Of course you can and should eat carbs, just not the highly refined processed type like white bread,biscuits pastries etc. Good sources of carbs and fibre are muslei without added sugar, oatcakes, rye crispbread good quality bread in moderation. Plain rich tea biscuits are ok too. Small helpings of potato or beans are good sources . For protein I go for avocado,eggs,fish. a little dark chocolate. Plenty fruit and veg for fibre makes for a balanced diet.