Mmm - not sure I quite agree. Normal granulated sugar is a carb it is very refined and has no nutritional value - so have as little of that as possible. Other carbs are better but they can make it difficult to lose weight dependent on your metabolism and amount of exercise. The best carbs are complex carbs which you will find in wholegrain. Some fat is definitely bad for you. Avoid fats which have had to be very processed, so soya oil and spreads, even low fat can have trans fats which are bad for you. Olive oil seems to be good for you as does avocado oil, but actually these fats too are best taken without being processed, that is by eating olives and avocados. The same is true of fruit sugars - eat the fruit rather than the sugar which has been processed from the fruit. People say to you calories in should equal calories out and you will be fine. It is not as simple as that. For most people, eat as much unprocessed food as you can, eat as little processed stuff as possible, stop eating when you are nearing full, exercise a little on a daily basis and you will be fine.