Expecting a cold? Here's what you can do to help get one: *Eat a poor diet. Make sure your body lacks the vitamins and minerals it needs. Eat lots of processed foods. *Avoid rest. Stay up too late and do too much. *Stop exercising. Your lymph system depends on exercise to circulate germ-fighting fluids, so sit around and watch tv. *Think negative thoughts. Pay attention to news reports about outbreaks of the flu and to advertising for cold medications. *Invite stress. Expose yourself to temperature and humidity changes, along with worry. *Become dehydrated. Avoid drinking enough water. *Forget your appointments. Shun periodic chiropractic checkups that help you stay well.