If that AI would give us only bio food and state of the art treatments would we work the same way as today for the economy?
Maybe this acceptance of killing with food is just a strategy to obtain only better people to become cyborgs that also have better genes and can stop eating what is not good without being forced by some robot.
From his point of view might not be in his interest to give us at this moment this resources, when he can use researching power to improve itself.
We allow to die from junk food, because we buy it, nobody forces us to buy it.