Sugar specifically though. It is a cause of high calories due to it's effect of creating a high and then a crash making you hungry again. It is also addictive in itself.
WHO recommend getting it below 50g, ideally 25g per day. I looked on the side of some of the staple things I consumed (milk, bread etc.) and it is tough with modern processed foods to get that low.
If everyone followed the WHO recommendation then full sugar coke is out of business!