Weight loss

In the last couple of months I have been able to drop about 12 pounds.  What have I done?  One thing I have been doing is for lunch eating fruit, mainly bananas, apples, and grapes.  Some days I will substitute a weight loss shake for a meal.  I am still walking about four days a week.  My total for the year so far is just over 200 miles.  That is dedicated walking where I keep track of my miles.  I also bought a pedometer to see how many steps I take in a day's time.  Today my reading was 10,100 steps, or roughly five miles.