“At one time the Rasul of Allah said to his cousin ‘Ali, ‘O ‘Ali, you should not eat meat. If you eat meat for 40 days, those qualities will come within you. Because of that, your human qualities will change, your compassionate qualities will change, and the essence of your body will change.’ “
Another version is:
The Prophet (s.a.w.s.) reportedly said that one who does not eat meat for forty consecutive days will waste away, whereas to eat meat for forty consecutive days will harden the heart. In other words, one should moderate the intake of meat.
This one actually mentions two ahadith: one about eating meat for 40 days, and one about not eating meat for 40 days.
I didn't find a reliable source for this hadith, nor was I able to determine its level of authenticity.
Question: What is the authenticity of this hadith?
(I asked about the other hadith here: What is the authenticity of the hadith "do not make your stomach a graveyard of animals"?)