Best Answer: There are many factors that can weaken your immune system, depression certainly wont strengthen it. But here are some other factors that may cause your immune system to be bad, or increase your risk to illnesses.
ARIZONA'S PUBLIC LANDS -- BOTH BLESSING AND BURDEN. Arizona covers 72.6 million acres and is the 6th largest state (after Alaska, Texas, California, Montana and New Mexico); but only 15 states have fewer people. Land for growth ought to be plentiful, yet in Arizona there is a short supply in many communities where it is needed most.
Maricopa County. Maricopa County is located in central Arizona. The county has a total land area of 9,224 square miles, making it the fifth largest county in Arizona. Maricopa County is the most populous county in Arizona, comprising about 57% of the states population. As of the 2010 census, Phoenix is the largest city, with a population of 1,445,632.