Can’t get enough of coffee

There’s yet another place in town for the coffee connoisseur. Along with the established Highlander Coffee at Kampong Bahru, 40 Hands in Tiong Bahru, Papa Palheta at Tyrwhitt Road and Loysel’s Toy at Kampong Bugis by the Kallang Basin, coffee beans and brunch are on offer at Common Man Coffee Roasters on Martin Road. There’s also terribly good coffee at The Plain Cafe, and don’t get me started on Vietnamese drip coffee.

It’s certainly the answer to a productive day at work. Too much coffee though, might result in difficulties deciding which things on a long to-do list to actually do, a propensity to enthusiastically vacuum all carpet surfaces and wash dishes that don’t need washing till the wee hours, an uncanny ability to wax lyrical about just about anything, and in general, behaviour not unbecoming of the squirrel in Ice Age. Of course, perhaps this doesn’t happen to everyone.

But nonetheless, it’s of interest to know if all this coffee is actually good for us. A literature review in 2003 by Nawrot and colleauges indicates that moderate caffeine intake up to 400mg a day is not associated with increased health risks including osteoporosis and cancer, although recommendations also include limiting caffeine intake to under 300mg for women. These findings are reiterated in a subsequent review of epidemiological research. The authors of this 2006 review, Higdon and Frei, also document an association between cardiovascular disease risks and coffee consumption.

A recent summary of epidemiological studies and meta-analysis by Butt and Sultan further clarifies that caffeine consumption raises serum cholesterol. As such, moderating one’s caffeine intake has been suggested for individuals with hypertension, as well as children and older adults. In fact, this recent 2011 literature review suggests an inverse relationship between coffee consumption and the risk of some cancers or Alzheimer’s disease.

That’s assuming of course that one drinks coffee or tea in its purest form. Adding sugar and condensed milk to coffee or tea of course may undo the health benefits that caffeine is said to provide.

Interestingly, a recent study also reveals — in contrast to the USDA figures which puts caffeine in an espresso at about 77mg — that espressos on the Gold Coast in Australia had on average 106mg of caffeine. A fifth of the 97 espressos sampled in this 2007 study by Desbrow and colleagues had at least 120mg of caffeine. To consider the thought that the kopi o kosong gao that you’ve been overdosing on recently has much, much less caffeine than some of these espressos perhaps belongs in the category of unicorns, leprechauns and mermaids. 

More importantly, copious amounts of caffeine has deleterious effects on productivity. In a 2010 study by Rosekind and colleagues, employees reporting insomnia or insufficient sleep were found to be less productive than controls. Annual loss in fatigue-related productivity was estimated at US$1967 per employee. This is not surprising given that lack of sleep negatively impacts our capacity to learn and remember things.

The cognitive benefits are illustrated in Harvard Medical School educational videos about why sleep matters. Poor sleep which is linked to not only increased hunger and appetite and greater food consumption but also anxiety and depression — read this Mental Health Foundation (UK) report on why sleep matters — can have a profound effect on work performance.

Perhaps after you read this Huffington Post article (5 May 2013) on the 5 Things You Should Know About Sleep Health in the Workplace, you might want to switch over to light oolong. How about some 包種茶?