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* <code>{nutrient-id}_(100g|serving)</code>: is set to <code>{nutrient-id}</code> (e.g. if <code>nutrition_data_per = 100g</code>, the value of <code>sugars_100g</code> is set to the value of sugars.
 
* <code>{nutrient-id}_(100g|serving)</code>: is set to <code>{nutrient-id}</code> (e.g. if <code>nutrition_data_per = 100g</code>, the value of <code>sugars_100g</code> is set to the value of sugars.
 
* If the serving size is known, we compute the value for the other field (nutrient-id_100g or nutrient-id_serving) in default unit.
 
* If the serving size is known, we compute the value for the other field (nutrient-id_100g or nutrient-id_serving) in default unit.
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* The value of <code>energy_(100g|serving)</code> is calculated from <code>energy-kJ_(100g|serving)</code> if available, otherwise it is calculated from <code>energy-kcal}_(100g|serving)</code>. This field is in <code>kJ</code>. Note however that the kJ and kcal can be different according to the regulation, so do not assume a factor of 4.2 between the values.
    
=== Data display ===
 
=== Data display ===
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e.g. saturated-fat_prepared_100g, saturated-fat_prepared_value etc.
 
e.g. saturated-fat_prepared_100g, saturated-fat_prepared_value etc.
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== Documentation ==
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* [https://blog.trustwell.com/calorie-calculation-country How calories are calculated in different countries].
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* [https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32011R1169&from=FR%20Appendix%20XIV#d1e32-62-1 Energy calculation in the EU]
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