Well, does it? I ask this question whilst sipping on a very delicious white chocolate mocha. As you can guess, it would take some pretty damning evidence to get me to stop drinking my precious coffee, is there any? Lets take a look.
A study done at Western Australia’s School of Medicine and Pharmacology, conducted an experimental study on male rats (yes rats, not humans) in which they were separated into three groups; a group fed a normal diet, a high fat diet, and a high fat diet + CGA. CGA otherwise known as Chlorogenic acid is a polyphenol, ”Polyphenols act as antioxidants. They protect cells and body chemicals against damage caused by free radicals, reactive atoms that contribute to tissue damage in the body.” (MedicineNet.com) The importance of CGA all has to do with its relationship with coffee, it is “a major component.” (Journal of Agriculture and Food Chemistry) The rats fed a high fat diet+CGA showed fat retention not found in the other groups. The CGA + high fat group also “had a tendency for a higher degree of glucose intolerance and increased insulin resistance.”(The Telegraph) The researchers found that after so much CGA the cost far outweighed the benefits, for the “diet-induced obese mice.” (Journal of Agriculture and Food Chemistry)
Fortunately for me, it looks like I wont be stopping my coffee consumption anytime soon. I have laundry list of problems with this research and how it has been interpreted, like the The Telegraphs misleading header “Regular coffee drinkers at increased risk of weight gain.” First things first, the only rats that gained weight were the already “high fat” fed rats. There is certainly a possibility that reverse causation was involved, perhaps the fat in the rats caused the CGA to not do its job. Secondly, the research was done on all male rats, who knows maybe humans who are on high fat diets react differently to CGA, not to mention woman and men may differ in how their bodies use CGA. Finally, the researchers only found CGA to have a negative effect on health fallowing excessive intake of it, over four coffees, I certainly don’t drink that much. A whole lot more research is necessary in order to actually find out if coffee causes obesity, preferably on humans this time. In the mean time, it looks like the average coffee drinker is out of the blue.
Sources:
http://www.medicinenet.com/script/main/art.asp?articlekey=16619