|The insights may be based on data from a fruit flies, but the the differential effects of high vs. low taurine / caffeine ratios on wake-, respectively sleepfulness concur with my own N=1 experience.|
If you feel that's way too much, you may avoid one of them, but the way I know the average (=extraordinary ;-) SuppVersity reader, you will have downed them in less than 2 minutes, anyway and if you are lean and healthy the average effect is, as the first and good news is going to tell you will have little but beneficial effects on your ability to keep just that.
Too late? I mean, you're afraid it could keep you up, then I suggest you start with #3 of today's coffee-pot
And if you are one of the healthy skeptics out there, who are (rightly so) unwilling to believe that even something as delightful as coffee could have exclusively beneficial effects, you may like the taste of the 2nd cup from today's coffee party best.
The Good: "Habitual moderate coffee consumption shows significant inverse associations with MetS-related biomarkers possibly involving adiponectin, which is inversely related to visceral fat accumulation. " (Mure. 2013)
According to a recent study from the Wakayama Medical University School of Medicine in Japan (this is actually important, because much of the previous epidemiological data on the beneficial effects of coffee consumption comes from the Western world), two distinct models of multivariate regression analyses yielded almost identically beneficial inverse associations with visceral fat mass, visceral to subcutaneous fat mass (p<0.0001; no typo!) for those 330 study participants (average age 36–61 y) who consumed either 1-3 (low) or 4+ cups of coffee on a daily basis.
|Figure 1: Association of coffee consumption with adiponectin levels according to their MetS risk factors; according to model 2, i.e. adjusted for age, BMI, alcohol drinking, smoking, and walking status (Mure. 2013)|
Practically relevant specifically for the healthy folks among us
Interestingly, these associations became statistically significant in those participants who did not already suffer from metabolic syndrome and are thus particularly relevant for the average non-obese, non-metabolically deranged physical culturist who's trying to stay just that: Lean & healthy.
|Testosterone booster in men and estrogen amplifier in women? As if there were not already enough good reasons to get your daily dose of the 'kingly' brew - suggested read: "Can 5 Cups of Coffee Boost Testosterone to Estrogen Ratio in Overweight Men Transiently by Almost 200%?" (read more)|
Bottom line: In the end, it does all come down to the old adage of "Just because it's good for your neighbor, it must not necessarily be good for you as well!" In many previously discussed cases, this was the case for stuff that's highly beneficial for your obese neighbor, but in this case, it's the other way around: If Mr. Average Overweight American from next door mirrored your "moderate" coffee consumption (personally I can only repeat my previous recommendaton to stay below the 400mg/day margin, to play it save), he will - at best - experience no effects at all. In the worst case, it will exasperate his already existing insulin resistance and precipitate him to further metabolic derangements.
|Does it take 5 cups of coffee to battle breast cancer? (learn more)|
Where there is light, there must be shadow. Some shadow, namely the non-existence of the beneficial association between low to moderate habitual caffeine consumption and total, as well as high molecular weight adiponectin levels, has already been mentioned in the Mure study. A recently published study from the Universityof Sao Paulo does yet suggest that there may even be real downsides attached to the consumption of coffee... paper filtered coffee that is to say.
While the actual intention of the randomized cross-over study Corréa et al conducted was to compare the effects of ingesting medium light roast (MLR) or medium roast (MR) filtered coffee on plasma lipids, total homocysteine (tHcy), endothelial dysfunction–related inflammation biomarkers, glycemic biomarkers, and
BP in healthy volunteers, the average medical practitioner will certainly jump on the results to rant against coffee as the biggest evil... well, next to saturated fats obviously ;-)
|Figure 2: Relative changes in lipid profile and selected markers of inflammation in response to light (MLR) or medium (MR) roast filtered-coffee; data expressed relative to baseline (Corréa. 2013)|
Bottom line: Even if we consider increasing cholesterol levels as being a sign of impeding heart disease, the mere fact that the "healthy participants" had a mean of "only" 27.0 +/- 3.8kg/m² and body fat levels of 29.1% and 37.5% in the male and female participants, respectively, would warrant another reiteration of the "obese neighbor" mantra... and let's be honest, you don't really believe that the subjects in the dozens of epidemiological studies indicating that regular caffeine consumption has beneficial effects on heart health drank only true Italian espresso, do you? And even if they did - the study at hand does not imply that this would not entail similar increases in in cholesterol and inflammation in the not so skinny, but certainly pretty fat participants of the study at hand, right?
The Interesting: A high taurine:caffeine ratio promotes sleep, while a low ratio of taurine:caffeine inhibits sleep to a greater extent than the equivalent amount of caffeine alone (Lin. 2010)
While the results are not new - the pertaining study by Lin et al. is from 2010 - I am pretty sure that few of you will have heard about it. On the other hand, I bet that you may have been asking yourselves, why Red Bull & Co. contain an agent that is a mild GABA agonist - shouldn't that make you sleepy instead of spiking you up? Or is it rather like the "energy drink" producers say that it "mitigates" or even "promotes" the energizing effects of caffeine?
If we assume that human beings work anywhere similar like fruit flies (which is obviously hilarious, but not 100% unlikely, if we put an emphasis on "anywhere", here), then the data Lin et al. collected at the University of Pennsylvania, would suggest that the net result only depends on the dosage. If the ratio of taurine to caffeine is high the net effect will be sedative.
|Figure 3: Effects of caffeine, taurine and their combination in different amounts and ratios on sleep per hour and locomotor activity per 30min in fruits flies; data expressed relative to untreated control (Lin. 2010)|
Bottom line: While it would obviously be hilarious to assume that the exact same ratio that works for the fruit flies will work for human beings as well, it is certainly enlightening to see that (a) a ratio dependent does in fact exist and (b) that the "optimal" ratio of 12.5 units per taurine per unit of caffeine happens to be present in Red Bull, as well - and that despite it appears that the Carolina and Pennsylvania State scientists are among the few people who are not yet on the payroll of the omnipresent red bulls.
- Corrêa TA, Rogero MM, Mioto BM, Tarasoutchi D, Tuda VL, César LA, Torres EA. Paper-filtered coffee increases cholesterol and inflammation biomarkers independent of roasting degree: A clinical trial. Nutrition. 2013 Mar 16.
- Lin FJ, Pierce MM, Sehgal A, Wu T, Skipper DC, Chabba R. Effect of taurine and caffeine on sleep-wake activity in Drosophila melanogaster. Nat Sci Sleep. 2010 Sep 24;2:221-31.
- Mure K, Maeda S, Mukoubayashi C, Mugitani K, Iwane M, Kinoshita F, Mohara O, Takeshita T. Habitual coffee consumption inversely associated with metabolic syndrome-related biomarkers involving adiponectin. Nutrition. 2013 Apr 16.