I'm an apple and definitely found out over New Year about my carb intolerance, whilst at the in laws. After an overload of chicken curry, rice, poppadoms, naan (and yes, where was my self control I hear you ask? Well, it wasn't a fast day!) and NO veg, I just couldn't face the next day's evening meal of lasagne, garlic bread, chips and NO veg, so I had to go to the shops and buy myself a tin of beans (not baked) and some veggies. I'm sure I horrified them (and they probably thought me quite rude, but they've known me long enough for me to explain the reasons) as I ate a generous portion of veg curry and nothing else.
For me, it's about a balance of things; enough fibre, low/lowish carb, fresh veg, fish and meat. I used to be low fat, but am trying to 'up' my good fat in a day, with oily fish, avocado etc.
It's a way of eating that's very sustainable for me. I rarely want anything sweet, which is a huge bonus!