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Fructose and Liver

Added sugars are high in “Fructose,” which can overload our liver.


In order to fully comprehend what is so alarming about fructose (i.e. high fructose corn syrup); we need to understand what it is and what happens to it when we ingest it.

KETO HFCS sweetened fruit-drinks-and-teasFructose is a component of the two most popular sugars. One is table sugarsucrose. The other is high-fructose corn syrup.

Before any sugar we consume enters our bloodstream from the digestive tract (small intestines), it is broken down into simple sugar, glucose.

Reason: Our body can metabolize sugar as energy source only in its simplest form; so it breaks down the complex sugars into glucose. 

Glucose is found in every living cell on the planet. If we don’t get glucose from our diet, our liver produces it.

Fructose is entirely different (same as lactose from cow’s milk) than all other types of sugar. Our body doesn’t produce fructose, as we have no physiological need for it.


Fructose can only be metabolized by our liver.


Not all food calories have the same impact on fat storage and energy expenditure, regardless of whether they come from fat, protein or carbohydrate. Fructose, a type of carbohydrate, is not metabolized like other foodstuffs, and not even like glucose, the other major carbohydrate.

When ingested, fructose moves through our digestive tract (mouth, stomach and small intestines) for the most part unchanged. It simply tumbles in its original form in the stomach, while other foods are being processed. Consequently, it merely crowds our digestive tract unchanged until it is taken up by the liver from small intestines. Therefore, if you must, it is advisable to …

… consume fructose containing fruits on an empty stomach about 30 minutes before eating anything else.

It is not a major problem if a healthy person eats restricted amount of fruits (fructose), as the fructose will be turned into glycogen and stored in the liver until extra energy is needed.


Overloading the liver with fructose can cause “Non-Alcoholic Fatty Liver Disease” (NAFLD)

When our liver is full of stored glycogen (quite commonly so), eating a lot of fructose overloads our liver and forces it to turn the fructose into fat. When fructose gets turned into fat in the liver, it is shipped out as VLDL cholesterol particles.

However, not all of the fat gets out, some of it lodges in the liver. This can lead to Non-Alcoholic Fatty Liver Disease (NAFLD), a growing problem in Western countries that is strongly associated with metabolic diseases.

KETO stages of liver

People who are overall healthy and lead a highly active lifestyle can tolerate more fructose than people who are sedentary and eat high-carb, high-calorie Western diet. Studies show that individuals with fatty liver consume up to 2-3 times as much fructose as the average person.


High-Fructose Corn Syrup (HFCS)

Derived from corn starch, syrupy HFCS is the scariest sweet.

HFCS contains mercury, a by-product of chemical processing.

But another danger is its high artificial fructose content, not to mention that it can be 75 times sweeter than white sugar.


Listen up, agave eaters:

The processed nectar can be up to 85 percent fructose and possibly more damaging to our liver than HFCS!


Summing up:

Excess fructose gets turned into fat, which lodges in the liver and can cause non-alcoholic fatty liver disease.

Fructose is a component of the two most popular sugars.

  • One is table sugar —sucrose.
  • The other is high-fructose corn syrup.




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