Like a lot of non-Americans, I end up entering most of my foods manually off the labels since there are slight regional differences. One gap I've noticed is in the options for choosing serving sizes for volume. This mostly applies to drinks (a standard bottled drink is usually 591 mL), but also to canned items and other foods that are measured by volume instead of weight. At this time, the only serving options available for volume are cups, tbsp and tsp. Volume in metric countries is usually labeled in mililtres or litres, and the conversion to fluid ounces or cups/tbsp/tsp is especially cumbersome.
Since 'grams' are offered as an option for measurement when manually entering foods, it would make sense to make metric volume measurements available as well. Especially since many of the people who make use of the manual entry option come from metric countries and use it specifically because the standard listings are not in metric.
One other side issue with this: to get around the lack of a mL option, I often enter the number of mL as servings (so a standard bottled drink would be listed as 591 'servings'). This works on the website, but the scroller on the iPhone serving app caps out at 500 servings, which means I'd have to enter the drink twice to reflect the amount. It's not a big deal, but it's a limitation with the app.
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