|19 Billion Euro that's the estimated 2011 financial burden due to lung cancer, alone, here in Europe and the On Short Notice figure of the week (information based on ESMO2012 press release)|
Problems thinking straight? Guess what: 3-4 cups of coffee could help :-) According to a soon-to-be-published paper by scientists from the Jordan University of Science and Technology in Irbid, Jordan, the ingestion of the human equivalent of approximately 3.8mg caffeine per kg body weight or 3-4 cups of coffee per day, can inhibit both, the stress, related as well as diet induced (we are talking of the "typical" Western diet (WD), that's both high in carbohydrates and fat) cognitive impairments (Alzoubi. 2012)... well, at least in the researchers 3-months rodent study it worked like a charm
- learning trial: animals in the caffeine/stress, caffeine/WD, and caffeine/stress/WD groups made fewer errors, than non-supplemented stressed or WD animals; overall their performance was comparable to those of the control
- memory tests: treatment reduced the number of error and restored short-term memory and long-term memory during chronic stress and/or WD (P < 0.05) to normal levels
Additionally, caffeine has also been shown to increases the expression of hippocampal brain-derived neurotrophic factor (BDNF) and its receptor, which is impaired in response to chronic stress and a hypercaloric Western diet (Aleisa. 2006; Molteni. 2004) and leads to deteriorations in cognitive performance. In the long run those effects could also contribute to the anti-dementia and anti-Parkinson's effects, I mentioned in the recent SuppVersity post on the insulin sensitizing effects of coffee.
To probe the effects of acute caffeine ingestion on cognitive performance and the influence of previous caffeine consumption and withdrawal, Andrew P Smith, Gary Christopher and David Sutherland recruited 70 volunteers (25 male, 45 female; mean age 22.8 years). The 35 consumers (>100mg caffeine /day, mean 300mg; range 110–600 mg) were put on withdrawal and tested on day 2, alone and without caffeine, and day 8 together with the non-consumers in a double-blind placebo-controlled fashion. During the caffeine challenge, the cognitive performance was tested twice, once before and once 30min after the provision of the caffeinated beverages.
Anxious, but smart: Caffeine gives you the edge
The results of the trial clearly indicate that the ingestion of 2 mg/kg of caffeine, which were served in decaffeinated coffee or tea 30min before the testing procedures, were associated with faster simple reaction times, fewer long responses, greater detection of targets in the cognitive vigilance task, and faster encoding of new information.
"The results confirmed previous findings, with ingestion of caffeine being associated with a faster simple reaction time, fewer long responses, more targets detected and faster encoding of new information. There were no main effects of consumer status, nor were there any significant interactions between caffeine and consumer status." (Smith. 2012)Notwithstanding, I believe that many of you will probably be more interested in the effects of caffeine withdrawal on overall withdrawal symptoms (figure 1, top), as well as the alertness, hedonic tone and anxiety (figure 1, bottom) and the cognitive performance on day 2 of the withdrawal period (figure 2, left), than in any of the well-established performance cognitive performance boost, right?
|Figure 2: Performance on day 2 of withdrawal phase (w/out caffeine) and on day 8 before (w/out caffeine) and after (w/ caffeine)the ingestion of decaffeinated tea or coffee with 2mg/kg caffeine in it (data based on Smith. 2012)|
Outside of controlled experiments "real" coffee and tea do at least as well
Since a large cup of coffee contains about the same amount of caffeine the scientists simply added to decaffeinated beverages, to ensure that the drinks could not be distinguished (by their smell for example), you can simply stick to your regular coffee and if you want to enjoy similar benefits. And to be honest, in view of the plethora of benefits of chronic low dose coffee consumption, I would not even think for a second about whether or not you may be missing out on the occasional boost, when you are not "going on withdrawal" from time to time...
|Figure 3: W/out arginine (Arg-) intestinal epithelial cells can't proliferate (graph based on Stadelmann. 2012)|
Provision of additional arginine + citrulline can help ... in the short run
Now, the good news about all that is that the in-vitro data in figure 3 clearly suggests and anecdotal, as well as the effective therapy of diarrhea patients with arginine/citrulline actually confirm that the provision of supplemental arginine (or citrulline) constitutes a cheap and readily available way to ameliorate the decay, until the bugs have been eradicated by antimicrobial drugs.
