That won't help much because the quantifiable material loss in that scenario wouldn't be much.
So is your suggestion that medical policy based on balancing humours is actually effective altruism?
Our current policies favor fearmongering and cherry-picking to influence people to seek medical treatment that they don't need and come with side effects.
The fact that Doctors get paid a kickback for high child VAX percentages alone is enough to make me toss out the whole idea.