Well, I mostly just gave up breakfast and then lunch.
Aside from occasional weekends and certain family functions like weddings where it's rather expected, I haven't really had either for about 7 years or so... Last time I actually had a breakfast was 2012 - Full Scottish breakfast, in Scotland, because it was our honeymoon and because I love stuff like haggis, lorne sausage and tatty scones... and 'cause I'm technically Scottish.
But yeah, having quit smoking a few years back, I've just gotten fatter, really. You'd think one meal a day and having three dogs would help keep the chub off, but apparently not...