I was playing hexxit and my hunger got low (1-2 symbols) so I tried eating a baked potato, this help for a second, but then it instantly dropped me down to 0. I thought maybe it had lagged so I kept trying to eat, but as soon as I got any hunger it went away. I tried switching foods (gelatinous slime, cooked chicken, etc.) but it didn't help. I tried restarting hexxit, but that didn't work either.
I was playing on a server I have with friends, but I was the only one on, I hadn't opened it yet