To be conscious of size in a dream highlights how we feel in relation to a person, project or object. Big or tall might suggest important or threatening, whereas small might indicate vulnerability or something ‘less than’ ourselves.
Thus a big house would be an awareness of the expansion of oneself, whereas a small house would indicate an intensity of feeling.
The contrast between fat and thin, or thick and thin, is a subjective evaluation that will often depend on cultural differences.
The issue of size in dreams is dependent on our own personal evaluation.
To be actively reducing an article may mean that we are trying to make a project or task manageable.