In lockdown, things to look forward to are vital. Lunch is one. The delivery of whatever useless tat you've been suckered into buying online is another.
I am trying the 5:2 diet, because I heard it facilitated George Osborne's transformation from awful bastard into slightly thinner awful bastard. This requires planning, especially where lunch is concerned, because it turns out that on your low-calorie days getting the turkey club sandwich from Sainsbury's will mean all you're allowed to eat for the rest of the day is dust and grass.