In a very interesting study by Seiguer et al. [14], the researchers carried out a 2 week randomised
crossover trial to determine whether the intake of MRP effects the antioxidant defence
system in male adolescents (11–14 years, n = 18). Markers of oxidative damage (i.e. serum 2-
thiobarbituric acid-reactive substances and erythrocyte hydroperoxides) and antioxidant
defence parameters (i.e. serum antioxidants, and the enzymatic activities of catalase, superoxide
dismutase, and glutathione peroxidase) were unchanged after the dietary treatments
either rich in or poor in MRP (i.e. the brown diet and white diet, respectively). In-vitro tests of
the brown diet showed a greater antioxidant potential to scavenge free radicals and a greater
capability to reduce lipid peroxidation than those for the white diet