I ate a Pumpkin while Light Green Energized and Dark Green Hydrated and my Hunger and Thirst levels never changed and stopped updating entirely, I decided to eat several more whole pumpkins and nothing changed, never got stuffed or energized or Hydrated.

Logged out and back in and I was Starving and Dying of Dehydration.

I proceeded to eat another Pumpkin so I won't quickly die of Starvation and Dehydration and the first one worked and I became Dark Green Hydrated and Yellow Stuffed, I ate a second one and nothing changed.

I was killed before logging out but I am sure I would have been Starving and Dehydrated again if I had logged out and back in.