I am an amateur athlete who has lost 60 lbs. in the last 18 months. So far, I've been able to keep it off.
One of my many, many strategies for managing my weight, besides being much more active, is to make changes to my everyday eating habits. One of these is to treat myself to a frozen protein mix every few days. As the platform for this, I've used a variety of protein powders and nothing beats plant based protein for taste and low calorie density.
When I mix up Orgain in the vanilla or chocolate flavors (they have a new peanut butter flavor, which people are going to love, but I'm not a big PB fan...) with ice it tastes almost as good as ice cream. I can mix in some coffee, semi sweet chocolate, etc., fruits, etc., and get something that is low in calories, high in healthy protein, and tastes fabulous.