Then they would have gotten the down low on all the food!
Just kidding. Still, here comes the shameless plug for OpenFoodFacts:
OpenFoodFacts is the international, crowd-sourced, open-source food database with ingredients, additives, allergens, nutrition facts (macro and micro nutrients), packaging and every bit of data one can find on the packaging. It has over 4 million products and you can use this data to compute anything you want from nutrition aspects like Nutriscore, ultra-transformation level (Nova), to environmental impact or more. Using the app you can get this data on most products with a barcode. And if none of these scores are to your liking you cant roll out your own algorithm with the criterion you care about. Besides the obvious individual use, OpenFoodFacts is also used by nutrition research institutes to help their cohorts track what they eat and thus help figure out the health impact of each ingredient / additive.
The obvious easy way to contribute is to install the app and add data for all the products you buy, particularly for regional products that not everyone can contribute to. You can also improve the data through the Hunger Games (add ingredients, nutrition facts, hunt nutrition labels). But if you're a developer your help would also be very welcome.
And there's also Pet, Beauty and Products variants if food is not your thing.