We often think fasting is only about food, but as a Christian practice, it can encompass much more. It can also be abstention from things that occupy time that would be better spent on our relationship from Christ: TV, video games, surfing the Internet, etc. How might you use the time away from that activity to focus on God?
Fasting in relation to food can take many forms: giving up a meal or choosing simpler foods. Rather than simply giving something up, pray as you fast and remember those who hunger and thirst in this world, and donate the money you would have spent for that meal to a hunger-related cause.