Is there a replacement for the removed "Simple Nutritions" mod? Preferably one that also does away with the stomach contents / obesity update? I thought about getting back into Cataclysm, and while I can live without most of the mods that got axed, that one is not one of them (together with "no fungals", which luckily still remains).
Sadly, no. Note that, last I checked, malnutrition still does basically jack shit, so that can still largely be ignored. However, there is a very easy solution to the hunger problem, at least when it isn't being a buggy mess: Hungry is Bollocks.
Only eat when Very Hungry or worse. If you do that, you'll eventually settle into a rhythm between normal weight and the very first category of overweight (which is harmless). You can technically even ignore Very Hungry for a while without issue, but that requires you figure out WHEN it's no longer okay to ignore Very Hungry, and you'll be hovering between normal and the first category of underweight instead. Since the former approach is self-correcting (just don't eat unless it says Very Hungry) while the latter requires you to actively overeat to correct it, I advocate the former.
That is, again, assuming it's working right now. There were some issues with stomach capacity, some UI issues where drinking would update your hunger status in a confusing way, a bug where you were burning 7000 calories a day doing fuck-all, etc. I don't know for sure if it's CURRENTLY as close to functional as it's expected to be, or if any notable bugs are still present.