In some ways I think living alone makes things much easier.
Oh yes in some ways
At least I'm no longer buying in things for dds latest healthy eating fad only for it to go to waste as she doesn't actually like it and either I don't like it or it's not veggie
Numerous "discussions" along the lines of
'If i get it you HAVE to use it because I can't"
' I know!'
'And you've definitely had it before and liked it'
'Yes'
Cut to week later when I'm sorting kitchen ready for next delivery
'You never ate x and it's off/out of date now you said you'd use it!'
Cue long list of excuses
'It wasn't as nice as I remembered/I forgot about it then it was out of date/I had nothing to go with it (there was plenty of items that went with it)' 
She also seemed incapable of buying a SMALL amount of anything so my fridge would be chocka with unused leftover takeaways, milk or yoghurt based drinks (don't even get me started
), partially eaten fruit etc
She was also a bugger for taking things I'd earmarked - and told her! - for a specific meal or occasion inc MY dark choc/cream cakes etc that she doesn't even like!
Thanks to the frugal foodies I'm slightly more confident in using things past the date/recommendation but I'm still cautious with some things as I have a ridiculously sensitive stomach and I've learnt over the years to not take the chance most of the time.