The best way to prevent disease from affecting you is having a strong immune system. For strong immune system our body needs antioxidants, nutrients and other components which can be provided by changing our daily diet.
Our GI tract is 70% of our immune system, if it works well here all will be well and if any problems occur here then our immune system is weak. Basically GI tract is house of good gut bacteria which defends us against harmful bacteria and diseases.
Another important factor in a strong immune system is probiotics. They are fiber which helps the good microbial in our body. Some probiotics rich vegetables are garlic and onion. Some fruits such as banana, apple and citrus fruits are also good sources for probiotics. Yogurt is considered to be the best source of probiotics.
If you have been affected by disease then start having products with natural healing characteristics such as honey and green tea.