Lanefan
Victoria Rules
If we were to call our points "Wound" and "Vitality" instead of Body and Fatigue, we'd be doing the opposite of what you suggest here. Vitality (i.e. Fatigue) are easier to rest back and-or cure than are Wound (i.e. Body) points.This "Vitality" pool would also only come back slowly. I wouldn't do 1/week myself because I consider that overwhelmingly punitive, but different groups could certainly go for varying rates at which they're recovered. No HP healing, or at least none of any meaningful/repeatable source, could be had unless you have Vitality to support it. If you want heals, you need to spend Vitality to get it.
In this context, the Vitality pool could not be restored by spells. Nothing--nothing at all--except rest could restore them, though maybe you could use magic to exchange them between people. And if you run out of Hit Points while your Vitality pool is empty...good luck!
They're not two separate pools, as @dave2008 seems to have. Rather, your Vitality points sit on top of your Wound points and (with extremely rare corner-case exceptions usually involving loss of a limb) you don't start taking Wound point damage until you've run out of Vitality points.
A combination of species (which sets the die size) and your Con score (which sets a floor) determines how many Wound points you have; this is rolled once and that number - again barring extreme corner cases - is then locked in for life. For example, a Human rolls a d5 for Wound points while a Dwarf rolls d6 and an Elf rolls d4. Con higher than very low sets a floor of 2, meaning if your roll is 1 it becomes 2; Con 15+ sets that floor at 3 instead. Actual Con bonus does NOT apply to this roll.
Then you roll your hit points by class and these become your Vitality points. So, a Human Fighter with 16 Con rolls a d5 for Wound points (with possible results 3-3-3-4-5 due to her high Con setting a floor of 3) and then rolls d10+2 for Vitality points. If, say, she rolls 4 Wound and [5+2=] 7 Vitality points total, she will start at 1st level with 11 hit points.
This also helps with the meat-luck divide: Fatigue (Vitality) points are mostly but not entirely luck - there's always a small 'meat' element - while Body (Wound) points are, as the name would suggest, entirely meat.