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.
With more than 72 million acres, Arizona was one of the largest states in the country. However, much of the land was undeveloped and unusable for agricultural purposes, leading to a valuation of just $315 billion, or $4,300 per acre, nearly one-third the value of an average acre in the lower 48 states.