No it is not. The only carbs you need to restrict are the processed ones. I've lost about 11kg in a year (while at the same time gaining maybe 2..3kg of muscle) just by switching to high quality food. No more alcohol, no sweets, no cakes, no processed foods (this includes all macronutrients). You could say that I was limiting my carbs but that was just the side effect from switching to high quality sources. Even the lowest carb days I was getting well over 100g of carbs. Carbs are best fuel for your workouts. Together with decent amount of fat they keep your hormone systems running.