For reference, here's the complete history behind that:
- Some guy named iguana started making little hardcore tweaks to vanilla, a lot of them were directly inspired by BTW, a lot of them weren't (and pretty good, so he's a decent designer in his own right)
- People mainly liked his hunger overhauls, the mod was used in a lot of packs
- Iguana stopped working on Hunger Overhaul, and it was pretty much a hack job anyway, so people took over and rewrote it from scratch, with a fun new API called Apple Core that allowed different hunger tweaks to work together.
- This mod became pretty popular, but it also strayed pretty far from its BTW roots. What you decide is similar from a screenshot is actually not that similar, and I'm willing to bet money that the one making those visuals doesn't even know BTW. He just needed a way to express vanilla saturation and made the outlines colored, that's not a grand idea. Mechanically, hunger overhaul does not use BTW's concept of fat at all.
- I use the mod in all my personal packs, as I think it's really fun :D
Old Iguana's mod
New Apple Core mod
As you can tell, there's now three mods running on Apple Core:
Hunger Overhaul - Extensive tweaks to hunger and related mechanics (the original iguana mod)
The Spice of Life - Encourages dietary variety through diminishing returns
Hunger In Peace - Normal hunger and health regen in peaceful