Fructose, Glucose's evil twin brother.
Excerpts from the American Journal of Clinical Nutrition: Fructose, weight gain, and the insulin resistance syndrome,
What does the evil twin of glucose do to the body?
Lowers leptin concentrations:
"Because leptin production is regulated by insulin responses to meals, fructose consumption also reduces circulating leptin concentrations"
Fructose is considered a low glycemic sugar, which means it doesn't trigger insulin response, but don't let that fool you.
Fructose turns directly into fat in the liver, which either collects around your organs as visceral fat or floats around your blood stream as heart clogging cholesterol. Look up the metabolism of fructose, it's almost as frightening as the metabolism of alcohol.
Eating lots of fructose reduces leptin and insulin in your blood, therefore causing you to be resistant to the effects of either hormone, which is supposed to regulate your well-being and health in terms of diet. Fructose comes in and turns into chaos what was once in order:
"The combined effects of lowered circulating leptin and insulin in individuals who consume diets that are high in dietary fructose could therefore increase the likelihood of weight gain and its associated metabolic sequelae."
Fructose impairs glucose tolerance. That means eating so much fructose has also caused your body to become allergic to glucose too:
"Fructose consumption induces insulin resistance, impaired glucose tolerance, hyperinsulinemia, hypertriacylglycerolemia, and hypertension in animal models."
Ref: American Journal of Clinical NutritionPoints to remember:
1. If you have more bodyfat than normal or are considered obese by certain standards, you already have metabolic syndrome in the form of leptin and insulin resistance.
2. The only way to efficiently reverse or minimize the damage of insulin and leptin resistance is to reduce the consumption of fructose and alcohol to nil for a lengthy amount of time, if not permanently. This also includes starchy glucose foods as well, since one evil sugar has already caused your body to hate the good sugar too, you might as well reduce consumption of both.
3. Take a look around and look at all the people who are morbidly obese. They're the ones with the sweet tooth's. Fructose is a useless sugar. It has no function in the human body except for turning directly into fat. 100% of fructose turns into fat. At least with glucose, if you're not insulin resistant, only 10% is turned into fat. If you ARE insulin resistant, thanks to fructose, 100% of glucose also turns into fat. In other words, fructose doubles the rate of fat accumulation by turning glucose evil too.
Here's one of my favorite websites to visit,
Authority Nutrition,
an evidence based approach. Excerpt: "
Glucose is absolutely vital to life and is an integral part of our metabolism....Fructose, however, is very different. This molecule is not a natural part of metabolism and humans do not produce it."
That'll tell you everything you need to know about why humans don't need to eat fructose. Fructose is a sneaky ninja. Fructose alone doesn't make you fat, but if eaten with glucose, the fat will pile on at an accelerated rate until you finally look in the mirror and see a significant change in body composition and wondered what the hell just happened.