They only really have hay, Fibafirst sticks, dried herbs, a tiny (and I mean tiny) pinch of muesli for breakfast, and weighed pellets for tea (10g each but I think Coco has more than her fair share!). Hay obviously is accessible 24/7, Fibafirst they have 6 between them a day. And that's it. They have access to grass twice a day, every day of the year without fail (unless it's absolutely horrendous weather). Oh, and the odd flower. Fresh mint. Bramble when in season (re-introduced slowly). No veg, no fruit. Nothing else. They've been on the same brand of pellets since the day we brought them home at 6 weeks old so I can't see she's suddenly developed an intolerance to those.
The vet knows what food they have (I've even taken in a sample of each) and is very happy with it, even the muesli because as I said to the vet, I love roast beef & Yorkshire pud but I wouldn't want it every day (as in just hay & grass) so a little bit of something else helps break up the monotony. She's quite happy with the amounts we give too of the extra stuff, like the muesli. And again, they've had the muesli for years too, probably as long as 4 years and it's the same brand, same supplier.
So there's nothing to alter. We took the veg & fruit out because she was bad after that. I gave them strawberry hulls one night - the following morning I found her ill so that was that for them! But they'd had them in the past though, admittedly not regularly, but they didn't have many i.e. slow re-introduction, but they still made her ill.
A good idea, Omi, but there's nothing to change.