I live such a frugal and abstemious life already that I can't really see anything to give up. So, I've dusted down my hair shirt and I'll wear it for the next 40 days.
I remember that old song we used to sing in assembly in Junior school - first line was '40 days and 40 nights, thou wast fasting in the wild'. Had a jolly tune as well.
To all the religious...I bet that Pancake tastes so sweet in your memory now!
Personally I'm doing nothing different. Religion makes no sense to me and has no influence on my life.