Lately I've been catching colds all the time, even though I used to be healthy. My friends say it's an immune system problem. Is there any way to strengthen it or does it all depend on your genes?
They already said the right things about lifestyle above. I'll just add from my own experience - when I go ice fishing in winter on Lake Baikal, there's cold and humidity, but I rarely get sick because I sleep normally and have no stress.
What actually helps most: regular walks (especially in the cold), proper sleep for 7-8 hours, and avoiding sudden spikes in activity.
Food-wise - nothing supernatural, just don't overdo sweets and eat more vegetables. If you get sick often without obvious reasons, it makes sense to get tested for vitamin D and iron - that's often the culprit.
Your immune system works like a protective shield - white blood cells and antibodies destroy viruses and bacteria, but things go wrong because of stress, lack of sleep, poor nutrition, and seasonal factors (we get sick 40% more often in winter).
Genetics plays a role, but it's not a death sentence - I've noticed myself that when I sleep properly, eat fish with omega-3s, and avoid stress, I hardly ever catch a cold.
Try sleeping 7-8 hours a night for at least a month, add vitamin D (especially relevant in winter when you're spending a lot of time indoors), vitamin C, and cold showers - often helps better than expensive supplements.
The folks above already described shields and white blood cells correctly, but I want to add something from my own experience 😊 When I switched to farming and started spending more time at my dacha, I noticed I caught colds way less often. The thing is, immunity isn't just a shield, it's a living system that needs constant "training". When you're sitting at home, your body doesn't encounter different strains, but when you go out to the garden, to the fields - you're constantly in contact with microbes and viruses, and your immune system gets stronger. Plus fresh air, physical activity, quality sleep - these aren't separate factors, they're one whole package.
About genes - yeah, genetics plays a role, but it's not the deciding factor. The fact that you used to be healthy and now you're sick all the time probably means your routine got messed up. Check if you're getting enough sleep (I need at least 7-8 hours for normal immunity), drink enough water, don't sit constantly in a stuffy room. If you live in the city, try to get out to nature more often. And vitamins matter - in fall and winter in 2026 I always take vitamin D, it really helps 💪
If nothing changes despite all the lifestyle changes, then you should get blood work done at a doctor's - there could be some hidden inflammatory process or a serious deficiency of something.
I've noticed this myself too - there are periods in life when you're constantly getting sick, and then there are stretches where you hardly think about colds. I used to think it was just luck or bad luck, but then I got it: it really does come down to how you live. Genetics plays a role, sure, but not as big a one as it seems. I've seen people with terrible genetics who, thanks to their lifestyle, get sick less often than their supposedly healthy acquaintances.
The main enemies of immunity are what's already been mentioned: chronic sleep deprivation, constant stress, poor nutrition. But there's one thing people often overlook: your body needs to adapt to the cold. Sounds weird, but when you're always sitting in the warmth, constantly bundling up and avoiding drafts, your immune system gets lazy. Once I started taking contrast showers and stopped wearing a jacket at the slightest sniffle, I got sick less often. Not because I'm hardening myself in the classical sense, but because my body got used to temperature fluctuations and responds to threats faster.
Another thing: spend a lot of time outside, especially when you're heading to work. Fresh air, movement, sunlight - that works better than any vitamins. And yeah, vitamin deficiencies happen, but usually they're secondary, not the root cause. First get your sleep sorted, get moving, manage your stress - that's what'll actually change things.
I agree with what was written above about stress and sleep deprivation - these really are the main enemies of immunity, I went through it myself.
But I want to add a practical point: when I started traveling a lot by car across different regions, I noticed that frequent climate changes and long hours on the road immediately take a toll on your body's defenses.
Try to analyze what changed in your life over the last six months to a year - maybe you're spending more time in air-conditioned rooms, started dealing with more stress, or your sleep schedule changed. Genetics of course plays a role, but in 2026 it's already proven that lifestyle has way more of an impact - so really ask your doctor to check your vitamin D and B12 levels, that often turns out to be the bottleneck.
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