Deut 8:3, Ps 78:23-29
In the Old Testament, the Israelites ate the food God gave them from heaven and survived in the wilderness. (Ps 78:23-29)
Ps 78:23 Though he had commanded the clouds from above, and opened the doors of heaven, 24 And had rained down manna upon them to eat, and had given them of the corn of heaven. 25 Man did eat angels' food: he sent them meat to the full. 26 He caused an east wind to blow in the heaven: and by his power he brought in the south wind. 27 He rained flesh also upon them as dust, and feathered fowls like as the sand of the sea: 28 And he let it fall in the midst of their camp, round about their habitations. 29 So they did eat, and were well filled: for he gave them their own desire;
And the reason God gave this food is that man must live by all the words of the Bible. (Duet 8:3)
Deut 8:3 And he humbled thee, and suffered thee to hunger, and fed thee with manna, which thou knewest not, neither did thy fathers know; that he might make thee know that man doth not live by bread only, but by every word that proceedeth out of the mouth of the Lord doth man live.
Jesus said that the food that God gave in the Old Testament was to explain the bread of life that God would give us in the future. And he revealed that that food was Himself.(Jn 6:31-35, 47-51)
Jn 6:31 Our fathers did eat manna in the desert; as it is written, He gave them bread from heaven to eat. 32 Then Jesus said unto them, Verily, verily, I say unto you, Moses gave you not that bread from heaven; but my Father giveth you the true bread from heaven. 33 For the bread of God is he which cometh down from heaven, and giveth life unto the world. 34 Then said they unto him, Lord, evermore give us this bread. 35 And Jesus said unto them, I am the bread of life: he that cometh to me shall never hunger; and he that believeth on me shall never thirst. 47 Verily, verily, I say unto you, He that believeth on me hath everlasting life. 48 I am that bread of life. 49 Your fathers did eat manna in the wilderness, and are dead. 50 This is the bread which cometh down from heaven, that a man may eat thereof, and not die. 51 I am the living bread which came down from heaven: if any man eat of this bread, he shall live for ever: and the bread that I will give is my flesh, which I will give for the life of the world.
What is expressed as food is premised on what you should eat every day. We need to know every day that Jesus is the Christ through all the Scriptures.