I know that people will balk at this...but sugar gives me energy! I get really hyper on a bit of sugar
I have a super clean house though LOL
It gives everyone energy. The amount of energy, how many minerals are used in the giving of it, how long it lasts and how big the "sugar blues" are depend on the kind of sugar a person eats though. A wholegrain pasta or bread will still break down into sugar - but more slowly than eating something made with sucrose or glucose. The whole grains come with minerals and vitamins that help metabolize that sugar as they are slowly converted from complex starches into simple glucose or blood sugar.
Pure white sugar and other processed sugars still need vitamins and minerals for them to impart their energy. If they aren't present in the sugar source (and they aren't in white sugar) - they come from your body's mineral and vitamin stores - leaving you with less.
If a person eats no carbohydrates at all and only meat - the body is still going to start converting the animal protein into sugar to keep up glucose levels in the blood.
So, no balking from my pov - just realize that your sugar source alone doesn't give you energy - it still requires vitamins and minerals for that to happen - and if those aren't contained in the sugar source - they have to come from your body's reserves. So eating a processed sugar is still introducing a thief into your body - one that will rob it of various minerals and vitamins in order for it to be metabolized.