Abstract
Dietary habits are one of the main causes of fatal diseases such as cardiovascular disorder, cancer and diabetes. This paper aims to illustrate a proportional relationship between diet and behaviour of the immune system which responds when a human body is being attacked by pathogens. However, if a person's diet is well balanced their immune system will improve and vice versa. Nonlinear ordinary differential equations are formulated to describe the behaviour of the immune system and its response when a human body gets infected by a pathogen. This model considers two populations: normal cells and immune cells. In addition, the model has been monitoring the behaviour of the immune system for thirty days using Mathematica 10.0 software. The results prove that well balanced and regular diet can boost the immune system and improve its response to protect a human body from diseases. In conclusion, a balanced diet plays a huge role in reducing the percentage of lethal diseases.