Which foods actually help immunity or is it just marketing?

The most important thing is that immunity works as a system, not something that gets activated by a single food. When people talk about oranges or ginger, they forget that vitamin C is needed in a specific amount, and any excess just gets excreted in urine. What actually works are the basics: regular sleep, physical activity, and no chronic stress. Without those, no berries will save you.

On the food side, there are three main approaches. First - sources of vitamins D and B, zinc, selenium (fish, meat, eggs, nuts). Second - fiber and fermented foods like sauerkraut or yogurt - they feed the beneficial gut microbiota, where a significant part of your immune system lives. Third - supporting overall health: not overeating, minimal sugar and trans fats. That's what actually has scientific backing.

One thing people often miss: you don't need to chase exotic stuff. Regular carrots, fresh cabbage, fish, cottage cheese, and a handful of seeds will do more good than expensive berry powder. And here's another thing - if you don't have an obvious deficiency (weakness, frequent illness), extra vitamin complexes can actually cause harm, because too much of some vitamins is toxic. Better to get tested if you're concerned.

Sleep and routine matter way more than any superfoods. Chronic sleep deprivation destroys immunity faster than a kilogram of lemons could ever build it up, but a stable daily schedule and solid 7-8 hours of sleep really do help your body keep its defenses in shape. Plus stress management and physical activity - it all works together as a system, and food is just one piece of the puzzle here, not a magic pill.

Here's the catch: even if vitamins and minerals are important for your immune system, you can't stockpile them - your body doesn't store water-soluble vitamin C, and fat-soluble vitamin D gets deposited in fat and the liver, but not indefinitely either. So all these "immunity boost courses" in September are basically placebo plus wasted money if you don't have an actual deficiency.

What actually works: eating normally (vegetables, meat, fish, dairy), getting sleep, managing stress, and staying active. If you suspect you're deficient in a specific vitamin - get tested and take supplements based on your results, not just blindly. And yeah, by the way, most healthy people who eat a reasonably varied diet don't have deficiencies in the first place.