Or at least for me?! I find that when I eat lots of carbs I feel all the things that other people claim to feel when they give them up. I have much more energy, can maintain my weight and don't get hungry. When I cut them out I feel exhausted, tired and very grumpy. I exercise an awful lot, running or doing an interval workout daily plus walking 4 or 5 miles a day pushing a buggy, so that's possibly why I need lots of carbs, and I'm a slim size 10. The vast majority of my carbs are from complex carbs, ie whole grains, oats, brown rice, fruit, veg etc. I feel great on a relatively low fat, low protein diet, although I always eat full fat yoghurt etc rather than low fat options; basically try to opt for least processed food options without additives where possible but do eat too much chocolate. Rarely eat any other junk food. I find the anti carbohydrate trend a bit faddish and I just don't think it works well to cut carbs if you're very active.