This line stands out to me though: "Nevertheless, it should be noted that the sodium content of the study diets may have confounded these findings." Ya think?

This line stands out to me though: "Nevertheless, it should be noted that the sodium content of the study diets may have confounded these findings." Ya think? Really? May have? We are going to study diet on blood pressure but not control for sodium. I would have a hard time seeing the mechanism that one meal of oats and chicken breast vs 4 meals of oats and chicken breast with same daily calories is going to have much effect on anything.