Ecclesiastes 6:7

All of a man's toil [is] for his mouth-- yet his appetite is never satisfied.

Proverbs 16:26

The life of a worker works for him, for his {hunger} urges him.

Genesis 3:17-19

And to Adam he said, "Because you listened to the voice of your wife and you ate from the tree {from which I forbade you to eat}, the ground [shall be] cursed on your account. In pain you shall eat [from] it all the days of your life.

Ecclesiastes 5:10

Whoever loves money is not satisfied [with] money, and whoever loves wealth [is] not [satisfied with] profit. This also [is] vanity!

Ecclesiastes 6:3

Even if a man fathers a hundred [children] and lives many years so that the days of his years are many, if his heart is not satisfied with {his prosperity} and {he does not receive a proper burial}, I deem the stillborn better than him.

Matthew 6:25

"For this [reason] I say to you, do not be anxious for your life, what you will eat, and not for your body, what you will wear. Is your life not more than food and your body [more than] clothing?

Luke 12:19

And I will say to my soul, "Soul, you have many possessions stored up for many years. Relax, eat, drink, celebrate!" '

John 6:27

Do not work for the food that perishes, but the food that remains to eternal life, which the Son of Man will give to you. For God the Father has set his seal on this one."

1 Timothy 6:6-8

But godliness with contentment is a great means of gain.

Treasury of Scripture Knowledge

Summary

All the labour of man is for his mouth, and yet the appetite is not filled.

Bible References

The labour

Genesis 3:17
And to Adam he said, "Because you listened to the voice of your wife and you ate from the tree {from which I forbade you to eat}, the ground [shall be] cursed on your account. In pain you shall eat [from] it all the days of your life.
Proverbs 16:26
The life of a worker works for him, for his {hunger} urges him.
Matthew 6:25
"For this [reason] I say to you, do not be anxious for your life, what you will eat, and not for your body, what you will wear. Is your life not more than food and your body [more than] clothing?
John 6:27
Do not work for the food that perishes, but the food that remains to eternal life, which the Son of Man will give to you. For God the Father has set his seal on this one."
1 Timothy 6:6
But godliness with contentment is a great means of gain.

Appetite

Ecclesiastes 6:3
Even if a man fathers a hundred [children] and lives many years so that the days of his years are many, if his heart is not satisfied with {his prosperity} and {he does not receive a proper burial}, I deem the stillborn better than him.
Ecclesiastes 5:10
Whoever loves money is not satisfied [with] money, and whoever loves wealth [is] not [satisfied with] profit. This also [is] vanity!
Luke 12:19
And I will say to my soul, "Soul, you have many possessions stored up for many years. Relax, eat, drink, celebrate!" '