25 Everyday Habits That Are Shrinking Your Brain Right Now

Added: 2026-05-05

[00:00:00]We all have a few go-to habits that get us through the day. Some save time, some save effort, and some just make things a little more comfortable. Nothing wrong with that. But a few of those everyday choices come with trade-offs most people never think about. From skipping things your brain actually depends on to leaning a bit too hard on convenience.

[00:00:23]I'm Mike with List 25 and these are 25 everyday habits that are shrinking your brain right now. 25. Skipping breakfast.

[00:00:33]If we have a busy morning, a nutritious breakfast is usually the first thing to go. You tell yourself you'll eat later, and most of the time you do. The issue is what happens in the meantime.

[00:00:46]Researchers looking at university students found that for a lot of them breakfast just doesn't happen. In one study around twothirds were skipping it regularly and when they were tested the gap became obvious. Tasks that rely on memory, attention and quick reactions all took a hit compared to those who ate in the morning. Tasks that rely on memory, attention, and quick reactions all took a hit compared to those who ate in the morning. That's not just about feeling low on energy. It's your brain working with less fuel right when it needs to be at its best. And that gap can carry through the rest of the day in ways people rarely connect back to that first skipped meal. 24. Avoiding social interaction.

[00:01:29]It's easy to pull back from people without really noticing it. You answer fewer messages, skip plans, and keep conversations short because you just don't feel like dealing with them. At first, it feels like you're protecting your time and energy. But a large analysis of multiple long-term studies found that people who reported feeling lonely had a significantly higher risk of cognitive decline and dementia. The increase was around 31%. And it remained consistent when other factors were taken into account. There is a key detail in all of this. The risk is tied to loneliness, not just being alone. You can spend time around people and still feel disconnected. You can be by yourself without any negative effects.

[00:02:13]What seems to matter most is whether you feel genuinely connected. And when that starts to drop off, your brain feels it.

[00:02:21]23. Letting hearing problems slide.

[00:02:25]Hearing loss is something most of us don't notice at first. It's not that sounds disappear. They just become harder to make out, especially when there's background noise. So, most of us adjust without really thinking about it.

[00:02:37]But when your ears aren't picking up sound clearly, your brain has to step in and fill the gaps. It works harder to piece together speech and make sense of what you're hearing. And that increased cognitive load has been linked to memory problems and a higher likelihood of developing dementia. Research also shows that the longer hearing loss goes untreated, the greater the risk becomes.

[00:02:59]So, it's not just about hearing less, it's about how your brain has to adapt, and that comes with a cost over time.

[00:03:06]22. Relying on GPS for every trip.

[00:03:11]There's a difference between going somewhere and knowing how to get there.

[00:03:16]GPS closes that gap for you. It removes the need to pay attention, to remember, or to make decisions along the way. You just follow the instructions and keep moving. The downside is what your brain stops doing in the process. When researchers compared people using GPS to those navigating with landmarks, the ones following directions showed less engagement in the hippocampus, the area linked to navigation and memory. That part of the brain strengthens through use the same way any skill does. When you stop relying on it, even for something as routine as getting around, it has fewer chances to stay sharp. 21.

[00:03:56]Structuring your life around constant convenience. Pay attention to how quickly you move on from things that take effort, a question you could answer yourself, something you could remember, a challenge you could sit with for a bit longer. Most of us do not wait. When everything is built around speed and ease, your brain stops expecting to do the heavy lifting. It adjusts to getting results without much input. That might sound efficient, but it comes at a cost.

[00:04:23]Studies suggest that regularly offloading those small thinking tasks can lead to more shallow engagement and a habit of relying on external help instead of building your own understanding. 20. Habits that disrupt a good night's sleep. What do you do at night to ensure you have a good night's rest? In fact, what do you do during the day? Several studies have now proven that people whose sleep was broken up more often in their 30s and 40s were far more likely to show weaker memory and slower thinking years later. The group with the most disrupted sleep actually had more than double the risk of poorer cognitive performance a decade down the line. The tricky part is that you can spend enough time in bed and still not get the kind of sleep your brain needs.

[00:05:08]If it keeps getting interrupted, it never really settles into a full reset.

