When I am stressed out a lot I find that taking a walk helps me. I try to think positive things while I walk or just concentrate on how nice the walk is and how it makes me feel. Also, I try to figure out what is stressing me out. Is it a permanent thing or something I can change. If I don't have control over the situation, is there something I can control about it such as how I react to the situation. As far as eating goes, I don't change a lot drastically, because it is too hard for me. I just look at one bad thing I am eating/drinking (say too much pop) and try to cut back or eliminate it and then continue from there. Not sure if this makes sense or helps. I hope you feel better soon.

For me, the best way to deal with stress is exercise. Not only does it help take the "edge" off of things for me, but it also gives me a more "calmer" feeling and better attitude towards myself and life.

In terms of changing your eating habits, I guess it would depend on what your diet is like now. Adding more fruits and vegtables while eliminating "junk food" is obviously a good place to start. Drinking water or fruit juices in place of pop would also be a big advantage.

If you increase your level of exercise, having a healthier diet that gives your body the "stuff" it needs will improve your exercise experience.

Your friend is correct that stress can weaken your immune system and a weak immune system can lead to more illnesses. Thus, along with getting more exercise and improving your diet, also ensuing that you get adequate sleep will help your overall health.

I hope that you are able to make some lifestyle changes so that 2009 is a heathier year for you.