Day and Aristotle

Good evening!
1- Ostensibly, Yom’s claim that a proper cannot be deduced from a given assumes that there are no ‘ideas’ in reality, since this is his claim itself – that since it is impossible to observe ideas, in any case both science (induction) and ethics are the fruit of man’s own structure and are not claims about the world (and are equivalent to the claim that I must eat because it is moral. In other words, it is not morality that demands man, but necessity).
That is, one cannot speak of values ​​that are not objective ideas that are external to reality (transcendental) and certainly not the complex facts of reality.
And so, K. Lee, how did Aristotle, who denied the existence of ideas beyond reality, manage to posit a binding ethics, and is he right in saying that one cannot speak of value solely from the existence of facts (i.e., the non-existence of ideas)?
2- Kant claims that man must be rational. And why? Is it because it is a way to live well. That is, as someone will tell me what the best way to eat is. Or is there something beyond that? That is, self-actualization is more than a description of the existence of a fact (after all, we do not call someone who has the potential to eat and does so, that he has realized himself, albeit cynically of course…)?
3- Similarly, Kant argued that ethics stems from morality. What is the connection?
Thank you very much!