[00:05:13]19. Ignoring snoring and breathing issues. Many large-scale studies tracking thousands of adults have found that people showing symptoms of sleep apnea report around 50% more issues with memory, focus, and clear thinking compared to those without. That follows what I said earlier because your brain depends on steady uninterrupted sleep cycles to sort, store, and reset information from the day. When your breathing keeps getting disrupted, even if you don't fully wake up, that process keeps getting cut short over and over again. So, if you have trouble with snoring, waking up tired, or feeling foggy during the day, it might be worth starting a conversation with a doctor or health professional. A proper sleep study, or even a home test can give you real answers, and treatments like prescribed CPAT machines or custom mouth devices can make a noticeable difference. 18. Replacing sugar with artificial sweeteners. Artificial sweeteners have been marketed as the smarter alternative to sugar for years, especially for people watching their weight or managing blood sugar. But long-term data is starting to complicate that idea. In one large study, adults who consumed artificially sweetened drinks on a daily basis had a noticeably higher risk of developing dementia compared to those who rarely drank them.

[00:06:35]Researchers are careful not to jump to conclusions and for good reason. There are a lot of moving parts here, including underlying conditions like diabetes that are already linked to cognitive decline. At the same time, there is growing interest in how artificial sweeteners may affect the body beyond just calories. Some evidence suggests they can influence insulin responses or alter gut microbiota, both of which play a role in long-term brain health. 17. not getting enough vitamin D. If that sounds like you from the get-go, just know that a bit of sunlight, foods like salmon, eggs, or fortified milk, and even a basic supplement can already do you a lot of favors. It doesn't take much to keep your vitamin D levels in a healthy range. But it is something a lot of people overlook without realizing it.

[00:07:26]Yes, not getting enough vitamin D has also been linked to a higher risk of dementia, but most of the studies pointing to that connection haven't been able to 100% prove the direct cause, and factors like overall health or lifestyle could be influencing the results. Still, vitamin D plays a role in brain function, especially when it comes to inflammation and cell support. At the end of the day, getting some sunshine and eating a bit better is a pretty solid habit to have anyway. 16. Not washing your fruits and vegetables.

[00:07:58]I know you do it because we all do. I mean, what harm can a few unwashed apples do? Well, as it turns out, a lot.

[00:08:07]The problem is that what you can't see is often the bigger danger. Fruits and vegetables can carry traces of pesticides from farming, transport, and storage. Those residues don't just disappear on their own. Now, most people aren't dealing with extreme exposure, so this isn't something to panic about. But research has linked certain pesticides to effects on memory and learning. And it's worth noting that a lot of these chemicals are designed to affect biological systems, which include the nervous system. That said, this is one of the easiest fixes on today's list. A few seconds under running water and you already have reduced a chunk of that exposure without changing anything else.

[00:08:46]15. eating ultrarocessed foods. Take a look at the back of something like a frozen pizza, flavored yogurt, or even a loaf of packaged bread. The ingredient list usually keeps going longer than you expect. And a lot of those names are not just there for taste. They're there to keep texture stable, extend shelf life, or stop ingredients from separating.

[00:09:07]Things like emulsifiers, stabilizers, and thickening agents show up in more foods than we realize. And all of those additives can wreak havoc on your gut.

[00:09:17]So much so that they can alter the balance of bacteria in your digestive system and even affect the gut lining itself. That can lead to low-grade inflammation, which has been linked to a range of long-term health issues, including those that affect the brain.

[00:09:32]14. Having too much sugar. I know we just can't win if it isn't sweeteners, it's sugar. But the danger here is not sugar itself. It's how much and how often it shows up. Your brain runs on glucose and it uses a huge portion of the body's energy just to keep things functioning dayto-day. So, if there's simply too much, it can start to wear down how the brain functions.

[00:09:59]Researchers have linked prolonged high glucose levels to weaker memory, slower thinking, and changes in brain structure, including shrinkage in certain areas. On top of that, circulation of the brain can be affected as well, which makes the overall impact harder to ignore. Three, not drinking enough water. Most of us do not connect hydration with how clearly we think. But the link is there whether you notice it or not. Your brain depends on proper hydration to maintain the conditions it needs for communication between cells.

