The body is pretty versatile, the liver stores about 6 hours worth of glycogen in it, and after that your body starts to break down small amounts of muscle and turn fat into glucose to maintain blood sugar, not only that but most water soluble vitamins have about a day or two worth in your system before you run out of those, and you'll be fine for a bit before you start to run into problems. I don't know where they got their logic but okaaay huffpost you got me 👐