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+==Summary==
+"The world produces enough food, but where does it all go?"
+This diagram shows the main inefficiencies of the global food supply.
+It visualizes the relative proportion of:
+* food crops harvested from farms (a.k.a. the production [[Term:primary|primary]])
+* food burned as [[biofuel]]
+* food fed to animals
+* food produced by animals
+* food loss
+* [[food waste]]
+* food actually eaten
+For ''animal feed'', the diagram ''does not'' count grasses, crop residues, or anything else inedible to humans. The diagram strictly shows the usage of ''human-edible'' foodstuffs.
+==Methodology==
+The thickness of each branch in the diagram, is proportional to the human-edible calories of food involved.
+All the per-capita numbers below are calculated as ('''total food''') divided by ('''world population''').
+Food Crops Harvested: '''5454 [[Term:kalories|kalories]]/day/capita'''
+* calculated by [[Code:food1.sql]]
+** SQL code: <code>SELECT SUM(production_kalories_per_day)/7.9e9 FROM main WHERE region_name="World";</code>
+MINUS: Biofuels: '''491 kalories/day/capita'''
+* calculated as 9% of Food Crops Harvested. The '9%' comes from [https://www.nationalgeographic.com/foodfeatures/feeding-9-billion/] and refers to calories.
+MINUS: Animal feed: '''1964 kalories/day/capita'''
+* calculated as 36% of Food Crops Harvested. The '36%' comes from [https://www.nationalgeographic.com/foodfeatures/feeding-9-billion/] and refers to calories.
+PLUS: Animal products: '''518 kalories/day/capita'''
+* calculated from [[Code:food2.sql]]
+** SQL code: <code>SELECT SUM(kalories_per_day_per_capita) FROM summary;</code>
+Now we're at: 3518 kalories/day/capita
+* Call this the "Supply".
+MINUS: Food loss: '''493 kalories/day/capita'''
+* calculated as 14% of Supply. The '14%' comes from [https://www.un.org/en/observances/end-food-waste-day] which doesn't specify protein or calories or mass or volume, we just have to assume.
+MINUS: Food waste: '''598 kalories/day/capita'''
+* calculated as 17% of Supply. The '17%' comes from [https://www.un.org/en/observances/end-food-waste-day] which doesn't specify protein or calories or mass or volume, we just have to assume.
+* More details derived from the same source:
+** Household food waste - 387 kalories/day/capita (calculated as 11% of Supply)
+** Food service waste - 176 kalories/day/capita (calculated as 5% of Supply)
+** Retail waste - 70 kalories/day/capita (calculated as 2% of Supply) (percentages don't add up due to rounding errors; this causes kalories to not add up either)
+Food Actually Eaten - '''2427 kalories/day/capita'''
+* Net result.
+** However, this is a global average. 10% of the world is still undernourished, living on less than 1800 kalories/day.
+Finally, to estimate the food that would be needed to end global hunger, we add 2400 kalories/day {{x|which might be an overestimate, since undernourished people still eat ''some'' calories already}} for every undernourished person. There are currently 829 million people undernourished (10% of global population), according to [https://www.actionagainsthunger.org/world-hunger-facts-statistics]. Divide by the ''world population'', for the sake of comparing in the same ''per-capita'' units used above.<br />'''252 kalories/day/capita'''
+The diagram shape was generated by [[Code:make-flow-diagram1.html]], and the resulting image was edited to add annotations and coloring.
+==Notes==
+This diagram is a world overview. It would be worthwhile to ''also'' make more localized versions of this diagram, such as by country. Note that the diagrams would be more complex because of imports & exports at every stage.
+If the diagram was done for rich countries such as the USA, the 'food waste' and 'animal feed' sections would be proportionally ''a lot'' bigger.
+This diagram doesn't currently include fish. If it did,
+* The top part would have to be renamed from 'crops harvested' to 'production primary', and would include ''wild-caught'' fish.
+* The 'animal feed' would include any human-edible calories fed to ''farmed'' fish.
+* The 'animal products' produced would include the ''farmed'' fish.
+To put things in perspective, seafood contributes about 12g protein/day/capita to the global food supply. [http://olam.wiki/calc/calc2.php?a=%28seafood.production.farmed%20%2B%20seafood.production.wild%29%20%2A%20fish.protein&b=%28grams%2Fday%20per%20capita%29%28world.population%29#]