Read the passage from A Room of One’s Own. For surely it is time that the effect of discouragement upon the mind of the artist should be measured, as I have seen a dairy company measure the effect of ordinary milk and Grade A milk upon the body of the rat. They set two rats in cages side by side, and of the two one was furtive, timid and small, and the other was glossy, bold and big. Now what food do we feed women as artists upon? I asked, remembering, I suppose, that dinner of prunes and custard.

What idea is emphasized by the connotations of the underlined words?