Counting calories helps with weight loss

I recently bought the Tap & Track app for my iPhone. So for the past week I have been tracking calories I consume and calories I “earn” with exercise. The idea is similar to what I was doing with Weight Watchers. I just decided to try something new. Plus I always have my phone with me.
In a week I lost 3.6 pounds. I think part of that is a fluke–since last Monday (Oct. 19) when I weighed in was the morning after sushi. Though I did drink A LOT of water all day Sunday.
I will write more later about how much I love this Tap & Track app.