If the cable isn't in excellent physical shape, its data carrying capability goes down and your Internet speed will suffer. The same rule applies to its connectors and to the cable in Comcast's system as well.
Sugar is a source of carbohydrate and energy. It provides 4 calories per gram or 16 calories in a level teaspoon (4 g). This compares to 36 calories for the same amount (4 g) of fat or oil (e.g., butter, margarine, canola oil). On its own, sugar has no other nutrients.
I know that 1 gram of fat represents 9 kcal of energy, but according to the food energy article, the efficiency of getting that energy isn't 100%, so the formula might be a lot more difficult. I'm not sure what is the real efficiency value here. The article mentions more values, ranging from 18% to 40%.