Solely using a sauna suit to sweat will not speed your fat loss goal, nor will it reduce belly fat. If you combine the use of a sauna suit along with a balanced diet that is catered to your individual needs, along with regular training and exercise then you will see fat loss over a period of time. Solely using a sauna suit to sweat will not speed your fat loss goal, nor will it reduce belly fat. If you combine the use of a sauna suit along with a balanced diet that is catered to your individual needs, along with regular training and exercise then you will see fat loss over a period of time. It is often seen as a myth because you lose weight quickly through perspiration and sauna sweat that this is permanent and can be achieved easily.