It surely depends on the type of fruit and details of the juicing process, but I've seen references to losing vitamins. flavonoids, phytochemicals from the skin and the pulp when you juice, as well as the more obvious fibre issue.
Fibre is your friend 🙂
As you say, it's really a 'depends' thing. Removing all of the fibre does indeed take along a certain quantity of the nutrition with it. Juicing at home can mitigate this loss as it actually takes extra work to get rid of all the fibre. And it's also possible to add some of the fibre back, if desired. Buying store bought does change things, especially if pasteurised.
On this occasion, I'm doing off-the-shelf pasteurised juice. I do own a juicer, but at this point in time i'm deferring to convenience. I also want to prove a point
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And we definitely agree on fibre. I believe it's extremely important. However, while there are benefits to fibre other than the promotion of proper gut/intestine motility, it's worth considering that when no solid food is being consumed there's nothing to bulk up and move. I've done many extended fasts and periods with no solid foods, and have always experienced full bowel movements till at least a few days into it. After that, well...never trust that a fart is just a fart
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Ultimately, this is only going to be short-lived, although I do plan on doing a proper extended juice 'fast' once I get a bit more control over my sugars. Besides, juicing is only a part of this. I am still eating whole fruit, as well as one cooked meal (Managed to get 23 grams of fibre yesterday, despite being pretty low-calorie).
Here's a video that might be of interest. I'll caveat by saying that I don't necessarily endorse all the views expressed. Also, I know these people are not diabetic. Lastly, I'm not suggesting this is the (only) way, and I'm certainly not advocating that anyone here need do anything like it. However, I think it's good to see what fruit juice (Just as bad as Coca-Cola, apparently) can do: