For me one of the most interesting things about this way of eating (I won't call it a 'diet' is that I find I am less hungry on the normal eating days. This came as a complete surprise and a nice one, because as a former carb junkie I would have expected to blow out on the 'normal' days. Instead, my body seems to be learning new habits. I first started this way of eating with a one-week vegetable purification diet on a Polish health farm. I have type 2 diabetes and a week of eating just veg, no bread, sugar or refined carbs, and no fats, normalised my blood sugar completely. Since seeing the Michael Mosley programme my DH and I have been doing the 5:2 thing intermittently and we both feel it's a good way to eat as we are getting older and don't need so many calories. On a fasting day I start with a half-size portion of my normal muesli, a cuppasoup for lunch and a boiled egg and crispbread at supper time. Not too difficult, and definitely worth it.