On 2015 Apr 25, Martin Turner commented:

This should be an interesting study, but I suspect the results may be ambiguous. I think you may be giving your diet group too much sodium. 3 g of sodium is 130 mmol which is close to average sodium intake. Extracellular fluid expands when sodium intake exceeds approximately 800 mg or 35 mmol/day (Freis. Circulation 53(4):589-595 1976). This study will require a substantial effort and it would be worth reducing the sodium intake of your diet group to approximately 800 mg or 35 mmol/day.

On 2015 Apr 25, Martin Turner commented:

This should be an interesting study, but I suspect the results may be ambiguous. I think you may be giving your diet group too much sodium. 3 g of sodium is 130 mmol which is close to average sodium intake. Extracellular fluid expands when sodium intake exceeds approximately 800 mg or 35 mmol/day (Freis. Circulation 53(4):589-595 1976). This study will require a substantial effort and it would be worth reducing the sodium intake of your diet group to approximately 800 mg or 35 mmol/day.