This is an interesting thread, as much for the content and debate on topic as much as it is for a bit of people watching!
I am doing this to reduce the 25% free body I have at the moment and would chip in with the following:
1, Eating less on 2 days of the week may be helpful for some people, based on the fact that for some 2 days of high effort is easier than 7 days of consistent “dieting”
2, The fast days seem to make you think about food in a different way, basically a better understanding of the calorie content of food to keep to the 600 calories means you are less likely to blow loads of calories on the other days
3, I think there is also an emotional investment in that on fast days you put effort in, then you are less likely to make poor food choices on non fast days (weight watchers is successful partly because of a financial and group investment like this)
4, I am not sure about the claims of this diet replicating a more historically appropriate diet (early man struggled to get enough food). But there does seem to be some positive markers e.g. Leptin etc in studies suggesting that this way of eating has physiological benefits.
Hope this adds to the debate!
OP One of the things this diet may do is help you “listen” to your body, if you are shaking / bonking then clearly food would be a good idea! Protein is digested slowly and may help?