Some say you should, some say you shouldn’t. I am the first to admit that when it comes to nutrition advice it can get awfully confusing! Up until recently nutrition recommendations have been fairly standard, based on the premise that everyone has the same nutritional requirements, with the small exception of gender and age group. However, recent research is uncovering that, because we are genetically unique, we may all have different nutritional requirements. Nutrigenomics looks at how individual genetic variation can have an effect on the body’s response to certain foods (Trujillo, Davis, & Milner, 2006).
Let’s take caffeine for an example. You open the latest health magazine to see the words you have been waiting for Coffee consumption decreases your risk of disease only to open up a different magazine to see the dreaded headline about how coffee is in fact increasing your risk of a heart attack. It’s no wonder everyone is confused!
These hugely confusing contradictions may actually have some credibility according to new research, and this all goes back to the fact that we are all individuals. Thereby meaning, depending on your genetic makeup, coffee can either be your tonic or your poison. Coffee is a major source of caffeine, which is metabolised by your body by the CYP1A2 enzyme. An enzyme usually carries two alleles that contribute to the way it functions (Yang, Palmer, & de Wit, 2010). Individuals who have two copies of the CYP1A2*1A allele are ‘rapid’ caffeine metabolisers, whereas individuals who carry the CYP1A2*1F allele are ‘slow’ caffeine metabolisers (Cornelis, El-Sohemy, Kabagambe, & Campos, 2006). So what significance does all this slow and fast business have on your health?
Quite simply, if you have the gene that makes the fast metabolising version of the enzyme, each time you drink coffee, your body will process and eliminate the caffeine very quickly limiting the negative effects it has on your body. Whereas if you have the slow metabolising version of the enzyme the opposite occurs. Therefore, if you have the slow metabolising gene, caffeine will have a greater effect on you thereby may increase your risk of heart disease. However if you’re a fast metaboliser it may not (outrageously unfair I know). (Cornelis et al., 2006). So, it literally is true - in terms of heart disease risk - coffee can either be beneficial or detrimental depending on your genotype. That may help shed a bit of light on all of the conflicting research we see on coffee!
So, all very well if you know your genotype, but until genotyping becomes readily available to the average person we are just going to have to make do with what we can. It seems like your best bet is to limit your intake to around 1-3 cups of coffee per day, everything in moderation they say right? But more importantly go with how you feel. Do you drink a coffee and essentially lose the plot? Jitters, anxiousness, sleeplessness and all the rest? Chances are you probably shouldn’t be drinking it. Does coffee in moderation perk you up and make you feel good? In that case you are probably safe to be consuming it and benefiting from its rich antioxidant profile.