Earlier quoted context omitted.
Assuming that by "4:2" you are talking about intermittent fasting, does anyone believe otherwise? Alternate-day fasting can help people lose weight not because there's any magical effect, but because a faster is unlikely to double their calorie intake the day after fasting - having fast days is just a simple/easy way to reduce overall calorie intake. Besides, the main benefits of alternate-day fasting are meant to be…
It is marketed as a diet. however its based on the idea that if you have a reduced calorie intake you'll live longer. However: a) its yet to be proved in humans (worms, flies and lemurs, yes.)[1] b) to get the benefit we're talking about ~1800 calories a day. Having accidental done something like that for almost a year, I cannot stress how terrible your quality of life is. [1] http://www.nature.com/nature/journal/v43…
In response to your point b), presumably you mean the deficit is ~1800 kcals per fast day? Why was this so terrible?