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The extent of improvement (%) in perceived stress ((a) PSQ30) and neurovegetative symptoms ((b) PNF) after the eight- and 12-week dietary intervention compared with baseline. Error bars ± 1 SE; •: U = 268.5, p = 0.012 (Mann-Whitney U test); */**, p < 0.05/p < 0.001 (Wilcoxon test).
