GSR and hydrops fetalis: We found that the influence of the diet on the erythrocytes glutathione reductase (GR) activity in DJOS (duodenal-jejunal omega switch) and SHAM-operated (control) rats was significantly higher in groups with the change in diet after the surgery (CD/HF and HF/CD, where CD stands for control diet) than in the rats fed with the same diet before and after surgical procedure (CD/CD and HF/HF).