I understand your position here, but I still have to disagree. You smuggled in a value-laden concept in the second paragraph: "unhealthy."

"Due to your knowledge of the unhealthy consequences of ice-cream, this will likely reduce your valuation of the good."

"Knowledge of the unhealthy"

=

Knowledge of a negative

Without objective value, what differentiates health and unhealth?

Perhaps by "knowledge" you are referring to a mere opinion or preference, but it sounds like you don't mean that. It sounds like you are talking about knowledge of an objective fact.

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It makes no difference. The important thing here is you see it as unhealthy, or what ever you mean by 'not good for you'. We are talking about value theory, not whether knowledge of the reality is possible.

But yeah, the important thing, as you have identified, is *you* see it as an unhealthy choice, not that it's possibly an objectively unhealthy choice.