Carbs are really bad . Is it . In the days of yore when socio , religious , economic racial , demands were different , when humans depended on animals and forest produce for food , when physical work was the only work , the carbs food was not sufficient . The pangs of hunger used to demand more and more food ,and the more the consumption , the more was the need for insulin .But to day there is great change in the work , in the dietary need and the pressures of . Now there is no need of hunting , going round the forests in search of food ,,not enormous physical labour in general . There is drastic cut in the food requirements quantity wise .Now if calorie limited nutricious food is taken over all health is assured . Thus they restrain carb intake . At the same time there is no need to go for excess fats .