Frozen Produce (Incl. Store-Bought): Is it okay to consume frozen fruits and vegetables?
Ideally, as-fresh-as-you-can-get-it, organic, fresh fruits and vegetables is recommended for detoxification purposes.
Organic frozen fruit (berries mainly) may comprise a small portion of your diet and overall should bear insignificant or no negative impact.
Fresh to semi-fresh vegetables are usually available all-year-round at the grocery stores and are recommended in place of frozen vegetables.
Organic frozen vegetables, however, are certainly still permissible for the occasional treat meal; be sure they are free of additives and preservatives (which you find more prevalent in frozen vegetables).