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Food Items Template
To my knowledge no it is not possible to have below 0 quality which might explain why it was not possible to get 1 & 2 star foods before they changed the quality to star rating relationship.
Also I did manage to come up with a formula a while ago it was (MaxFoodStat * 0.5) + ((HiddenQuility/100) * MaxFoodStat * 0.5)
So if we used Truffle Pie as an example it gives 40 HP
5 star range would be (40 * 0.5) + ((95/100) * 40 * 0.5) = 39~40 HP
4 star range would be (40 * 0.5) + ((75/100) * 40 * 0.5) = 35~39 HP
3 star range would be (40 * 0.5) + ((55/100) * 40 * 0.5) = 31~35 HP
2 star range would be (40 * 0.5) + ((35/100) * 40 * 0.5) = 27~31 HP
1 star range would be (40 * 0.5) + ((0/100) * 40 * 0.5) = 20~27 HP
I never ran extensive tests on this formula and a lot of food data on the wiki uses the old star rating formula so I advice doing some tests yourself to check if it’s accurate.
Hope my research is of some assistance in making a food calculator.