ATB I have no experience on juice fasts ,although I do have a juicer and have in the past enjoyed making my own juices (ive not been doing so since starting 5:2 )
Fruit Juices can be quite high calorie (I cant imagine anyone would just want to have vegetable juice) and I think that if you are going to eat fruit then eating the entire thing is better for you s the Pulp/Fibre helps slow the digestion helping you feel full longer and slows the blood sugar rise and insulin resistance which helps stops big swings which can lead to feeling hungry.
According to a source on the net carrot juice is 94 calories per (US) cup, apple juice is 117 per cup. So would be hard for a fast day (although of course you may not be wanting to combine the two), but I think the main problem would be the hunger swings..
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Below Ive found a few articles which may help. (but they are all negative)
Livestong
Dr John Briffa
an article about juice detox
But In the absence of TIP(who is very good on the science stuff ) ill ask (as I think she would) Why do you think this approach will help? (I also think she?d be with me on what i?ve said above) you can ask her though ..shes here
And perhaps unlike TIP... ill say .... if you want to give it a go for a few days .. then why not? But It doesn?t sound right for me and I don?t think I would in your position as I think i?d just be constantly wanting more and could see me feeling acidy and faint on this ( which I don?t on5:2),also if you are using up a lot of energy cycling.. that might not be good. But then again a few days of liquid fast might help you feel a bit better ...and you can always come back to 5:2.
Right, I read the stuff about Setpoint TIC and that very interesting..I?m wondering if that?s where I am , right now.. if so I can live with it ,as long as I can maintain for a few months.. then maybe have another push then..
I?ve gone over a bit again today (about 650) , but that not too bad .. Just off to Shred..and will put extra effort in ..maybe up the weights to my 2lbs ..I?m also finding it easier and quite looking forward to shred level 2 now ..