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@blueorbits I did a little searching and it looks like you only get the choice of cups, pints and quarts in the US food database. When I typed in Organic Whole Milk, without a brand, there is a choice near the top marked Common. That gives you a cl (centiliter -- one cl is ten ml) choice. Whole milk is whole milk, regulated by the FDA. As a note, I track my water in metric units, even though I am in the US. I don't get metric options in my food database just because I set my water as metric in the advanced settings. So changing your units won't help.
I also looked at your profile and saw your question about logging food for your daughter. I don't think that the kid's view of the Fitbit app lets you log food for children. Even if it did, it would be an ordeal for you to switch back and forth between the parent view and the kid view of the Fitbit app. I think you should search the App Store for a separate, easy to use food tracking app for your daughter.
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