Quote:

---

Is there a way to make villagers healthy before they actually get sick? I've tried dragging them over to eat or drink well water. If I try to heal them before they're sick they think I'm trying to get them to breed.

---

There isn't much you can do to keep them from getting sick. Having enough food on hand is a great start though!
As soon as you see your villager with a "sick" label, get another villager to heal them. (preferrably a doctor!)

If thier status says "weakened" there's nothing you can do to fix this. keep plenty of food on hand and they will hopefully get better soon!

Here is a link to another thread that may explain all of this better: this post