Actually, I hesitate to call it a 'diet'.... And the authors would concur. but it's difficult to know what to call it.
In a nutshell, a person would restrict their calorific intake for 2 24-hour periods per week, and eat 'normally' the remaining 5 x 24-hour periods....
I describe it thus, because the 24 hour periods can be consecutive, should you so wish, or a good period apart; they can run, depending on commitments and lifestyle, from 2pm one day until 2pm the next....
In other words, these 2 x 24-hour periods are for you to adapt and use according to your schedule.... they don't have to be an actual 'day' and they certainly do not have to be the same days, every week.
My personal regime consisted of reducing my calorific intake to 500 (ladies) or 600 (gentlemen) but then I also was very mindful to eat no more than the recommended daily normal calorific intake, the remainder of the week.
the 2 days are promoted as 'plant & protein' days - NO carbohydrates, or severely reduced, and eating in the morning and in the evening.
Some days you might slightly exceed your recommended intake; another day, you may go slightly under. But as long as you are 'thereabouts' it's ok.
The book even gives daily snacks, to tide you over, but again, the calories have to be taken into account....
Of course, the delicious recipes can also be adapted for the remainder of the week, and you can add things like rice, or noodles, the odd potato or small slice of bread....
I was concerned that reducing calories to such a basic level would leave me hungry with aching pangs in my stomach, but of course, this didn't happen.
And Fasting is a global practice for some faiths and creeds; such as Ramadan for Muslims, and we too as Buddhists, are encouraged to occasionally limit intake.
I have come to realise that feeling hunger pangs is not dangerous; it is ok to feel hungry for a while. And of all the creatures on the planet, we are the only "Animal" which has regimented its own intake to 'three meals per day'.
Even zoos both vary the times they feed animals now, and even avoid feeding certain animals for a period of time, by emulating 'in the wild' conditions....(we would do well, by the way, to do similar with our own beloved domestic pets!)
Also, i find i drink more water; if i feel hungry, I take a pint of hot water, with one teaspoonful of apple cider vinegar.... If after 20 minutes, I still feel hungry, my body is requesting something more solid. But often, the hunger pangs disappear. My body needed water, and as such, once sated, the pangs disappear.
So this is not so much a diet, in the 'must lose weight' sense... it's more a diet in the 're-think, re-education' sense.
I recommend it. It works well.... Providing you follow the thinking behind it.
it is well-presented, expertly researched and I found it to be extremely beneficial.