One habit to curb is eating or drinking more than 100 grams (8 tbsp) of sugar a day. That much sugar reduces your white blood cells’ ability to kill germs by 40%! Also limit your alcohol intake, as studies show that three or more alcoholic drinks daily is enough to suppress your immunity.
If anxiety or stress interferes with your ability to function or care for yourself or your family, seek professional help. Check-in with your personal physician, contact your company-sponsored Employee Assistance Program (EAP) if you have one.