'Flesh' in the Bible

I made a search with my heart to give pleasure to my flesh with wine, still guiding my heart with wisdom, and to go after foolish things, so that I might see what was good for the sons of men to do under the heavens all the days of their life.

The foolish man, folding his hands, takes the flesh of his body for food.

Let not your mouth make your flesh do evil. And say not before the angel, It was an error. So that God may not be angry with your words and put an end to the work of your hands.

So put away trouble from your heart, and sorrow from your flesh; because the early years and the best years are to no purpose.

And further, my son, take note of this: of the making of books there is no end, and much learning is a weariness to the flesh.