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.
Fifth on the list is the 27,800-acre McDowell Sonoran Park in Scottsdale, Arizona, U.S.A. Tours for hiking, rock climbing, and biking are either guided or unguided. Loop desert trails that features desert life and vegetation. Sixth on the list is the 25,700 acre Sanjay Gandhi Park in Mumbai, India.