How old are you and what is your body type/how is your metabolism? What do you drink during the fasting days? How long do you, can you, or did you fast?
Before I even or ever started thinking this was a good idea, I did it, but I blamed stress.
It worked and I felt interesting but I did not "fast" for long at a time (15 hrs max probably), and I definitely don't really like the sensation anymore now. I have always been lean, and I never liked eating cooked animal fat (only raw or for example prepared with herbs and in brine and kept in cold like they do with pig fat/ham) so my body doesn't have much stored to both be active/have an alert mind and not eat anything. 22 here. Impossible for me, unless I ate a lot for two months and fasted the third or something like that, with the requirement that the food was highly nutrition/good/and not much processed or prepared from shitty "mistery dust" in factories. Or maybe in a very cold country especially during winter, as I tend to get cold easier than others when temps drop and that would spark some metabolic needs. Another way would be if I had the most relaxed time of my life and didn't have to think much, as the brain takes it all . I also think that in developed countries and especially in the west, the access to organically grown, highly nutritious VEGETARIAN foods is limited, and is one of the downsides of food mismanagement/waste and lack of recycling. Same for very developed cities, where you're left with healthier animal alternatives unless you have an impressive income and afford to buy all the imported quality goods. So it comes down to sensitivity (physical or emotional/related to heightened perception or manifesting medical condition) towards meat etc more than anything else to make you quit eating meat given the above factors.
I'm not falling for any pre packaged "healthy veggie burgers" & "drinks" and I oftentimes find the smell of bottled "original indian sauces/mixes" awful. In fact, unless you're getting your soy milk from some kind of special farm or big asian store directly, there's absolutely no soy milk alternative commercially sold that has over 8% actual soy milk, and it's processed. Yet another trick on the market to fool people to drink what is essentially flavoured water with added lab vitamins. I still prefer full fat milk (4% or more) over skimmed highly heated homogenized etc etc milk. I'm still firmly convinced it's the processing and heat treatment of everything that makes a product bad, as in the original state it comes with all the good stuff (boiling unpasteurised milk from a cow is a must though, of course, for safety reasons, unless you can test it everytime and make sure it's safe). But then you remember about the "lovely" food they eat and hormones/antibiotics they receive... way to go, capitalism. Not one should be falling for the "but otherwise there wouldn't be enough for everyone" either as that is a fictive excuse and people have always had more than they can chew, but greediness stood and still stands in the way of sustainable progress. Sure, there were some goat and sheep (commercially viable) alternatives, if you buy directly from farms, which are a bit better than cow now days, but depends.
But you (or anyone) shouldn't be discouraged from becoming vegetarians by what I write if you know you do have healthy alternatives where you live, of course. For "reference" purposes, I've only lived and travelled through Europe : )
updated by @kate: 08/31/18 02:42:49AM