Why is a diet devoid of nutrition bad? I am fully grown, about to turn 21. My body is entirely developed which is why it sees fit to be 'reproducing' all the time.
Come on man, think it through. You literally can't live without nutrients. This just isn't a long-term viable solution. Maybe in the short-term by reducing nutritious food this reduces your libido, but your libido won't be the only thing checking out long-term...
The whole point of this is so you can be happier, right? I can assure you that over time as you develop more nutrient deficiencies, your happiness will degrade significantly. Your brain literally requires B vitamins and all sorts of minerals and nutrients to manufacture neurotransmitters, including serotonin, the feel-good hormone.
That "state" that you experience when you abstain for a few days - it only feels good because your body has actual nutrients to produce the correct hormones, mood etc and to also recover from the POIS state. Once you run out of these nutrients, you will really begin to feel the negative effects, especially on your mood (even outside of POIS) and on POIS recovery.
I can tell you from one POISer to another, the thing that has improved my POIS the most is actually doing the opposite of what you are thinking of doing. Replenishing nutrient deficiencies has fixed about 99% of my symptoms. I still get some symptoms from food, but I'm feeling very optimistic that if I can give the body what it needs, things will continue improving.
Why don't you try what I suggested earlier to reduce libido? Low-carb, pescetarian or vegetarian, stay away from "heavy" foods like red meat/eggs, and maybe do work that is physically or mentally exhausting so that your body doesn't have the time or energy to think about sex. That last point is what a lot of what people in the semen retention community do. You can also try sexual energy transmutation practices like pranyama and breathwork to move the sexual energy away from the crotch area.
I abstained off and on for years, but admittedly did not run into the wet dream problem. But I understand very clearly the frustration. I just don't think restricting nutrition in the way you're talking about is smart. I really wonder if you undertook the regime I spoke about above, if this would reduce your wet dreams.