Okay, here's a weird thought: I saw an article discussing a fad diet where people will get a nasogastric tube (tube down the nose into the stomach) for 10 days and consume a low-calorie protein slurry instead of eating. The idea being that you'll quickly induce ketosis and lose a lot of weight.
Now, I'm not really interested in weight loss, and this seems to be a bad approach for that, at least technically if not morally. However, I'm wondering if there might be long-term applications, allowing you to not have to eat. According to people on the diet, they don't get hungry; bypassing the mouth seems to reduce (even eliminate) hunger.
To be clear, there are a lot of concerns. Long-term use of nasogastric tubes can cause tissue damage, ulcers, and unpleasant discomfort. You'd also have to carry around a pump with the food (slurry). Also, I'm not sure what the long-term impact of cutting fiber out of your diet might be. On top of all of that, I often enjoy food, and I'm not sure if it would still be possible to eat with it installed.
So I guess I'm just wondering if anyone has attempted this, has put any serious thought into doing something like this, or really just what people think of it as a general concept.