I am trying to calculate choline content of foods. The USDA has a database of choline in common foods that I downloaded from their website. The total choline amounts for each food are listed as mg/ 100 grams of food. This is okay for me until it lists choline in coffee, milk, beer and wine as mg/ 100 grams. How do I convert fluid ounces to grams for different fluids? Do I simply use 1ml=1g and then multiply by the specific gravity of each beverage? Or do I need to figure out how many grams the beverage would be if it were dehydrated? For example, my daughter's baby formula says that 35 grams of the powder makes 8 fluid ounces. Or as another example, it takes 1 TBS of ground coffee to make 2 cups of brewed coffee. 1TBS=.5 ounces. Does anyone know how USDA expects one to calculate it?

Thanks so much!

 

Sounds about right (if I'm remembering right that Specific Gravity is the ratio of density to the density of water)

 

bump^

 

Thanks for vote of confidence....just heard back from the USDA and they do have a well hidden chart of SG for liquids (foods).

Cheers-

PS the above method is right