In depth with fructose

[Mash1]

I did a search and didn't come up with anything. What are you guys opinions on fructose? I take in ALOT of fruits and veggies so therefore of course I'm taking in ALOT of fructose, especially with apples, bananas etc. Apples contain roughly 5-6 grams of fructose per 100g serving! I've been taught in school that when the liver processes the fructose, if your liver glycogen levels are full, then the fructose is turned into fat. Also, this fat isn't stored in the liver, but shipped to other parts such as your abdomen, lower back etc.

Am I overreacting/not completely understanding something or would this be true?

Also, Phil, I'd like to hear your input on this as well.

 

[Quad-smack]

If you are doing adequate cardio on a daily basis, I think it would be difficult to have your liver glycogen stores topped up all the time...
What you are talking about is a food that is 5-6% fructose by weight - not a problem. Regular corn syrup is 45% fructose and HFCS is 55% fructose - now that would be a problem.

 

[Mash1]

I'm doing roughly 15 mins of pretty intense cardio every morning on an empty stomach almost everyday.

I thought they were pretty much full all day except for when you first wake up before your first meal? I thought they got topped off ASAP.

 

[felix83]

There are different types of fructose. Fructose from corn and fructose from fruit. The diff in quality between these two is like the diff between a lump of coal and a diamond. In my view, dont worry about putting on fat from fruit.

 

[Quad-smack]

I'm doing roughly 15 mins of pretty intense cardio every morning on an empty stomach almost everyday.

I thought they were pretty much full all day except for when you first wake up before your first meal? I thought they got topped off ASAP.

What % of your diet is Carbohydrate?

 

[Mash1]

Ok, I understand it's relatively not that much fructose compared to the other nutrients...it's just that I'm taking in like over 100g of fructose somedays. That just seems like it would be getting stored as fat.

 

[Boo]

You should replay back episodes of No Bul radio. Dr.Scott Connelly has some very bad things to say about it.

Boo

 

[Conan21]

I don't believe it acts any different than any other carb in terms of storing bodyfat.

I have used alot of fruit before and it didn't happen to me. I've aslo seen people diet for shows use alot of fruit.

If people are dieting for bodybuilding shows reaching 5% bf i would say that it is not the case.

Too many calories = getting Fatter

 

[Mash1]

I don't believe it acts any different than any other carb in terms of storing bodyfat.

I have used alot of fruit before and it didn't happen to me. I've aslo seen people diet for shows use alot of fruit.

If people are dieting for bodybuilding shows reaching 5% bf i would say that it is not the case.

Too many calories = getting Fatter

It might not be any different. I'm just asking because it seems to just be science that its going to get stored as bodyfat..

 

[StoryOfTheYear]

I eat A LOT of fruit everyday and my BF% is slowly decreasing. -StOrY

 

[Mash1]

I eat A LOT of fruit everyday and my BF% is slowly decreasing. -StOrY

That might be true, this isn't answering my question whatsoever though.

I'm not trying to come of as someone testing theories or questioning peoples diets, I just would like to know scientifically speaking if this is true.

 

[Quad-smack]

That might be true, this isn't answering my question whatsoever though.

I'm not trying to come of as someone testing theories or questioning peoples diets, I just would like to know scientifically speaking if this is true.

It is true - but if and only if your liver glycogen levels are to the spill-over point. If you do daily cardio & lifting - I don't think that will be the case.

 

[Ness]

Fruit isnt just about the fructose/carbs just like EFAs are not just about the fat. There are many other factors why fruit is a superior source of carbs for BBing. Their enzymes and nutritional values for one.

 

[Mash1]

So just stay active throughout the day and I should be fine? Sounds good then.

 

[brineal]

i love using fruit for carbs, especially in the am upon waking, the liver is able to immediately use fructose to replenish glycogen afte sleep

 

[Ness]

So just stay active throughout the day and I should be fine? Sounds good then.

Instead, listen to what Phil told you to do. He told you to eat certain foods within certain macros when youre hungry. Its simple. If you follow his routine, you will not over eat or under eat. Instead, you should exchange fat for muscle at a steady rate. Thats how its designed to work and it will if you let it.

 

[buselmo]

I've been taught in school that when the liver processes the fructose, if your liver glycogen levels are full, then the fructose is turned into fat. Also, this fat isn't stored in the liver, but shipped to other parts such as your abdomen, lower back etc.
Am I overreacting/not completely understanding something or would this be true?

They also taught us that masturbating will grow hair on your palms and your eyes will melt...
J/K

If you are in a caloric deficit and your glycogen stores are almost empty, trust me, even drinking a can of pepsi will fill up your glycogen and none of it will turn into fat.

