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For those that do not want to open the sources spreadsheet, Short answer, the do not compensate for food waste. Interestingly, they also do not account for the food your pets eat.

"The food consumption refers to the amount of food available for human consumption as estimated by the FAO Food Balance Sheets. However the actual food consumption may be lower than the quantity shown as food availability depending on the magnitude of wastage and losses of food in the household, e.g. during storage, in preparation and cooking, as plate-waste or quantities fed to domestic animals and pets, thrown or given away."