I'm dieting the old fashioned way - exercise and reducing calories to about 1800.
My friend recently told me about a diet she's thinking about doing called "The Alternative Day Diet". In this diet, you eat 400 cals one day, then you're allowed to eat whatever you like the next day, then back to 400 cals the next day, then eat whatever you like for a day, etc.
I've done some research on this seemingly popular diet. Apparently it switches on a 'skinny gene' which keeps your metabolism in top condition, burning calories. It also has other claimed health benefits such as - making you live longer (there was a Horizon documentary on the BBC backing this up). The internet is full of gleeming reviews.
But surely this pattern of eating is unsustainable and encourages disordered thinking? I feel a bit concerned for my friend. When she latches onto an idea she tends to go hardcore.