Option to fill in the gaps in nutritional data of some food with some other food
So let's say you want to add your local spinach to your diary. You scan the label, it adds the food with its nutritional values that are on the food packaging.
But: the nutritional values on the food packaging are not complete. In fact, adding generic "spinach" from e.g. the NCCDB database would actually be much more detailed in the vitamins and minerals section. However, the NCCDB spinach may differ in some nutritional values from what is on the label of your local spinach.
So what would be nice in this case is, if you could (as an option) use the nutritional data supplied by the packaging of your local spinach, and fill in the gaps using generic spinach from the NCCDB.