i know that if i don't have my shake for a longer time than usual that my mouth stinks more than ever and i feel thirstier.
i also have days where i feel hungry as in proper rumbly tums but not all the time. i've started having some savoury flavouring to counter act it. my first thing i do is drink another pint of water to fill me up and if i'm still hungry i have my savoury flavour stuff.
i do recon that you can get days where you're more into ketosis than others so less hungry.