How did you lose your belly fat? How often did you workout, what kind of exercises did you do etc.
I agree, a healthy balanced diet is key. Try apps that are focused on diets, they help, A LOT!
If you are losing weight instanly and you are concerned about the your beely where extra fat gets collected then you need to do a couple of things. One of these is to do some form of weight training to stop the loss and recover the muscle mass and eat protein commensurate with managing this.
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Do Workout abs it's really work