No matter what lifestyle you're doing, try this for a week.
Eat at home. No fast food, no processed food. Buy real, actual ingredients and cook yourself fresh food. Count up how much you saved by avoiding restaurants and candy / chips / sodas / etc. Then donate that extra money to your favorite charity.
I know that many of us are on tight budgets, and don't have extra money to donate. But even a few dollars can help, if all of us do it. Clip coupons, check the circulars for specials, and try to eat at home just for a week. That small savings can really mean a world of difference to those in need.