Ice. Eat lots of it.
Ice is cold. Brrrrrrrr!
When you eat it your body has to melt it, then heat it. Takes a lot of energy. Energy from fat.
To melt 1 kg of ice takes 334000J and to heat it to body temperature takes 154660, a total of 488660 J.
I kg of human fat contains 37700000 J .
Therefore to burn up 1 Kg fat you could consume 77 Kg ice. Do this every day and you will be slim in no time.
A better diet than the one that involves you vaporising food and inhaling it.