I understand! I did a weeklong trip in Utah's Escalante last Spring and came out with probably 3 days' worth of food. I'm sure I could forego eating for a day or so and still be fine. Just dead weight to lug around! Stupid light means taking ultralight to its ridiculous extreme, sacrificing comfort or even safety for weight reduction. An example might be not taking raingear to save 8 oz, but suffering through days of cold and wet on the trail. In that example, one could easily be at risk for hypothermia, all for saving a half pound. That's the very definition of "stupid light!" The other side of that coin, of course, is to carry a 70 lb pack with redundant clothing, a too-heavy shelter, and all sorts of electronic gadgets. There is a balance point, and the best way to find your ideal place is to gain experience and skills. With that, I would recommend taking as many "shakedown" trips as possible, in all conditions, to test out gear and packing options. Be sure to take notes, honestly critiquing gear and your fitness levels. Find out what works and what doesn't. At the end of each trip, list those items carried but not used. Better yet, put them in a pile as a visual aid. On the next trip, don't pack them! Use a scale to weigh all your gear. A side benefit of this approach is that you will be conditioning yourself in the process! As I have stated when asked, "How do you train for hiking?" By hiking! If you have time, hike some of our most demanding trails with your full kit. Taum Sauk, Bell Mtn, Ketcherside Mtn, Rockpile Mtn, etc are all excellent training grounds to test gear, improve nav skills and test your own mettle. As you dial in your kit, you are conditioning your body, as well as seeing some of the best landscape in Missouri!
If you peruse the various websites and forums dedicated to thru-hiking, including BPL, Whiteblaze, Andrew Skurka's blog and many others, you should get some excellent pointers on gear selection, packing techniques, support options and menu development.
Keep us apprised of your progress!