I agree with the above in a way but would extend it as follows;
If a human do not eat, he will die.
If all humans don’t eat, the whole human specie will be extinct.
DNA wise all humans are programmed to survive at all costs till the inevitable to ensure the human species is not extinct. [exception exists only when the program is defective].
Thus all humans ought to eat.
This ought is derived from “is”.
This ‘ought’ is reasoned out from facts, i.e. “is”
To reconcile the ‘is’ with ‘ought’ we can verify it with a scientific experiment [i.e. empirical is].
We can do this experiment by taking a sampling from the full range of humans on Earth, e.g. in terms of gender, age, race, countries, states, and all other demographic sectors.
Then we ask each the following question,
“Will you volunteer to kill yourself to death?”
Common sense will inform us no ordinary human will answer ‘Yes’.
Those who answer ‘yes’ would likely be the mentally ill due to defects in their DNA, e.g. the certified heavily depressed suicidal person, and other mentally ill. The % of these people are like to be very minimal.
The above experiment and question can be extended to every ordinary human on Earth.
Common sense again will inform us, all will answer ‘No!’ [note exceptions as explained above]
From the above and imputing the Golden Rule, we can derive the primary ‘ought,’
“No human ought to kill another human”
From there we will be able to derive a hierarchy of ‘ought’ with different weightages and values.
The origin of Morality is driven by the survival instinct [till the inevitable] and an inherent Faculty and Function of Morality within the human brain/mind that is slowly evolving just like how the human faculty of the reasoning and planning executive function had evolved from eons ago as distinct from the primates and other animals.
One of the parts of the brain that support this faculty of Morality are the presence of Mirror Neurons working with other parts of the brain.
The point here is while it is possible to reason out an ‘ought’ from ‘is,’ that “ought” as an ideal should never be enforced upon anybody but merely to be used as a GUIDE only to facilitate continuous improvement of narrowing the moral-ethics GAP.
The above are in accordance with Kantian Morality and Ethics