Weight Is Increasing Again

My weight is increasing again. I have stop my diet since last years, my weight was maintain the same last few months, but this month it is increasing again! I wonder is it because I over take those fat food or what. Maybe is time for me to start my lose weight program again. Anyone try hydroxycut before? I heard about this before but none of my friends tried this. I am quite curious is it effective on losing weight or not. If they real good in lose weight, I may consider having it a try this time.