. It makes the anticipation of losses now or in the future very scary,” says Constantine Lyketsos, M.D., chair of psychiatry at Johns Hopkins Bayview Medical Center in Baltimore. He adds another, more philosophical observation: “So much of who we are is defined by what we remember. Losing our memories can feel like we are losing ourselves.”

When the results of my tests come in about a week later, I am somewhat surprised by the findings. I scored in the bottom 1 percent on one portion that assessed my attention level. I also didn’t do well on a part that tested “auditory processing.” In other words, I don’t listen very well. Sounds like me in real life. On the other hand, I scored in the top 99th percentile in sections that hinged on language—for example, naming as many items as I could starting with a certain letter. Makes sense—I earn a living as a writer. In the end, the results confirmed what most people close to me suspected: I’m perfectly normal, although I rush a lot and could pay closer attention when people are talking to me. But as I scramble into my car and turn the ignition, my flush of relief is quickly replaced by two unsettling questions: What is normal for a woman my age? And if this is normal, how lame-brained will I be by the time I hit 55? Or 65?

Dealing with midlife distractions

Fielding such questions from nervous Nellies like myself is routine for the experts at New York University (NYU) Langone Medical Center’s Center of Excellence on Brain Aging in New York City. “Five years ago, most of the people who came for testing were older, 70 and up. But as the baby boomer generation enters into its 50s and 60s, we’ve seen an increase in the number of people worried about their memory,” says managing associate director Karyn Marsh. She escorts me through the enormous building, past a warren of labs, clinics, and offices, to sit down with Susan De Santi, Ph.D., an adjunct associate professor of psychiatry at NYU. De Santi has analyzed thousands of tests, like the ones I took with my neurologist in New Jersey, as part of her memory research.

“Normal testing range for a woman of 45 barely differs from what’s considered normal for a person 20 years her junior,” explains De Santi. She’s even willing to bet that had I taken this test two decades ago, I’d have performed just about the same. Or worse, because I had less invested. “Very seldom does an adult under the age of 60 come in and we find there is something going on,” she continues. “And even then, the problem tends to be related to depression or something other than dementia that can impair memory.” (See “When It’s Not Alzheimer’s” on page 4 for a list of eight conditions and drugs that impact your ability to recall information.)

Then why, I ask, are so many of us middle-agers pfumpfering around in search of our keys? Primarily, says De Santi, because we have so much more to pay attention to now than we did at a younger age. “When I was 20 I’d study for a few hours and go out and party the rest of the night,” says De Santi.”I look at my own life today…I’m working 15 hours a day. My efforts as an adult have to be much more directed for longer periods of time. We don’t realize how much we are demanding of ourselves and that we burn out after a certain number of hours.”

Undoubtedly, the ongoing salvo of information catapulted into our consciousness by Tweets, e-mails, and phones has only added to our distraction. Diverting our attention to interrupting phones not only causes memory loss, it decreases the accuracy of our memory altogether, according to some research. “We don’t start seeing significant and meaningful changes in memory performance until the age of 60.” And even then, in the absence of illness, that doesn’t signify inferior overall ability.

But there’s more to it. Much of the reason we start to worry about memory slip-ups after 40 is because, well, we start to give a hoot. “My daughters are in their 20s, and they sometimes lose their train of thought but think nothing of it. As adults, we notice this kind of thing because we are concerned about getting older and developing a dementia like Alzheimer’s,” Ralph Nixon, M.D., Ph.D., director of the Center, later tells me over the phone.

He also points out that copious media coverage about Alzheimer’s and memory problems has added to our generation’s elevated anxiety levels. As Nixon talks, my mind wanders back in time to all the hours I spent locked out of my college dorm room because I’d forgotten my key. I recall that year in elementary school when I lost four winter coats. I realize it’s true: To some extent, we do idealize what our memory might once have been.

This is your brain. This is your brain at 70.

Reassuring insights, for sure. But a short stroll down the hall to the office of Mony J. de Leon, Ed.D., quickly reveals that things aren’t quite so straightforward. Surrounded by models of the brain and colorful pictures of the same, de Leon is a sort of counterpart to De Santi: While De Santi analyzes performance, de Leon uses high-tech imaging tools like PET scans and MRIs to study the actual structure of the brain. And what he tells me is disconcerting: Although tests like De Santi’s are very good at detecting disease, they aren’t necessarily designed to track how the healthy brain subtly—but definitely—changes as we age.

“You see these structures here,” says de Leon, pointing to a pair of kidney-shaped red blobs on the scan of a 20-something adult. “And you see how much smaller they are in a scan of an adult in his 70s?” Those two red blobs, explains de Leon, make up the hippocampus, which acts as a sort of gateway for new memories. As that “gateway” shrinks with age, de Leon explains, it becomes less efficient at dispatching names, faces, smells, and more to other regions of the brain where they are stored as actual memories.

