The nutritional quality of a diet depends on the overall pattern, not whether every food is fresh, processed or packaged. Some processing improves safety and convenience; highly refined foods can be less nutrient-dense when they displace a varied diet.
SPRU can be used as one whole-food addition to meals and drinks. It cannot correct every nutrient deficiency on its own.
Persistent fatigue, unexplained weight change or suspected deficiency should be assessed by a qualified healthcare professional.