My wife and I have both answered several people when the asked how I have lost about 40 pounds. Usually I tell them that I walk about an hour a day, ride my bike around 20 miles/day, count my calories and try to limit them to about 1800-2000, I eat lots of fruit, almonds, fish and lean meat, cut down on carbs and don't eat chips, candy, or ice cream. This is usually meet with a mutter of "I didn't want to hear that." Now I understand being in denial about your weight. But they act as if I have some crazy special pill that is super secret or something that I am refusing to share with them.
It kind of reminds me of one time my wife made cookies for an office party. Someone asked her for the recipe, my wife said it was on the bag of chocolate chips and the person got miffed at her for not sharing her recipe.