Why are McDonald's fries not vegan?

Online Answer
For decades, McDonald's fries were cooked in animal fat (lard) which was supposedly what gave them their famous flavor. Eventually, the chain switched to vegetable oil, but customers complained that the fries were no longer as tasty.
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McDonalds small fries (71 g): 230 calories..
Unless a battered fry, they are not adding in salt during the process. I recommend not salting the fries till they come out of the fryer and even then, waiting for an order before salting as the fries can turn limp prematurely if salted too soon..
Ingredients: Potatoes, Vegetable Oil (canola Oil, Corn Oil, Soybean Oil, Hydrogenated Soybean Oil, Natural Beef Flavor [wheat And Milk Derivatives]*), Dextrose, Sodium Acid Pyrophosphate (maintain Color), Salt. *natural Beef Flavor Contains Hydrolyzed Wheat And Hydrolyzed Milk As Starting Ingredients..
Chemicals on the list include dimethylpolysiloxane, sodium acid pyrophosphate, and tertiary butylhydroquinone (TBHQ) — which are all FDA-approved. So to end the clip, Imahara says, "At the end of the day it's not a 'Franken-fry' composed of chemicalsMcDonald's french fries are made from potatoes.
2. Frying fresh-cut potatoes. Soaking peeled, washed and cut fries in cold water overnight removes excess potato starch, which prevents fries from sticking together and helps achieve maximum crispness.