Balance.

Routine Sleep Pattern - go to sleep earlier - wake up earlier. Get your body so used to a sleep pattern that you can wake up without a clock

Remove the toxins from your life - as much as possible remove the toxins in your own home ( there is not alot you can do to avoid the toxins outside of your house except for moving to the country and opting for eco-vacations rather than big city vacations. We did this by replacing just about every cleaner in our house with Basic H ( a Shaklee product ). It works and it is so non-toxic that I can even wash my vegetables/fruits with it ( in its most diluted form ).

Drink filtered watered - get a water filter pitcher and keep filtered water ready to go in your fridge.

Take your Vitamins - there is on going research about the benefit of vitamins but most of those research papers never tell you which brand of vitamins they studied - it makes a difference. Again I recommend Shaklee vitamins as they have years of science behind them and they have the greatest bioavailability of just about any vitamin ( meaning the pill goes in and is injested and put to work instead of just travelling through your system and going out the other end ).

Build up your core muscles - read the Alexander Technique.

Don't sweat the small stuff - stress reaks havic on our immune systems. Take a yoga class or study zen - read the serenity prayer daily.

Then no matter what happens live each day with zest and enthusiasm. There are no guarantees.
Source(s):
http://www.shaklee.net/heston

The Alexander Technique Manual: Take Control of Your Posture and Your Life

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following would help

1. eat balanced diet - with milk , fruits ,enough water

2. good sleep

3. Do some yoga .
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I really believe it's Traditional Nutrition as described by the Weston A. Price Foundation. It's based on a several-year long study of many ethnic groups across the globe; and ongoing analysis of research. Price took a team of researchers around the globe and looked at groups in which part of the groups were eating their traditional diets, and other parts were eating a Westernized diet. Researchers spent time measuring all kinds of health indicators.

What they found were that the traditional groups with the best health indicators shared certain dietary factors. What follows is a partial list. Their website is HUGE--many weeks' worth of reading, with good scientific journal citations to back up what they say--citations from studiest in JAMA, NEJM, the Lancet, and specialist journals.

The list of shared factors:

Source of calcium: either milk from pasturefed cows or goats, or the water source had a high calcium content (glacial run-off or lime deposits).

Animal protein, at least some of which was consumed raw: raw milk/cheese/butter; caviar/roe; straight raw meat, or raw eggs.

Lacto-fermentation of vegetables--traditional sauerkraut and relishes, as a form of preservation.

Bone broth used in cooking for a wide range of optimally bio-available minerals.

Grains either fermented (as in sourdough and some European breads, or beer), soaked (as in oatmeal) or sprouted before use. Grain for these groups was a very minor part of the diet.

The very healthiest groups reserved certain high-nutrition foods for those of childbearing age, both men and women, particularly seafoods. Some inland groups even had treaties with coastal groups so that even if they were at war, the foods would still be available to them.

These groups also ate very little in the way of sweeteners and no refined flour or sugar; no grainfed meats; no canned or jarred foods; no carbonated drinks.

Some other factors the Foundation has looked at are amount and quality of sleep; exercise; and environmental toxins.

Another important thing would be to try to avoid wiping out your beneficial bacteria using antibiotics. Taking a good probiotic helps keep your gut colonies healthy and replenished. Many of the unfriendly bacteria thrive on blood sugar, so keeping that under control is important, too.

It's entirely possible to eat this way in the U.S., because it is a growing movement. My family has been doing this for close to 9 years, with very good results.
Source(s):
http://www.westonaprice.org

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First, I am not a doctor and have no medical experience. I did find an excellent and easy to understand article on the immune system from here;

http://www.niaid.nih.gov/Publications/immune/the_immune_system.pdf

I also found an article here that lists ways to boost the immune system,

http://naturalmedicine.suite101.com/article.cfm/10_ways_to_boost_immune_health

I don't know whether this is good info or not, because this article from a doctor suggests that immune boosters are a scam;

http://www.everydayhealth.com/blog/zimney-health-and-medical-news-you-can-use/immune-system-boosters-are-a-scam-part-2/
Source(s):
http://www.niaid.nih.gov/Publications/immune/the_immune_system.pdf

http://naturalmedicine.suite101.com/article.cfm/10_ways_to_boost_immune_hea...

http://www.everydayhealth.com/blog/zimney-health-and-medical-news-you-can-u...

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I have an auto-immune disease, and my doctor said to do all the normal things: exercise, eat right (fruits, vegetables, milk), and get plenty of sleep. I will say that if I don't get good sleep starting early in the night, after a couple days, my hands will ache. Sometimes I need 9 hours of sleep, but it's worth it to be healthy.
Source(s):
personal experience

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To keep your immune system healthy all you really need is regular exercise, plenty of sleep, and a good multivitamin. For complete total body wellness, it's a bit more complicated, but for the immune system itself those are the keys.
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I am a Doctor. But this is only an answer to a question you asked in an open forum. So this answer does not inform you take my advice from this answer on any health related matter involving you or people you know. You should consult a doctor in person on all your (or people you know) health related problems.

And the Answer to your question is;
To keep your Immune System Healthy you have to
1) Modify your eating habit - You have to eat timely , eating timely as a routine will help your body to digest food better and efficiently. You have to eat Fresh Green vegetables and fruits raw if possible.

2) Modify your sleeping habit - you have to sleep on time everyday and try to get adequate sleep. Sleep helps to boost up our immune system.

3) Exercise - You have to exercise for at least 30 min for 3/5 days a week.

4)Drink water - you have to drink adequate amount of fresh water.
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