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Study provides ‘compelling’ evidence that HFCS and sucrose do not increase liver fat in ‘real world’ conditions

42 commentsBy Elaine WATSON , 13-Feb-2013

Dr Rippe: Studies linking HFCS to non-alcoholic fatty liver disease and diabetes have often used pure fructose (which is rarely consumed in the human diet), unrealistically large doses, or animal models which may not translate to human metabolism
Dr Rippe: Studies linking HFCS to non-alcoholic fatty liver disease and diabetes have often used pure fructose (which is rarely consumed in the human diet), unrealistically large doses, or animal models which may not translate to human metabolism

A new study provides “compelling” evidence that high fructose corn syrup (HFCS) and table sugar (sucrose) do not increase fat levels in the liver when consumed in ‘real-world conditions’, says it co-author Dr James Rippe.

Critics of HFCS in particular have repeatedly claimed that it increases fat levels in the liver and muscle tissue, increasing the risk of non-alcoholic fatty liver disease and contributing to insulin resistance, a key factor in the development of type 2 diabetes.

The argument also features heavily in the CSPI's new petition urging the FDA to reassess the GRAS status of sugar and HFCS in beverages .

However, the studies supporting this hypothesis have subjected volunteers “to unrealistically high levels of fructose or had subjects consume fructose independent of glucose, which is just not how fructose is consumed in our daily diet”, said Dr Rippe, director of the Rippe Lifestyle Institute and Professor of biomedical sciences at the University of Central Florida.

“Using real world conditions [in which glucose and fructose are typically consumed together in the form of sucrose or HFCS], we find that HFCS and other caloric sweeteners do not appear to increase liver fat or contribute to insulin resistance.”

The first study of its kind to test effects of HFCS and sucrose on liver fat levels in humans using real world conditions

The new study , published online ahead of print in the Journal of Applied Physiology, Nutrition, and Metabolism, also adds to a growing body of evidence showing that HFCS and table sugar are metabolically equivalent, claimed Dr Rippe, who received a grant from the Corn Refiners Association to conduct it.

“The study’s results are compelling because this is the first study of its kind to test the effects of HFCS and sucrose on liver fat levels in humans using real world conditions.”

There is no significant liver fat infiltration or increase in intramuscular adipose tissue

Dr Rippe: 'To the best of our knowledge, this is the first randomized trial to compare fat deposition in the liver and muscle utilizing the two main sources of fructose in the human diet, HFCS and sucrose, delivered at doses within the normal range consumed.'

In the 10-week study, 64 healthy individuals aged 20-60 with a BMI of 23-35 drank low-fat milk sweetened with either HFCS or sucrose, with the added sugar matching the 25th, 50th and 90th percentile population consumption levels of fructose.

They were required to consume one of three different levels of sucrose (which contains 50% glucose and 50% fructose) or HFCS 55 (which contains 55% fructose, 42% glucose and 3% other carbohydrates) at 8%, 18% or 30% of the calories required for weight maintenance. (These consumption levels are equivalent to the 25th, 50th, 90th percentile for fructose consumption respectively.)

The fat content of their livers was measured using unenhanced CT Imaging, while the fat content of their muscle was assessed using magnetic resonance imaging (MRI).

The results showed that “at normal levels of consumption of the most common fructose containing sugars over a 10-week period, there is no significant liver fat infiltration or increase in IMAT [intramuscular adipose tissue]”, said the authors.

“Furthermore, our results demonstrate that there are no differences between HFCS and sucrose related to these two parameters.

“These data suggest that when fructose is consumed as part of a typical diet in normally consumed sweeteners such as sucrose or HFCS, ectopic fat storage in the liver or muscles is not promoted."

Triglyceride levels rose, but remained well within population norms

While there were no changes in total cholesterol, LDL or HDL there was a small increase in triglycerides for the entire cohort (1.11 ± 0.46 vs 1.27 ± 0.73 mmol/L, p<0.05). However, this was comparable among the 6 groups (interaction p>0.05), said the authors.

“While the increases in triglycerides in the current study are not clinically important, this issue remains one of scientific discussion and debate. It should be pointed out that both the pre and post intervention triglyceride levels in the current study are well within population norms.”

Was the study long enough?

However, one possible drawback of the study was that it wasn’t long enough, conceded the authors.

“Our findings must be treated with caution since the duration of the study may not have been long enough to demonstrate accumulation of liver or muscle fat.

“Studies of longer duration utilizing commonly consumed sugars at normal consumption levels are clearly warranted.”

Source: Journal of Applied Physiology, Nutrition, and Metabolism 10.1139/apnm-2012-0322

Title: ‘Consumption of sucrose and high fructose corn syrup does not increase liver fat or ectopic fat deposition in muscles’

Authors: Stephen Bravo, MD; Joshua Lowndes, MA; Stephanie Sinnett, MS RD; Zhiping Fullerton, PhD RD; and James Rippe, MD.

42 comments (Comments are now closed)

Onion Article at Best

CNN.com had this link as a "From around the Web" article. What a piece of junk "science". I am flabbergasted anyone would publish this paper or regurgitate the complete garbage on the web. It's so clear this is bogus -- perhaps it was meant for the Onion. HFCS is not good for you or even benign; it's bad. A 10 week study? Almost laughable. My husband is a biochemist and won't waste the time to comment about this article -- he just rolled his eyes -- but I just couldn't help it.

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Posted by WeAreNotLambs
19 April 2013 | 15h59

10 week trial does not match real world conditions

How can the author of this study complain about "real world conditions" when fructose and sucralose are critiqued, when his own very brief study only lasts 10 weeks? Mr Rippe might want to think a real-world challenge. How about a study that lasts a year as minimum? Americans surely do not drink sweetened drinks for only 10 week durations, habits are developed over years and I think that a 10 week study is pointless if he wants to look at real world results.

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Posted by Victor Lavigne
18 April 2013 | 01h16

10 weeks?

Really? this study is pure nonsense. I'm sure the Corn Refiners Association are happy with their results. Why would you even do such a short study and then end it with "longer tests are warranted." This is junk science, sold to thehighest bidder.

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Posted by Anon
18 April 2013 | 00h15

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