The reason why we get sick is the failure of our immune system to keep a pathogenic invasions of our body suppressed. Pathogens are microorganisms such as bacteria and viruses that are damaging to our bodies functions. We are surrounded by these pathogens all the time, but we are obviously not always sick. This is because our immune systems are usually able to fight them off. So to understand why we get sick, we need to understand what weakens our immune systems.
Our genes play a role in the strength of our immune systems. Depending on how the genes of our parents cross the natural prowess of each persons immune system will vary. Different peoples immune systems will also be more or less sensitive to specific pathogens.
Our diets are very crucial in the well-being of our immune systems. Lacking vitamins will result in a weakened immune system, as will the in-take of hard to process foods. Eating a natural, healthy, and varied diet will greatly increase the strength of ones immune system.
Another major factor is damaging drug use. Not only are many illegal drugs damaging, but legal ones as well. There is a pretty common misconception that is something is legal, than it is good for you, but this is simply not the case. Alcohol is very toxic to the body, specifically to the hippocampus in the brain and the liver. Damaging the liver is especially bad for the immune system since the livers function is to detoxify the body. Smoked tobacco may slightly decrease the strength of ones immune system. Though smoking American cigarettes, full of toxic additives and radioactive debris like radium 226, is most definitely going to decrease the strength of ones immune system. Also, many of the pharmaceutical prescribed for various reasons will deplete the effectiveness of ones immune system.
Any toxin you consume, be it in drug or food, diverts your immune systems attention. When there is something toxic being processed by your metabolism the immune system has to work quick to keep it from damaging you. As mentioned above though, pathogens are around us all the time. Increasing the workload of your immune system by consuming toxins, makes it harder for your immune system to efficiently suppress pathogenic invasions.
Aside from consumption habits, the other main factor is lifestyle. Sleep deprivation can weaken the immune system, as well as stress. While exercising and staying active are good for the immune system, denying the parasympathetic nervous system is not. Our parasympathetic nervous system serves to conserve our energy by decreasing our heart rates. This conservation results in more efficient gland productivity as well as increased digestion. The parasympathetic nervous system becomes activated whenever you are relaxed, and not in need of a fast heart rate. Allowing this system ample time to recuperate is important for immune system health.
Regardless of the genetic hand-of-cards dealt to each of us, the frequency with which we are overtaken by sickness is dependent on the decisions we make in our daily lives.