How did Moshe Rabbeinu survive in heaven for 40 days and 40 nights without food?^[1]

The Torah states that Moshe entered the cloud above Mount Sinai in order to receive the tablets and remained there for 40 days and 40 nights and did not eat nor drink throughout the entire period of time. Now, it is not possible for a mortal being to survive without eating and drinking for 40 days. So, what did he consume and what was his source of energy during his stay? The explanation is as follows: The same way that there exists physical food so too there exists spiritual food and hence while Moshe did not consume any physical food throughout his 40 day stay he did consume spiritual food from which he derived divine energy which gave him sustenance similar to physical food. He consumed the same food as the Angels which is spiritual in nature, known as Lechem Abirim. Now, how is it possible for a man of flesh and blood to receive physical sustenance from the spiritual foods of the Angels? Through the cloud that Moshe entered. The purpose of this cloud which Moshe was concealed within was to serve as a medium between the spiritual energy of the food of the Angels and the physical body of Moshe. This cloud was rooted in a very high level of G-dliness and descended below in order to transform into a garment for Moshe through which he would be able to comprehend G-dliness. Through this cloud he also received energy for his physical body similar to a person who sees a very clear and bright light through a sheet.

[1] Torah Or p. 16a