this is nutritionally a very bad idea. Potatoes are actually pretty nutritious but they are not a complete food. If you're going down the "bland food diet to kill cravings" then follow one of the nutritionally complete diets like soylent green (or any of the numerous competitors)
I can barely stick to an only-Huel diet (one of the competitors you speak of) for even a few days. It does sound like the potato diet may be uniquely interesting for someone who is desperate enough.
