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.
Arizona is well-endowed with desert country, though the state is hardly the parched, arid wasteland it's often perceived as: There are also mountains, rich conifer forests and rolling grasslands. A number of distinct deserts spill into Arizona, though they're boundaries are sometimes poorly defined.