Amount of juice intake
Here is my take on this:
When on a reboot that vast majority of our calories are carbohydrates, and the differences between how fast the body turns them into glucose isn't really a concern while juicing. In the overall scheme of things, the sugars in the juice doesn't really add up to all that many calories, and blood sugar problems are not an issue for those that are not diabetic. The caveat to all of this is assuming you don't drink a gallon of juice in one setting. The recommended "serving" size is about 16-22 ounces, but I don't even drink that much at one time. I can't chug a pint of juice without throwing up - it's just too much juice at once. I usually drink about 8 ounces at a time, often less, and I drink it whenever I feel like it.
Can we drink too much juice? Yes, but our bladder capacity usually stops us from doing that. HOWEVER as we progress into the reboot, our metabolism slows a bit and depending on how active we are, we sometimes find that the juice we consume provides us with enough calories to prevent significant weight loss. When that happens to me, I cut back on juice, sometimes to around 600 calories a day. As a med student, you might shudder at the thought of someone consuming 600 calories a day, and it certainly is not sustainable in the long run, but a reboot is a short term thing - it stresses the body, but not unduly so, and it's only for a few weeks.
So if the scale stalls for day after day after day, I cut back on the calories, and that gets it moving again.
And yes the cravings on the first reboot, especially during the first days, can be BRUTAL. In time you get used to it, but for the beginner juicer it can be truly miserable. Especially at night.