Milk and Meat are used on several occasions in the New Testament as they are in our current time to describe the diet of a baby/child or a more mature/older person. In the scriptural sense it refers to those have not grown in spiritual maturity in their lives since accepting Christ and those who have.
Paul, an apostle, wrote to the Corinthians: “Dear brothers and sisters, when I was with you I couldn’t talk to you as I would to spiritual people. I had to talk as though you belonged to this world or as though you were infants in Christ. I had to feed you with milk, not with solid food, because you weren’t ready for anything stronger. And you still aren’t ready, for you are still controlled by your sinful nature.” (1 Corinthians 3:1-3)
Again he wrote: “For though by this time you ought to be teachers, you have need again for someone to teach you the elementary principles of the oracles of God, and you have come to need milk and not solid food. For everyone who partakes only of milk is not accustomed to the word of righteousness, for he is an infant. But solid food is for the mature, who because of practice have their senses trained to discern good and evil.” (Hebrews 5:11-14)
Once more: “When I was a child, I spoke and thought and reasoned as a child. But when I grew up, I put away childish things.” (1 Corinthians 13:11)
“Jesus used many similar stories and illustrations to teach the people as much as they could understand.”
We are probably into milky food or meaty food by choice, tradition, desire and disposition.
“The seed that fell on the footpath represents those who hear the message about the Kingdom and don’t understand it. Then the evil one comes and snatches away the seed that was planted in their hearts.” Jesus