[00:10:31]And when those conditions are off, your performance starts to dip. You're more likely to make simple mistakes, take longer to get through things, and struggle to remember stuff you normally wouldn't. It can also increase your overall fatigue, and then I'm not even getting into all the issues it creates in the rest of your body. Luckily, the moment you have that glass of water, both your mood and cognitive performance tick up again relatively quickly. So, there's a quick fix. You only have to build up the habit. 12. living with constant background noise. Try doing something that actually requires focus, like reading, writing, or even just remembering a short list while someone is talking nearby. You can still get through it, but it takes more effort than it should. You reread things, lose your place, or forget what you just saw.

[00:11:21]That's because your brain is wired to pick up sound, especially if it sounds anything like speech. Even when you're not trying to actually listen, part of your brain is still following it, which is why it starts interfering with things like your memory and reading. That split focus makes it harder to process and retain information. And if you've got constant exposure without any real breaks, there's a noticeable effect after a certain amount of time. 11.

[00:11:48]Screen time. At some point in the last couple of years, screens stopped being something we use and started being something we live on. We work, read messages, watch videos, doom scroll, connect with friends and family, and honestly, it just keeps going. And the weird part is it doesn't even feel like effort, which makes its effect easy to miss. There's now evidence linking higher screen use to changes in people's brain structure, including less gray matter and differences in their white matter. That's tied to how you process information and how well different parts of your brain stay connected. It's still being studied, but it points to more than just a person's total screen time.

[00:12:33]Frequency, type of content, and how continuously you're exposed all seem to factor in. 10.

[00:12:42]Not spending enough time in nature.

[00:12:44]Getting out in nature or even just spending time in a park or your own garden has been linked with lower stress levels, better mood, and improved attention. Scientists think that part comes down to the fact that you're just switching off for a bit. As much as we try to power through it, our brains take a hit from constant input. And it doesn't really go away just by sitting still or doing something else indoors.

[00:13:08]Studies have found that as little as 10 to 20 minutes in a green environment, walking, sitting, doing anything in a natural setting, can noticeably improve your brain function. So, beyond the fresh air and a bit of movement, it's one of the easiest ways to give your brain the kind of breather it actually responds to.

[00:13:26]Nine, breathing stale and stuffy air. I know I covered going outside, but enclosed spaces come with another health hazard. Too much CO2. If it's bad for the planet, imagine what it does to your brain. If you're in a smallish closed room, the CO2 levels can easily double in under an hour just from people breathing, especially if the windows stay shut. And once levels creep past about 1,000 ppm, which happens in a lot of offices and classrooms, studies have shown measurable drops in focus and decision-making. That means you can walk into a room, sit down, and within an hour, you're already working with less than your best mental capacity without noticing anything obvious. Eight, frequent multitasking.

[00:14:15]Your brain isn't built to focus on multiple things at once. What's really happening is that it's switching back and forth between tasks, often very quickly. And because of that constant switching, people tend to perform worse trying to do several things at the same time than they would if they handled them one by one. Still, a lot of people are convinced they're good at it. So, researchers decided to test that idea. A team at Stanford first asked participants how well they believed they could multitask, then measured how well they actually performed. The group that trusted their multitasking skills the most ended up doing worse than those who avoided it altogether. Research from the Institute of Psychiatry in London additionally found that multitasking can temporarily lower your IQ by about 10 points. A bigger drop than what's been observed after smoking marijuana or missing a full night of sleep. Seven.

[00:15:10]Smoking or vaping. Both tobacco smoke and ecigarette vapor can interfere with your memory and overall brain function, especially if the exposure takes place over a long time. What's happening behind the scenes is a mix of inflammation and oxidative stress. These chemicals don't just stay in your lungs.

[00:15:29]They move through your system and can cross into the brain where they start affecting how neurons function and communicate. that can lead to damage in the areas tied to memory including the hippocampus which plays a key role in forming and storing new information.

