Should I Eat Whatever I Want Or Still Watch Calories?

I Wanna Loose A Lil Weight. My Cousin Use To B Chunky Now He's Skinny. He Said All He Did Was Not Eat After 7pm? I'm Starting Not To Eat After 6 and Am Barely Noticing The Difference. My Ques. Is.. Shuld I Eat Whatever I Want?? Or still Watch My Calories Even Tho Ima Stop At 6pm