How to keep the immune system healthy

The immune system is a host defense system comprising many biological structures and processes within an organism that protects against disease. Wikipedia. How do you keep your immune system going without breaking down? These eight steps can help support your immune system so it's ready to fight those viruses.
Eat plenty of fruits, vegetables, and whole grains.
Get at least 30 minutes of exercise most days of the week.
Get enough sleep.
Wash your hands.
Keep up with your vaccinations. Almost everyone who's at least 6 months old should get a flu vaccine every year.
Keep your weight healthy.
Don't drink too much alcohol.
Don't smoke. Don't overdo supplements. Taking too much can be bad for you. Your doctor can let you know what you need. Also stress can be a contributing factor to the breakdown of an immune system of an individual. STRESS is a state of mental or emotional strain or tension resulting from adverse or demanding circumstances. You can take action to tame stress by making these steps part of your stress management plan:
Get enough sleep.
Learn and use relaxation techniques.
Exercise.
Take time for yourself.
Build your support network of people you can talk to.
Consider counseling, especially when you're going through a very stressful time. Consulting a nutritionist is also a recommendation....So your nutritional status is known and measures needed put in place to prevent any serious nutritional or medical complications. Our health should be our major concern.