[rilezg]

Grocery stores are incentivized to sell as much food as possible, which does not align with keeping their customers as healthy as possible.

But, assuming altruistic grocers, it would be interesting to see how they decide what food to steer people towards. Would I have to share my medical records and height/weight/exercise routine or would they personalize based on something else?

[Ekaros]

Or otherwise generate the best possible margin. Either by volume or by price. They might optimize slightly differently, but never for the best of the consumer. That is they will aim to generate as much as possible in total sale value and on other hand have as high as possible margin with the that value. Think of health-insurance, not exactly great for consumer.