[ig1]

I would assume they mean testing it for factors like taste, etc. which would be immediate rather than doing it for nutritional testing.

[gabemart]

Why would you ask doctors or dietitians for advice about the taste of the preparation?

[weego]

I assume he meant that the input from doctors etc is for nutritional reasons but when they ship out to testers they are taking the nutrition changes at face value and are only concerned about feedback from testers on whether it affected the taste/consistency/gives them gas etc.