Add Erythritol (and others?) in nutrition facts features

[CharlesNepote]

Some products do display erythritol amount:

• https://world.openfoodfacts.org/product/0850005716358/brown-sugar
• https://world.openfoodfacts.org/product/0008346874637/slim-fast
• https://world.openfoodfacts.org/product/0008346874804/fat-bomb

We can find many more by listing products containing erythritol as one of their ingredients.

It should be added in the following cases/features:

• Displayed in the nutrition facts table, in the carbohydrates section
• complete-as-you-type property in the nutrition facts form
• exclude from energy computation; In the Wikipedia article about Food Energy, we can read: "Some polyols, like erythritol, are not digested and should be excluded from the count". See: Energy-value-in-kcal-does-not-match-value-computed-from-other-nutrients: exclude more products #7789

"Erythritol is a polyol, and according to the current rules as provided for in Article 5(1) of Directive 90/496/EEC, its energy would be calculated using the conversion factor for polyols, namely 10 kJ/g (2,4 kcal/g). Using this energy conversion factor would not fully inform the consumer about the reduced energy value of a product achieved by the use of erythritol in its manufacture. The Scientific Committee on Food in its opinion on erythritol, expressed on 5 March 2003, noted that the energy provided by erythritol was less than 0,9 kJ/g (less than 0,2 kcal/g). Therefore it is appropriate to adopt a suitable energy conversion factor for erythritol." Source: amending Council Directive 90/496/EEC on nutrition labelling for foodstuffs as regards recommended daily allowances, energy conversion factors and definitions.

Erythritol is displayed at least on the nutrition facts table of this product: https://world.openfoodfacts.org/product/0850005716358/brown-sugar
But other nutrients might be added that should be excluded from polyols when computing energy.

More than 1900 products has erythritol as an ingredient, and more than 800 of them are facing at least a data quality error.

[CharlesNepote]

At the end, this product should not return a "en:energy-value-in-kcal-does-not-match-value-computed-from-other-nutrients" error:

• https://world.openfoodfacts.org/product/0850005716358/brown-sugar
  • JSON: https://world.openfoodfacts.org/api/v0/product/0850005716358.json