Luke 4:4 Jesus answered, “It is written: ‘Man does not live on bread alone’ but by every word of God. ”

αρτος "bread" - the nutrient-filled sustenance of the New Testament times.

Guzik states:

The temptation to eat something inappropriate worked well with the first sinless man (Genesis 3:6), so why not try it on the second sinless man? By this, we also see how temptation often works. Satan appeals to a legitimate desire within Jesus (the desire to eat and survive).
Satan suggests that Jesus fulfill this legitimate desire in an illegitimate way.

Often, this is the essence of temptation. But Jesus answered him, saying, "It is written, ‘Man shall not live by bread alone, but by every word of God.’" Jesus countered Satan’s suggestion with Scripture (Deuteronomy 8:3). What Satan said made sense - "Why starve yourself to death?" But what is written makes even more sense. Jesus reminded Satan of Biblical truth, that every word of God is more important than the very bread we eat.