January 13, 2014 was a red-letter day for coffee drinkers!
Two major health-related stories were widely reported, starting with news (published in Nature Neuroscience) that caffeine enhances “memory consolidation.” Although there have been lots of studies showing that coffee is a cognitive enhancer, there has never been a study in which study participants were asked to memorize something without the benefit of coffee, take caffeine after the memorization activity--- and then perform at a later date….until now.
Researchers at Johns Hopkins University got 160 people between the ages of 18 and 30 to look at pictures of various things (ducks, etcetera) and to identify them as either “indoor” or “outdoor” objects. Shortly after this task, the participants received either a placebo tablet or a 200-mg caffeine pill. Then they left. 24 hours later, everyone was back at the study site looking at the same pictures.
The goal was to determine whether the pictures were old, new or the same. The people who had consumed caffeine after looking at the pictures the previous day were better at determining which ones were the same. The important takeaway here is that you can consolidate memories you want to retain by drinking coffee AFTER you hear something, read something or see something. Very interesting…
How does that work? Well, one hypothesis from the researchers is adenosine blockade (the same mechanism responsible for preventing fatigue). For more information about that, please see the Nature Neuroscience article.
Another Coffee Myth Bites the Dust…
In 1928, a study demonstrated caffeine’s diuretic effect, but that study was never validated. So 86 years later (in 2014), researchers at the University of Birmingham in England decided to test how caffeine impacts hydration status by conducting a switchover study on 50 men. (Women were excluded from this study, because menstrual cycles affect water balance.)
In this switchover study, some men drank 4 cups of coffee a day for 3 days, while others drank 4 cups of water a day for 3 days. After a 10-day wash-out period, they switched from coffee to water and vice versa. The researchers tested hydration status throughout by looking at body mass, total body water, and blood and urine tests. They found that caffeine did not alter hydration status. Drinking coffee contributed to hydration as much as water….Surprise!
So if you’re thirsty, looking for energy and interested in being healthy, drinking coffee just makes sense---and it tastes good too! If you want to remember everything you've read in this post, have a cup of coffee....then you can consolidate these ideas more easily. Comments are welcome!