The main role of our immune system is to protect the body from the attack of microorganisms that cause infection. Weak immunity is the main cause of diseases, illnesses and infections that affect us. Some factors that weaken the immune system are stress, inactivity, poor lifestyle, dehydration and faulty diet. People who have weak immunity are likely to suffer from cold, flu and other diseases. Children have very weak immunity. A strong immunity helps in killing the disease causing microorganisms. It helps in removing harmful poisons. Home remedies help in making the immune system strong and healthy. The top 8 home remedies to improve low immunity.