Richard Johnson explains how the body makes its own fructose from glucose, especially after eating high-glycemic carbs or starch. Studies in humans and mice show that glucose feeding raises liver fructose levels, and blocking fructose metabolism in mice revealed its metabolic role.
Chapters
The body can make a lot of fructose. It isn't just the fructose we eat, it's the fructose we make. And the main source of fructose, and the only source are carbs. And fructose can only be made from glucose. And under the setting of a high carb diet or high glycemic carbs, starchy foods, and even in diabetes, fructose starts to be made. And this has now been shown in people that fructose is produced when you eat starchy foods. And in fact, when we looked at our animals, we found that the fructose levels went up in the liver and in other sites when we fed them glucose. And when we blocked the fructose metabolism by using mice that have had their fructokinase knocked out, remember, that's the enzyme that metabolizes fructose.