A recently published study found a correlation between higher rates of coffee drinking in women and decreased risk of depression. Naturally, that finding made headlines. But blogger Scicurious has a really nice analysis of the paper that picked up a significant flaw in the way the data is being interpreted. There was a correlation between drinking more coffee and a lowered risk of depression. But that wasn't the only correlation the researchers found—just the only correlation they made a big deal of in their conclusions.
On her blog, Scicurious lists the other correlations and explains why it's hard to draw any solid conclusion from this data set:
1) Smoking. The interaction between depression risk, smoking, and coffee consumption was “marginally” significant (p=0.06), but they dismiss it as being due to chance because it was “unexpected”. Um. Wait. Nicotine is a STIMULANT. It is known to have antidepressant like effects in animal models (though the withdrawal is no fun). This is not unexpected.
2) Drinking: heavy coffee drinkers drink more. But note that they don’t say that drinking coffee puts you at risk for drinking alcohol.
3) Obesity: heavy coffee drinkers are, on average, thinner, but not more physically active. They do not conclude that coffee drinking prevents obesity.
4) Church going: heavy coffee drinkers are less likely to go to church. Less likely to go to church, less likely to develop depression…heck, forget depression, maybe coffee prevents religion now! Now THAT would be a heck of a finding.
Here’s the thing. I do believe that high coffee consumption correlates with decreased risk of depression. But a lot of other things do as well. I am not convinced that the high coffee consumption wasn’t part of a lifestyle that correlated with decreased risk of depression, maybe they have stronger support networks or less incidence of depression in the family. It could be many other things.
Image: Coffee, a Creative Commons Attribution (2.0) image from dyobmit's photostream
Can you “hear” motion or light flashes? If so, according to new research from City University London, you may be experiencing a not-so-rare form of synaesthesia. Synesthesia is the fascinating neurological phenomenon whereby stimulation of one sense involuntarily triggers another sensory pathway. For example, a synesthete might taste sounds or hear colors. (In this study, […]
Scientists declared the ruby seadragon a new species in 2015, but that was based on dead specimens in a museum. Now though, Scripps Institution of Oceanography biologist Greg Rouse who led the team that originally discovered the species, managed to find two of the wonderful fish swimming around the Recherche Archipelago, off the south coast […]
Scientific American summarized five of Donald Trump’s “major moves many see as hostile toward science.” They are: • Trump’s pick for head of the U.S. Environmental Protection Agency has actively battled its mission “To lead the EPA, Trump appointed Scott Pruitt, the Oklahoma attorney general who has long opposed environmental regulations and has questioned the science […]
Using my iPhone while it’s charging is always a hassle. With tucked-away outlets and the meager length of included lightning cables, comfortable scrolling while plugged in is annoying. These 10-Ft MFi-Certified Lightning Cables are super convenient and probably the best iPhone accessory purchase I’ve made.At over three times the length of normal cables, these reach anywhere you […]
With countless applications for modern life, artificial intelligence (AI) is one of the most in-demand fields of study in tech. Beyond modelling human decision making processes and learning abilities, AI can be used to analyze massive volumes of data and create complex interactive systems.This Machine Learning & AI for Business Bundle made mastering these concepts possible for […]
Computer hacking isn’t just something happening to the DNC. Major software companies need white-hat hackers to ensure the security of their products and users, and I came across a Computer Hacker Professional Certification Package that conveniently teaches those advanced IT techniques online.This course package will prepare you for various computer security certification exams with over 60 hours […]