Eaternity has a special way to give ratings for the CO₂ values provided on ingredients, recipes and reports. The biggest benefit is that every portion, no matter how big or small it is, can now be awarded being climate-friendly.
This has important implications, as we can give a climate-friendly award for buffets, side-dishes or even snacks and food products. This means, we can apply what we are doing to many businesses. Also the overall restaurant comparison is fair.
<aside> ℹ️ Previously we normalized by weight or by kcal. This lead to various issues. Normalizing by weight meant, that the best foods were those with a lot of water. Normalizing by kcal led to the fattiest foods having the best score. We agree that both dimension carry meaning, as we need to "fill and fuel" our body. Yet we need to take both into consideration to the respect they fill a requirement for the human body.
We create a unit (DFU) respective to the daily requirement of a person to normalize all food items. This DFU is orthogonal (independent) to our Climate Score, Water Footprint and our Health Score. Which means it cannot have any of their metrics included that indicate healthy foods (like: fiber, high trans fatty acids, low polyunsaturated fatty acids, sodium, etc.). It serves as a proper normalization function.
We include the following nutrients, respective to their recommended daily amounts (as given by the German Health Society (DGE) and other commonly used standards, like the Nutrient Rich Food (NRF) index):
and the sum of all divided by 5
Example 100g whole-grain cereals contains 10g proteins, 7g fats, 1434 KJ, 16g water - 84g dry-weight. Hence the DFU is: (10/50 + 7/66 + (1434 - 17 x 10 - 37 x 7)/6000 + 16/2500 + 84 /600) / 5 = 0.124
Given a CO₂ value of 85g CO₂ / 100g - now we have 685 g CO₂/DFU. This currently scores 82.4% better than the Average food consumption used for comparisons.