You can get big ripped and full preparing for a contest with your only carb source being fruits. don't worry, just listen to phil and you'll be alright

 

[dragonfire101]

You need some for thyroid regulation from my understanding, but not in excess of liver glycogen levels being past full and spilling over.

 

[dragonfire101]

Diabetes 51:606-614, 2002
© 2002 by the American Diabetes Association, Inc.
Fructose Improves the Ability of Hyperglycemia Per Se to Regulate Glucose Production in Type 2 Diabetes
Meredith Hawkins, Ilan Gabriely, Robert Wozniak, Cristian Vilcu, Harry Shamoon, and Luciano Rossetti

Division of Endocrinology and Diabetes Research and Training Center, Albert Einstein College of Medicine, Bronx, New York

The ability of hyperglycemia per se to suppress endogenous glucose production (GP) is blunted in type 2 diabetes. This could be due in part to decreased glucose-induced flux through glucokinase (GK). Because fructose activates hepatic GK, we examined whether catalytic amounts of fructose could restore inhibition of GP by hyperglycemia in humans with type 2 diabetes. Glucose fluxes ([3-3H]glucose) were measured during euglycemia (5 mmol/l) and after abrupt onset of hyperglycemia (10 mmol/l; variable dextrose infusion) under fixed hormonal conditions (somatostatin infusion for 6 h with basal insulin/glucagon/growth hormone replacement). A total of 10 subjects with moderately controlled type 2 diabetes and 7 age- and BMI-matched nondiabetic subjects were studied on up to three separate occasions under the following conditions: without fructose (F-) or with infusion of fructose at two dosages: 0.6 mg/kg · min (low F) and 1.8 mg/kg · min (high F). Although GP failed to decrease in response to hyperglycemia in type 2 diabetes, the coinfusion of both doses of fructose was associated with comparable decreases in GP in response to hyperglycemia (low F = -27%, high F = -33%; P < 0.01 vs. F- at both dosages), which approached the 44% decline in GP observed without fructose in the nondiabetic subjects. GP responses to hyperglycemia were not altered by the addition of fructose in the nondiabetic group (low F = -47%, high F = -42%; P > 0.05 vs. F-). Thus, the administration of small amounts of fructose to type 2 diabetic subjects partially corrected the regulation of GP by hyperglycemia per se, yet did not affect this regulation in the nondiabetic subjects. This suggests that the liver’s inability to respond to hyperglycemia in type 2 diabetes, likely caused by impaired GK activity, contributes substantially to the increased GP in these individuals.

 

[dragonfire101]

Diabetes Care 24:1882-1887, 2001
© 2001 by the American Diabetes Association, Inc.
Clinical Care/Education/Nutrition
Original Article
Acute Fructose Administration Improves Oral Glucose Tolerance in Adults With Type 2 Diabetes
Mary Courtney Moore, PHD1, Stephen N. Davis, MD1,2,3, Stephnie L. Mann, BSN2 and Alan D. Cherrington, PHD1,2,3

1 Molecular Physiology and Biophysics and
2 Medicine and the
3 Diabetes Research and Training Center, Vanderbilt University, Nashville, Tennessee

OBJECTIVE—In normal adults, a small (catalytic) dose of fructose administered with glucose decreases the glycemic response to a glucose load, especially in those with the poorest glucose tolerance. We hypothesized that an acute catalytic dose of fructose would also improve glucose tolerance in individuals with type 2 diabetes.

RESEARCH DESIGN AND METHODS—Five adults with type 2 diabetes underwent an oral glucose tolerance test (OGTT) on two separate occasions, at least 1 week apart. Each OGTT consisted of 75 g glucose with or without the addition of 7.5 g fructose (OGTT + F or OGTT – F), in random order. Arterialized blood samples were collected from a heated dorsal hand vein twice before ingestion of the carbohydrate and every 15 min for 3 h afterward.

RESULTS—The area under the curve (AUC) of the plasma glucose response was reduced by fructose administration in all subjects; the mean AUC during the OGTT + F was 14% less than that during the OGTT – F (P < 0.05). The insulin AUC was decreased 21% with fructose administration (P = 0.2). Plasma glucagon concentrations declined similarly during OGTT – F and OGTT + F. The incremental AUC of the blood lactate response during the OGTT – F was ~50% of that observed during the OGTT + F (P < 0.05). Neither nonesterified fatty acid nor triglyceride concentrations differed between the two OGTTs.

CONCLUSIONS—Low-dose fructose improves the glycemic response to an oral glucose load in adults with type 2 diabetes, and this effect is not a result of stimulation of insulin secretion.