Yes, I feel better if I don't eat (though when I eventually eat I crash so it's an energy loan that has to be paid back).
A few months ago, in order to level my blood sugar I started eating a bit more meat, especially for breakfast, and ended up eating bacon. It took a few weeks to realise how poisonous it was to me. In the months since, I've also realised that meat in general (and animal fats more broadly) seem quite harmful, though to a lesser degree than bacon for whatever reason.
So in Dec I pretty much stopped eating meat, and my meals now are based around vegetables, lentils, eggs, beans, soya, and fish, with very limited (almost no) dairy (I don't eat many carbs). This diet has certainly not fixed the ME/CFS, I don't think any diet can based on my experience, but it has certainly moved me a notch up the scale. I used to be 4-5/10, but now 5-6/10. I find my energy levels are a little better, but my head is also noticeably clearer. ME/CFS is telling me to eat very simple food, and less food generally than I used to eat.
I do not know why this diet helps. My best guess, and it is a guess, is that digesting meat produces more oxidants than eating a simpler, plant-based diet, but I expect it could also be because animal products cause immune responses, or that digesting animal products just uses more energy. The nice thing about the new diet is it's simpler - if I'm not able to cook, I can throw a tin of mixed beans in the blender, maybe warm it up, but just drink it. Quite a lot of my meals are blended protein and veg combos now, e.g. lentil, bean and root veg. I normally through a fair amount of salt in to nudge my blood pressure to a more normal level.
I'd love to know why food is causing such problems, as I expect I'd be able to refine the diet more.