Quote:
Originally Posted by Mr. Laz
because it's processed and partially broken down already
That means it hits your bloodstream faster and all at once, you body reacts different to that "rush" of sugar. Your body thinks you are exercising so it stores fat etc. Causes weight gain and all sorts of issues that natural sugars don't. Process sugar also has addictive traits because of the rush, you body will crave more after rush burns off. You ever feel hungry even though your stomach is stuffed? That's caused by the sugar craving of processed sugar.
Fruit juice from concentrate is also processed, so it's not good for you either.
avoid 'from concentrate' and other processed sugars
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Your conclusions are generally accurate, but some of the points in here are a little off.
It's not related to processing. Fructose is not processed. Fructose is a naturally-occurring sugar. HFCS is an example of a processed sugar.
Fructose is not already broken down. It's chemical structure is merely different than glucose. Consequently, it is metabolized differently.
Both sugars have the formula C6H12O6. The difference is that fructose is a ketose sugar that exists as part of a five membered ring and glucose is an aldose sugar that exists as part of a six membered ring. This means that the two molecules interact with enzymes differently.
We all have various regulatory systems in our bodies that ensure we function optimally. Glycolysis, like all metabolic processes, has rate limiting steps. So even if we consume a ton of glucose, our body can only process it so quickly. Fructose is metabolized by a slightly different pathway without as many brakes on the system, comparatively.
This is a little reductive, I apologize, but without getting too "inside baseball" this is why.