5. Quit Smoking
In an older but still relevant study published in the 1983 edition of the Medical Journal of Australia, immune system markers in 35 smokers were analyzed before they quit smoking and then again three months after they had quit. Compared with a control group who continued to smoke, the ex-smokers had significant, positive changes in many measurements of their immune systems. Smoking and using tobacco products contributes to a host of health problems, and this is one more you can add to your list for reasons to quit.
6. Consume Alcohol in Moderation
Chronic alcohol abuse is defined by the Diagnostic and Statistical Manual of Mental Disorders as the use of alcoholic beverages despite negative consequences. Besides the social and economic consequences of chronic alcohol abuse, a 1998 article in the journal Alcoholism: Clinical and Experimental Research states that alcohol abuse can also cause lead to immunodeficiency, making you more susceptible to bacterial pneumonia, tuberculosis, and other communicable diseases. But the moderate use of alcohol (one drink daily for women, and two for men) has not been associated with negative effects on the immune system. In fact, according to a 2007 article in the British Journal of Nutrition, there is an increasing body of evidence linking health benefits linked with moderate consumption of polyphenol-rich alcoholic beverages, like wine or beer. The article states that, while heavy alcohol use can suppress the immune response, “moderate alcohol consumption seems to have a beneficial impact on the immune system compared to alcohol abuse or abstinence.” So for the time being, the advice remains: everything in moderation.