My appetite has been less than usual for a few weeks but yesterday I only ate breakfast, then couldn't manage anything else except water all day. This morning I wasn't hungry when I woke up despite not eating for 24 hours. I did force down half a piece of toast. I'm not expending many calories at the moment as I'm sleeping, resting in bed/ on sofa or gently shuffling around at home but it feels odd not to want any food at all. Is this normal?