The caloric density of sugar is high due to its lack of nutrient con-tent. Each teaspoon of sugar contains 20 calories. The problem is that these are 20 empty calories that offer nothing. This means that they’re 20 calories you’re using up of your daily allowance that provides nothing in ways of benefitting your health. As these 20 calories are not satiating, you’re probably also likely to eat another 20 calories to make up for them. This will then be stored as fat.
Sugar is also problematic in that it often goes under the radar as an ingredient. On a label, it appears under carbohydrates (as sugar) sugar is a carbohydrate. Still, it is a simple carbohydrate, which means that it is metabolized quickly and will be stored as fat if not burned immediately. So, if you combine a lack of physical activity with increased sugar consumption, you will store it as fat.