(1) Healthfulness of food is a continuum, not a boolean. (2) "Ready made" meals covers almost the full spectrum. (3) Achilles heel of the best (really, all) frozen meals (say, Gardenburger with side of broccoli, or vegetable-centric Amy's) is high sodium. (4) If you cook healthfully (say a reasonably faithful version of the Indian or Italian traditions), your meals will have a much better balance of nutrients and especially more micronutrients than the median frozen prepared meal. (5) Plain frozen vegetables (as opposed to frozen prepared dishes/"meals") are excellent food. (6) See Michael Pollan for more.