Not putting solid food into your system for long periods of time (months, years) will destroy your ability to digest solid food when you start refeeding. I've seen people in eating disorder facilities who have lived on diets of liquid food (historically Ensure, basically the same thing) who have not defecated for months, and when they start eating again suffer for weeks and weeks from horrendous constipation, often requiring further hospitalization. This has happened to me.
Your ability to digest basically shuts down, your intestines stop moving what little solids there are through you.
Not eating solid food is not good for you. Don't do it.