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Fructose, which literally means "fruit sugar,"* sounds so sweet and innocent. And indeed, when incorporated into the diet in moderate amounts in the form of fruit – always organic and raw, when possible – it's about as pure and wholesome as as a nutrient can get.
Not so for industrially processed fructose in isolate form, which may be as addictive as alcohol,[i] and perhaps even morphine [ii] [iii]and which according to USDA research published in 2008 into major trends in U.S. food consumption patterns, 1970-2005, we now consume at the rate of at least 50 lbs a year -- the '800 ounce gorilla' in the room.[iv]
Our dietary exposure to fructose, of course, is primarily through either sugar (sucrose), which is a disaccharide comprised of 50% fructose and 50% glucose by weight, or through high-fructose corn syrup (HFCS), which is mostly a 55% fructose and 45% glucose blend of monosaccharides, but goes as high as 90% fructose and 10% glucose in HFCS-90 form. Pasteurized fruit juices are another concentrated source of fructose, but increasingly even pasteurized fruit juice is being adulterated with additional sugar or HFCS for reasons that have mostly to do with protecting the manufacturer's bottom line.
Because high-fructose corn syrup contains free-form monosaccharides of fructose and glucose, it cannot be considered biologically equivalent to sucrose, which has a glycosidic bond that links the fructose and glucose together, and which slows its break down in the body. The attempt by the HFCS industry to re-label their product as "corn sugar," which was recently denied by the FDA,[v] belies their anxiety about the differences, and also reveals growing awareness among the public of isolated fructose's inherently toxic properties.
The reality is that fructose can cause far more damage than glucose, and we must look beyond caloric equivalences to understand this. While in times of need (e.g. starvation, post-workout glycogen depletion), fructose is as effective as glucose in replenishing glycogen stores, in "hypercaloric" states of excess consumption, it can lead to a process known as glycation whereby a sugar binds with protein or lipid molecules, often resulting in damage to cells and tissues.
For example, in vitro studies show that fructose damages proteins seven times more rapidily than glucose through a process known as protein fructosylation, which is when a sugar undergoes a Malliard reaction with a protein, which basically results in the caramelization (browing) of blood and tissue contents, "gumming up the works." For example, if you try baking a pastry made with fructose, instead of white sugar, it will brown much more rapidly as a result of this Malliard reactivity.
Fructose actually shares great resemblance to alcohol (ethanol), such as being capable of stimulating dopamine production in our brain, as well as sharing similar metabolic pathways and effects on the liver (e.g. fatty liver). Their great similarities make even more sense when you consider that fructose can easily be converted into ethanol with a pinch of yeast in order to make alcoholic beverages.
So toxic is "purified" fructose that here at GreenMedInfo we have indexed research on over 70 adverse health effects associated with its excessive consumption, which include:
- Insulin Resistance (32 studies)
- Fatty Liver (22 studies)
- Obesity (13 studies)
- Metabolic Syndrome (19 studies)
- Hypertension (10 studies)
- Elevated Uric Acid (9 studies)
- Elevated Triglycerides (14 studies)
- Belly Fat (2 studies)
- Cardiovascular Diseases (4 studies)
- Liver Stress (6 studies)
- Pancreatic Cancer (2 studies)
- Leptin Resistance (2 studies)
To view the first hand research on 70+ forms of fructose toxicity click the hyperlink.
Like many foods consumed en masse, which may have a lesser known dark side (e.g. wheat), our global fixation on fructose may reveal something about it's hitherto under appreciated addictive properties.
Fructose's Drug-like Hold On Our Bodies
Fructose addiction and alcoholism, in fact, share a number of parallels. In an article titled, "Fructose: metabolic, hedonic, and societal parallels with ethanol," published in the Journal of the American Dietetic Association in 2010, Robert H. Lustig, MD broke new ground by identifying the great similarities between these two substances:
Rates of fructose consumption continue to rise nationwide and have been linked to rising rates of obesity, type 2 diabetes, and metabolic syndrome. Because obesity has been equated with addiction, and because of their evolutionary commonalities, we chose to examine the metabolic, hedonic, and societal similarities between fructose and its fermentation byproduct ethanol. Elucidation of fructose metabolism in liver and fructose action in brain demonstrate three parallelisms with ethanol. First, hepatic fructose metabolism is similar to ethanol, as they both serve as substrates for de novo lipogenesis, and in the process both promote hepatic insulin resistance, dyslipidemia, and hepatic steatosis. Second, fructosylation of proteins with resultant superoxide formation can result in hepatic inflammation similar to acetaldehyde, an intermediary metabolite of ethanol. Lastly, by stimulating the "hedonic pathway" of the brain both directly and indirectly, fructose creates habituation, and possibly dependence; also paralleling ethanol. Thus, fructose induces alterations in both hepatic metabolism and central nervous system energy signaling, leading to a "vicious cycle" of excessive consumption and disease consistent with metabolic syndrome. On a societal level, the treatment of fructose as a commodity exhibits market similarities to ethanol. Analogous to ethanol, societal efforts to reduce fructose consumption will likely be necessary to combat the obesity epidemic.