Some food in the database come in different measurement units than others. Sometimes the entry is not validated (the little blue checkmark is not there), but at least for the food that has been validated in the DB, it would be very useful to get an automatic unit conversion combined with more mass and volume options in the dropdown menu. Usually a base portion is associated with a corresponding GRAMS and TBSP or CUPS measurement so this seems to me pretty simple to implement with the rule of three.