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According to Nutritional Immunology, people's daily diets have a direct impact on the performance of their immune systems, as well as the way they look, feel, and behave as a whole.

Food is like fuel for the immune system. Normally, our bodies will obtain a good amount of nutrition when we consume wholesome plant foods picked at the right time. However, when we eat too many animal-based products or foods that are high in saturated fat, salt, and sugar, the immune system will lack the nutrients it needs to fight against diseases. When we are in good health, whole foods help strengthen our defenses. When we fall sick, proper nourishment and sufficient rest can help us to recover faster. 

Nutrition and drugs are not necessarily mutually antagonistic. They are equally important in the fight against disease because they can complement each other. The likelihood of a complete recovery becomes higher when the immune system is nourished properly and adequately to help it function smoothly while undergoing treatment and using appropriate medication. Conversely, even with the best medicine in the world, a quick recovery from an illness is unlikely if the immune system is weak. 

Human beings have been afflicted by disease since the beginning of mankind. But the weakening of the immune system may further fuel the rampage of diseases in modern times. Many factors have led to the increase in immune-related diseases. But the underlying issue is the quality of the food we consume.

Much of today's food contains preservatives and pesticides. They are often highly processed, thereby lacking the nutrients needed by the human immune system, such as phytochemicals, antioxidants, and polysaccharides. Yet these are exactly the nutrients the immune system desperately needs to work efficiently.