A sticky question – explained

As ‘A Sticky Question’ was my first blog post as a science blogger.  I emailed the post to family and friends and asked for their honest assessments.  I think the biggest thing people were looking for (especially from my non science-y contacts) was a more concise summary of my findings.  While as a chemist I found it really informative to learn about the structures and makeup of different sugars and sweeteners, those without science backgrounds seemed to get a little bogged down in the background information.

To evaluate the different claims about the relative dangers of high fructose corn syrup vs table sugar, I went to the HFCS Wikipedia article.  Now, I know very well that Wikipedia is really not the best source for scientific information.  The Wikipedia section on the health effects of HFCS is ‘under dispute’ so rather than reading the Wikipedia article, I went to the original scientific research articles the Wikipedia article cited.  It is the various interpretations of these Wikipedia articles that has led to such a vigorous debate about HFCS.  There were four main articles that seemed to be at the center of the debate, so I analyzed those articles myself.

Article 1: ‘Consumption of HFCS in beverages may play a role in the epidemic of obesity.’
As I read this article, the authors mainly noted that we are getting fatter, and we are eating more HFCS, so there could be a relationship.  Notice the ‘may’ in their article title.  IMHO, the authors of this article didn’t address the important question if HFCS is causing us to get fatter – it could be just that we’re eating more calories and that’s why we’re getting fatter.

Article 2: ‘Consuming Fructose-sweetened Beverages Increases Body Adiposity in Mice’.  They stated in their results and discussion that:

I was frustrated by this article because they were comparing mice consuming 100% fructose to mice consuming sucrose (table sugar) and noted that the fructose mice got fatter than the sucrose mice.  However, HFCS is NOT 100% fructose – it’s a varying mixture of fructose and glucose (from 40:60 to 60:40 fructose:glucose, depending on the type of HFCS).  Since they didn’t compare HFCS to table sugar, I think it’s a stretch to use this article to point a finger at HFCS.

Article 3: ‘Twenty-four-hour endocrine and metabolic profiles following consumption of high-fructose corn syrup-, sucrose-, fructose-, and glucose-sweetened beverages with meals.’

At first I was excited about this article, because it seemed to do what I was looking for: directly compare HFCS to table sugar.  And they used people rather than mice, so it seemed even better.  In general, the researchers didn’t see much of a difference between those fed HFCS and those fed sugar.  However, it was only a 24 hour study, so any long term effects weren’t examined.

Article 4: ‘Fructose-induced leptin resistance exacerbates weight gain in response to subsequent high-fat feeding’

Again, I had similar issues with this paper as I did previous papers – they didn’t compare mice fed HFCS to mice fed table sugar – they compared mice fed fructose to mice fed corn starch (a glucose polymer).  I didn’t think this contributed to the HFCS vs sugar argument.

So overall I was not compelled to believe that HFCS is better or worse for us than sugar.  I think BOTH are bad in excess and we’re probably eating too much sugar.  However, I don’t believe that anyone proved that HFCS isn’t bad for you – I just think the right research has yet to be done.

Consumption of HFCS in beverages may play a role in the epidemic of obesity: http://www.ncbi.nlm.nih.gov/pubmed/15051594
Consuming Fructose-sweetened Beverages Increases Body Adiposity in Mice: http://www.nature.com/oby/journal/v13/n7/abs/oby2005136a.html
Fructose-induced leptin resistance exacerbates weight gain in response to subsequent high-fat feeding: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2584858/?tool=pmcentrez