This is a somewhat silly question, but I'm sure it has a good answer and I'd like to know what it is.
Unfortunately, I was hospitalized recently and I ended up being in hospital over Yom Kippur. (Everything ended up perfectly well in the end.) At that time, they were mostly just doing tests and keeping me under observation, but I did have an IV drip so they could give me some medicine and rebalance my electrolytes. Anyway, since I wasn't that sick at that point I asked the doctors whether it would endanger my health to fast and I was told 'we need to keep the IV drip in anyway, and there's no medical obstruction to you fasting if the drip is in place'. So I fasted.
As you might expect given the physiology of dehydration, fasting with an IV drip in made for the easiest fast of my life!
Now, obviously in this case there was a genuine medical reason why I needed to have the IV drip, but it got me thinking: would it be allowed for a completely healthy person to put themselves on an IV drip (before the start of Yom Kippur) and then keep the drip in throughout the holiday. (Just so as to make the fast easier.) To focus on the core of the question, let's suppose that the person in question holds a medical license (so can put a drip in completely safely), has all the equipment in hand to put the drip in themselves, and lives in a country where there are no medical licensing laws so wouldn't be breaking the secular law by doing this.
It feels like the answer to this question must be 'no', but I couldn't work out what the reasoning would be. Could anyone enlighten me?
(I was constantly thinking that if Dr House was Jewish, he probably would do this every year!)