That’s not all that slowly begins to shrivel when we hit the age of about 40 (mind you, we’re still talking brain here). So, too, does the frontal lobe, says de Leon, as he waves his hand over a large region at the front of a rubbery model brain. “The frontal lobe acts like an index system. It’s responsible for retrieving all the memories that are stored elsewhere in the brain,” he says. When we find ourselves with a name or a word at the tip of our tongue, it’s not because the memory isn’t there, explains de Leon. “It’s because the machinery that is supposed to find that word is becoming less efficient,” he says.

De Leon goes on to explain that the frontal lobe is also responsible for something else: our ability to pay attention, that all-important piece of the memory puzzle that helps us actually notice where we put our coffee cup or truly hear what someone said her name was. At this point I’m imagining my frontal lobe being the size of a pine nut. “Tasks that demand attention are very vulnerable to age because as the frontal lobe shrinks it has less bandwidth, or capacity to manage information,” says de Leon. This doesn’t mean, however, that we’re doomed to a lifetime of being locked out of our cars. It simply means that as we get older, we have to take an extra second or two to look at where we are putting those keys, so our brains have a chance to grasp the information.

One more fascinating fact to consider: Men’s brains begin to age earlier than women’s, but we do, unfortunately, catch right up. “During and around the time of menopause, chemical and hormonal changes cause the brain to reduce in size. So by the time they are 60 to about 80, men and women are basically going downhill at the same rate,” says de Leon.

With all this shrinking and shriveling, how is it, then, that De Santi’s performance tests don’t reflect such changes? “Because they don’t ask the right questions,” says de Leon, almost smiling. Sure, portions of standard evaluations touch on age-sensitive issues like attention. “But if you really want to see how a 45-year-old brain compares to a 20-year-old brain, ask your subjects to perform tests that are speed dependent or that require them to switch back and forth between two tasks. That’s where the younger brain will dominate.”

But de Leon is quick to emphasize the flip side of this story. Apparently, while we may become less efficient at things like rattling off phone numbers backward, a lifetime of experience gives us tools that our children may lack to cope with and compensate for memory weaknesses. Aware that we may not remember to call a friend after her doctor’s appointment, we get to a place where we write ourselves a note on the calendar to do so. We’re not surfing the Internet or watching TV while talking to her on the phone. And, if her news is bad, we know all the right things to say. “That’s called wisdom. And in life,” says de Leon, “wisdom can take you pretty far.”

What to expect when you’re forgetting

A tool using PET scan technology to detect Alzheimer’s could be approved by the FDA this year. But experts debate whether it’s definitive and who should be tested. For now, talk to your M.D. and check out this list of signs that nothing’s wrong or something’s amiss.

Normal: Misplacing car keys

Not so normal: Not remembering what car keys are for or finding them in an odd place like the freezer

Normal: Worrying about your memory

Not so normal: Others telling you they’re worried about your memory

Normal: Periodically forgetting names of acquaintances

Not so normal: Struggling to remember names of close friends and associates

Normal: Forgetting why you walked into a room

Not so normal: Difficulty completing everyday tasks, like cooking a meal or making a call

Normal: Occasionally having trouble finding the right word

Not so normal: Searching for names of everyday items, like a vase or a tea kettle

Normal: At times not remembering where you’re going

Not so normal: Getting lost in your own neighborhood and not being able to get home

Normal: Forgetting what you ate while recently out to dinner with friends

Not so normal: Not recalling the entire experience

When It’s Not Alzheimer’s

Don’t jump to the dark side just yet. Trouble remembering is most often attributable to a range of less serious—and reversible—causes. If you are concerned about your recall, ask your M.D. if it could be…

…Depression: Considered a major cause of memory loss in middle age, the fog of this mental illness often makes people too unfocused and inattentive to file and recall passing events in and out of memory.

…Menopause: Declining estrogen levels during and around menopause are associated with some decrease in recollection.

…Hypertension: Untreated, this disease can chip away at your memory by cutting down on blood flow to the brain.

…Diabetes: Poorly controlled glucose levels in patients with diabetes have been shown to impair recollection in the short and long term.

…Sleep deprivation: Being tired makes it more difficult to pay attention and visually process information, which are key to the creation and filing of memories in the brain. What’s more, individuals with sleep apnea—a disorder in which a blocked airway repeatedly halts a sleeper’s breathing—show tissue loss in brain regions that help store memories.

…Thyroid dysfunction: Both hypothyroidism and hyperthyroidism disrupt a number of key steps in the memory formation and retrieval process.

…A vitamin deficiency: Vitamin B12 is crucial to brain health because it helps preserve myelin, the fatty sheath that protects brain cells or neurons. Left untreated, a B12 deficiency can cause permanent neuronal damage, including trouble remembering.

…Your medication: Memory loss is a side effect of several drugs, including some urinary incontinence drugs, over-the-counter sleep medications, certain antidepressants, and some steroidal drugs prescribed for chronic arthritis.

***

Whether or not you believe you are at risk for Alzheimer’s, try out these 5 healthy lifestyle changes that have been proven to save your brain.

P.S. Protect yourself from the coming data-powered panopticon by getting a VPN.

Health/nutrition journalist.

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