Your last sentence in this message is ridiculous. Carbs are a great fuel for the body. Serious weightlifting can be greatly impacted negatively over time by lack of carbs. I definitely don’t recommend you go into a career as a trainer for weight lifters.
There are many reasons sugar is beneficial. It’s always in the blood. The body has to keep it to a certain level. It it’s low, the body converts protein to sugar.
People don’t eat when they sleep. If they don’t have a lot of stored sugar, the body uses vitamins and I think sugar to create hormones that will convert proteins in the muscles to sugar.
The body stores water and potassium with sugar. To have an optimum amount of potassium and water one has to consume sweets until feeling satiated.
Sugar increases magnesium absorption and makes it easy to have a good level.
The body uses sugar to make hormones.