I spend an unhealthy amount of time watching food based videos on youtube when I'm fasting. And weirdly the urge just to watch those videos isn't there on normal eating days.
Also, I've been doing a bit of reading up on fasting - I've been doing 5:2 for 4 months, 5.5 kg down - and fuck me, the intermittent fasting community is bonkers. People getting shot down for "ruining their fast" by having a 20kcal herbal drink, or others recommending 48hr fasts 2x a week. I haven't seen this level of diet cult since I was into keto!
On a positive note, I took some progress pictures today to see how I've been faring, amazed at the difference that 5.5kgs makes. Especially as I've stalled out on weight loss. Would recommend keeping some photos to anyone trying to stay motivated.