[00:15:44]Secondhand and even thirdand exposure carry similar risks and it tends to hit children and adolescence harder with research showing impacts on attention, learning ability, and even language development. Six, chronic stress. How often do you walk into a room and just stop for a second because you forgot why you're there? Or read the same line three times and still don't have an idea what you just read. When stress sticks around for too long, your brain doesn't stay in thinking mode. It leans into survival mode instead. The part that helps you plan, remember things, and think things through kind of takes a backseat while your system focuses on reacting. That works fine in short bursts, but when it keeps going, you start to forget little things, lose your train of thought, and struggle to stay focused. If that stress doesn't ease up, the same after effects tend to hang around a lot longer than they should.

[00:16:40]Five, staying overweight. Excess body fat doesn't just affect how your body looks, it changes how your body runs. In one study by the German Research Foundation, researchers looked at brain activity in a group of obese women and found that their brains were using glucose at a faster rate than those of women at a healthy weight. The same group was tested on cognitive tasks before and after weight loss surgery.

[00:17:06]After the surgery, their scores improved, especially in areas linked to planning, organization, and decision-making. Another study followed nearly 500 adults and found that people carrying excess weight tended to have less white matter than those at an average weight. In some cases, the white matter volume in a 50-year-old with obesity resemble that of a 60-year-old at a healthy weight, which is really scary when you come to think about it.

[00:17:32]Four, not challenging your brain. The moment you spend some time doing mentally challenging activities, you're actually helping your own brain to build more connections between brain cells.

[00:17:44]Those connections are what keep everything running smoothly. The more you have, the more ways your brain can get information from one place to another. So, when something goes wrong, think something like a brain injury, or when life starts to slow down when you grow older, a brain with more of those connections has a much better chance of working around it. one with fewer connections doesn't have that same flexibility.

[00:18:08]Three, taking multiple medications at once.

[00:18:12]Some of us need multiple prescriptions.

[00:18:15]That's just how it is. But once you begin layering in over-the-counter meds, you're dealing with combinations that aren't always predictable. And according to science, that can go in different ways. The general assumption is that more medication means more strain on the brain. But the research doesn't always line up that way. In some cases, people taking multiple medications have shown a lower risk of cognitive decline depending on the type of drugs involved.

[00:18:42]That's because some of those medications are managing conditions that would otherwise damage the brain over time. At the same time, others can have the opposite effect. So, if you don't know what you're doing, it's better to stay away from unnecessary combinations.

[00:18:56]Two, not getting enough iodine. An iodine deficiency can severely influence a developing fetus during pregnancy to the point where it's been shown to reduce a child's IQ by around 8 to 10 points, but adults can feel it, too.

[00:19:11]Iodine is needed to produce thyroid hormones. And when your levels drop, things start to slow down. Your focus comes and goes, your thought processes are slower, and your energy levels feel drained more often than not. But that doesn't have to be the end of the world.

[00:19:28]In the same way you can boost your vitamin D levels from fish and fortified foods, you can get iodine from iodized salt, dairy, eggs, and again the occasional bit of seafood. One using the internet. Okay, before I do this one, let me just add that this one didn't come from a peer-reviewed scientific study, but a Canadian one backed by Microsoft, which decided to put some numbers to it. Researchers surveyed over 2,000 people and even used EEG brain scans to track attention. They ran the same kind of measurements twice. Once around 2000 and again in 2015 just to be sure and discovered a noticeable drop.

[00:20:09]The average person's attention span went from about 12 seconds to 8 seconds over that period. Yes, my friends, that's officially shorter than the attention span of a goldfish. The report did note that people have become better at juggling multiple streams of information, which makes sense given how we use devices now, but that shorter window of attention means it's easier to lose focus and harder to stay on one thing for long. And that's a wrap. Out of everything I covered, which one do you think is affecting you the most without you noticing it? Something you wouldn't have thought twice about yesterday? Be honest and drop it in the comments. Then again, if you're not in the mood for chatting, but would rather keep on watching, our related video, 25 facts that will haunt your brain, will tell you all about the birds that got killed during the Miracle Landing on the Hudson and how men died after receiving donor kidneys infected with parasites.

[00:21:04]Oo, fun. That link is going to appear right here any second. Thank you guys so much for watching. Truly couldn't do this without you. As always, like, share, comment, subscribe, hit the notification bell so you never miss out on any new content, and I will see you again next time.