Hi Virgo.

The Fat Smash Diet is, as I understand it, a diet that encourages very healthy eating habits which include a lot of fresh veggies and legumes, and limited amounts of lean meats and fruits (after you graduate to some of the later phases of the diet). At first there's a very rigorous detox segment of the diet which always seems to produce great results, but your food choices are extremely limited.
There is some great info laid out in the stickies at the top of this particular section of the forum (the Fat Smash section),
this thread in particular. Feel free to browse and let us know if you have any questions.