It seems someone has implemented this already via nutritionx

Why is this topic still open? Are there gaps with this ? I am a developer and I can help.

Also I like myfitnesspal is a source for food calories and i think their database is quite comprehensive.
posted by <hidden> • 4 years and 1 month ago Link

Also see, They have more data for popular brands (31361 foods at the moment).
posted by jkanarek Staff3 years and 10 months ago Link
This currently works for calories but not other nutritional facts. Further work on other aspects of nutrition would be valuable.
posted by <hidden> • 3 years and 5 months ago Link