The document discusses a study that examined the effects of different sodium diets on rats over 60 days. Researchers divided 36 rats into 3 groups eating low, normal, or high sodium diets. They weighed the rats weekly and found no significant weight differences between groups. Bone analysis found increased bone area and thickness in the low sodium group, indicating higher osteoblast levels and bone formation. Analysis of one bone found no dietary effects. Gene expression analysis also found higher levels of bone growth genes in the low sodium rats.