Trusting your body is not good for long term health. You seem to understand this because you say that chocolate ice cream is bad. But if we have a system for overriding bad instincts like in the ice cream example, then why would we trust those instincts in the first place?
I’m not saying your cravings can’t be onto something ever. Your brain can probably make the connection between some nutrients and some foods, but even in those cases this instinctual part of your brain does not know the most efficient and healthful way to replenish those nutrients. Like hypothetically if donut sprinkles contained iodine and someone craved a donut because they were deficient in iodine it would not suddenly be good to start eating donuts, and their brain might have not even made the sprinkle connection but just a more general donut connection.