Think all sugars are equal? Think again

Fructose Metabolism Basics

Without getting into the very complex biochemistry of carbohydrate metabolism, it is important to understand how your body processes glucose versus fructose. Dr. Robert Lustig, Professor of Pediatrics in the Division of Endocrinology at the University of California, has been a pioneer in decoding sugar metabolism. His work has highlighted some major differences in how different sugars are broken down and used.

Here's a summary of the main points:

• After eating fructose, 100 percent of the metabolic burden rests on your liver. With glucose, your liver has to break down only 20 percent.
• Every cell in your body, including your brain, utilizes glucose. Therefore, much of it is "burned up" immediately after you consume it. By contrast, fructose is turned into free fatty acids (FFAs), VLDL (the damaging form of cholesterol), and triglycerides, which get stored as fat.
• The fatty acids created during fructose metabolism accumulate as fat droplets in your liver and skeletal muscle tissues, causing insulin resistance and non-alcoholic fatty liver disease (NAFLD). Insulin resistance progresses to metabolic syndrome and type II diabetes.
• Fructose is the most lipophilic carbohydrate. In other words, fructose converts to activated glycerol (g-3-p), which is directly used to turn FFAs into triglycerides. The more g-3-p you have, the more fat you store. Glucose does not do this.
• When you eat 120 calories of glucose, less than one calorie is stored as fat. 120 calories of fructose results in 40 calories being stored as fat. Consuming fructose is essentially consuming fat!
• The metabolism of fructose by your liver creates a long list of waste products and toxins, including a large amount of uric acid, which drives up blood pressure and causes gout.
• Glucose suppresses the hunger hormone ghrelin and stimulates leptin, which suppresses your appetite. Fructose has no effect on ghrelin and interferes with your brain's communication with leptin, resulting in overeating.

So, if anyone tries to tell you "sugar is sugar," they are way behind the times. As you can see, there are major differences in how your body processes each one. The bottom line is: fructose leads to increased belly fat, insulin resistance and metabolic syndrome -- not to mention the long list of chronic diseases that directly result.

If you, like so many others, have struggled with your weight for years; examined your diet; avoided fat and counted your calories, yet not getting anywhere and wondering what you're doing wrong, please pay very close attention to your fructose intake.

In many cases the primary culprit is an excessive intake of hidden sugar in the form of fructose, whether natural fructose (such as agave syrup or 100 percent fruit juice, for example), or in the form of corn syrup (or high fructose corn syrup), which is a main ingredient in countless beverages and processed, pre-packaged foods.

It's extremely easy to consume high amounts of fructose on a daily basis, especially if most of your foods are processed in any way, or if you drink sodas or any other sweetened beverages such as ice-teas, fruit juices and sports drinks. Even seemingly "health-conscious" beverages like Vitamin Water, Jamba Juice and Odwalla SuperFood contain far more added sugar and/or fructose than many desserts!

So please, understand that it's not dietary fat that's making you fat. It's fructose.