The body’s immune system’s first line of defense against disease are barriers that prevent antigens, which are large protein molecules of bacteria, viruses, chemicals and other substances that appear harmful from entering your body. The barriers include your skin, mucus, cough reflex, stomach acid and even enzymes in your tears, which destroy toxins. If the antigen or toxin manages to get past these barriers, then the immune system launches a second line of defense, found in your blood. They are white blood cells, which perform a protective function by seeking out and destroying foreign protein antigens.
If you suffer from a low immune system it is important to avoid things that suppress or act to destroy it, such as a high cholesterol diet, heavy metals (lead, mercury, cadmium), fat, alcohol, fried foods, food additives, obesity, industrial pollutants, pesticides, herbicides, stress, prescription drugs, too much sunlight, tobacco, and radiation.
Unfortunately, there is no “magic bullet” that you can take to quickly repair your immune system, but there are several ways to help build and support it by providing your body with proper nutrition, regular exercise, adequate rest, relaxation and maintaining a positive mental attitude.
Taking the following dietary steps will help protect and build your immune system: 

1. Limit saturated and trans fats, food additives and alcohol
2. Take a good quality multi-vitamin/mineral supplement daily
3. Ensure your diet includes adequate protein
4. Take 1000 mg of Vitamin C daily.
5. Eat 3 to 4 servings of vegetables daily.
6. Eat 3 to 4 servings of legumes weekly.
7. Eat 3 to 4 servings of omega-3 fatty acid-rich foods weekly

The length of time required to rebuild a low immune system of course will vary depending on your individual situation and environmental exposure to immune system suppressants. This is not an overnight process, for some people it can take three months to two years. Obviously, the higher your exposure has been to immunosuppressants, the longer it will take to build your immune system. Children tend to heal much more quickly than adults or the elderly.
People with allergies and asthma will find that their asthma and allergy symptoms become less frequent and less severe when their immune systems are strong. It’s important to avoid using allergy and asthma drugs for a long time, which can have side effects. There are natural supplements that safely and effectively eliminate allergy and asthma symptoms. It is important to seek advice from your healthcare professional before taking an approach suitable to you.

Sprains and strains are very common injuries, especially in children and those who do sports. Because of the very similar symptoms they present with, most of the people do not make a difference between these two. Sprains are injuries of the ligaments which are connective tissue bands that enclose and support joints. Even though strong in nature, sudden forces can overstretch, twist or torn them, or even lead to rupturing of the ligament. Common locations for sprains include the knees, ankles, wrists and thumbs. On the other hand, Strains are injuries of tendons – structures that attach muscles to the bone or muscles themselves. Common sites for strains include the calf, groin and hamstring.

There are many reasons why these injuries occur. Most often they happen during some sporting activity, when the person changes the speed or direction of movement suddenly, or falls awkwardly or collides with another person or object. There are some predisposing factors that may increase the risk of injury if any of the above situations happen: inadequate warm-up, overusing poor-conditioned muscles and following inadequate technique.

These injuries and the symptoms they present with can arise acutely (suddenly), or chronically (develop gradually). The symptoms of both sprains and strains usually are severe pain, cramping, swelling around the injured site, inflammation, bruising and of course, limited movement.
People usually manage these at home, by using painkillers and resting. But it is essential that you visit your doctor as he/she may notice some ominous signs you cannot see. Some of the injuries are more severe, and treatment with painkillers can only mask the pain but leave serious consequences. Your doctor will do regular physical exam to make the diagnosis and in more complicated cases, he/she may offer X-ray imaging of the affected area to exclude and prevent any serious complications. Doctor can prescribe you medications and suggest other treatment options, from immobilization to surgical procedures. Even the rupture of the ligament does not always require the surgical treatment, but if not properly managed and rehabilitated, it can cause further damage and have impact on the quality of life by narrowing the range of movements of the injured joint. After initial assessment and treatment, to preserve the function of the injured ligament or tendon, physical therapy is of the utmost importance. Specific exercises and their frequency can be prescribed only by a professional, so do not hesitate to ask for consultation.