highly significantp<0.001
In terms of the mean thickness of the thyroid follicle epithelium, the highest values were measured in C group (6.44 μm), followed by E3 group (6.28 μm), then E2 group (5.8 μm), and finally E1 group (5.01 μm), both E1 and E2 diets showed highly significant differences (p<0.001 for both), whereas E3 showed no effect (p>0.4).