My appetite has changed radically of late. I used to like a decent breakfast, lighter lunch, and big evening meal. But now I don't feel like breakfast at all (something I know I'm going to have to overcome when I get back to bike commuting), and don't particularly feel like eating more than, say, a cheese butty in the evening, though I try to cook something because we need to get vegetables into TGL (and keep Butterfly properly fed, too). When I've eaten, I feel overfull and a bit crap, though.
So it's hard for me to regulate my food intake, because I can't rely on my 'standard' options any more. Got to get to grips with it.