I doubt it's because of the intermittent fasting, if that was the case why isn't she eating lunch and dinner either with the kids? Every meal they have it's the kids eating alone to get it over with and half an hour or hour later Anna and Jonathan eat. Of course there's the odd dinner they have as a family, usually when they get takeout or maybe on a weekend.
And the saddest part is: there's absolutely no reason for this for a couple of stay at home parents, even more now during lockdown, it's not like they work night shifts or work all day and come home after the kids meal times. It's solely because Anna sees her kids as 'work', never 'play'. Everything she does is to keep them alive and the minimal requirement to keep SS away, but there's not joy, no making memories, no sharing emotions and deep love.
I'm not joking when I say most kids in orphanages get more love, hugs and emotional availability from their carers than they kids get from Anna.
How is she still getting Ocado delivery slots?!
Especially as these should be reserved for people over 65 who shouldn't leave the house to go to the shops. Here we have two healthy adults who could easily afford a mask and gloves and go to the shops once a week to get their shopping done themselves. But they're way too entitled to waive that luxury, they rather see those delivery drivers collapsing and an elderly person risk their life.