A pros pos, antimocrobial drugs, with regard to latter, Noa Tejman-Yarden and Lars Eckmann write in a recent review of the latest drug innovations, that despite the fact that metronidazole and other antimicrobials are usually effective, "treatment failures are common and antimicrobia resistance occurs" (Tejman-Yarden. 2011), so that it would appear as if complex derivatives of 5-nitroimidazole and benzimidazole, which form the core structure of the most widely used antigiardial drugs, will replace them in the short-run. At least for so long, until several new classes of antigiardial drug candidates that have already been identity by high-throughput screening of large compound libraries, will eventually hit the market (Tejman.Yarden. 2011)
More about vitamin B6: Helps with neurotransmitters synthesis; is involved in nerve function and necessary for normal brain development & function; influences mood, and melatonin production; effects circadian clock; is needed for B12 absorption and thus red blood cell productionn6:n3 ratio does not depend on dietary intake alone: A marginal deficiency in vitamin B6 will skew your serum PUFA levels towards the N6-side That's the long and short of the results of a study that's going to be published in the October issue of the Journal of Nutrition.
When low: "Pins and needles" in extremities, mental disorders, seborrheic dermatitis, estrogenic PMS, dizziness, irritability, kidney stones, abnormal EEG, anemia, convulsions, edema (water retention), hypothyroidism, migraine-headaches, glossitis, lymphopeniaWhen high: Depression, suicidal tendencies, severe fatigue, mood swings, low blood sugar, migraine-headaches, heart palpitations, thyroid abnormalities (hyper- in the short, hypo in the long term), numbness in hands and/or feet, spinal / nerve degeneration, muscle spasms / cramps, osteoporosis, arthritis, higher blood pressure (short-term suppl.), lower blood pressure (long-term suppl.), mineral imbalances (high phosphor & magnesium vs. low sodium & calcium), restlessness, insomnia, vivid dreams, decreased estrogen & prolactin, depressive PMS.
RDA (adults): 1.3 mg*
*higher for pregnant women & >50y
*higher for pregnant women & >50y
Upper tolerable limit: 30-100mg*Food sources: chicken, turkey, tuna, salmon, shrimp, beef liver, milk, cheese, lentils, beans, spinach, carrots, brown rice, bran, sunflower seeds, wheat germ, and whole-grain flour
*depending on the source of information
*depending on the source of information
Mei Zhao and her colleagues analyzed the fatty acid profiles in plasma, erythrocytes, and peripheral blood mononuclear cells (PBMC) of healthy men and women who had been fed a low-vitamin B-6 (pyridoxine) diet for 28 days and observed that contrary to the plasma HDL and LDL cholesterol concentrations, the amount of free fatty acids (FFA) in the blood and the erythrocyte and PBMC membrane fatty acid compositions, neither of which showed any statistically significant changes, the amount of all long-chain polyunsaturated fatty acids, i.e. arachidonic acid (n6) and EPA and DHA (n3) decreased from 548 ± 96 to 490 ± 94 μmol/L, 37 ± 13 to 32 ± 13 μmol/L, and 121 ± 28 to 109 ± 28 μmol/L, respectively.
The subsequent 8% increase in the total n6:n3 PUFA ratio from 15.4 to 16.6 is not alarming, but if this trend would continue linearly, it would certainly become problematic, in the long run. Moreover, the decrease in both n6 and n3 long-chain PUFAs (of which people tend to forget that the "inflammatory" arachidonic acid is as vitally important as its "anti-inflammatory" omega-3 counterparts) could provide an alternative / complementary mechanistic explanation for the increased cardiovascular disease risk that has been associated with vitamin B-6 deficiency.
In view of the fact that the RDA is not exactly high and can easily be achieved from dietary sources, along (as long as you follow a diversified whole foods diet), and considering the fact that high levels of B6 have been associated with more negative side-effects than B6 deficiency (see infobox on the right; please note that I collected the information on a couple of trustworthy websites on RDAs & co and did not verify the research on each of them!), I would however caution against the typical Western "more helps more" supplementation mentality.
|Figure 4: Easy come, easy go - the mass you gain and the fat you lose by doing nothing than simply injecting testosterone is lost / regained within 6 months after discontinuation of the "testosterone therapy" (Forbes. 1992); read more about the role of testosterone in skeletal muscle hypertrophy in the Intermittent Thoughts on Building Muscle|
- health related: "Vitamin D: We probably won't know before 2017, whether supplementation is advisable", "Aromatase inhibitors to treat endometriosis", or
- muscle related: "The muscle sparing effects of CLA + Omega-3" and a true classic "Muscle mass gained on injectable testosterone is lost, when injections are seized",
- Aleisa AM, Alzoubi KH, Gerges NZ, Alkadhi KA. Chronic psychosocial stress-induced impairment of hippocampal LTP: possible role of BDNF. Neurobiology of Disease 2006;22:453–62.
- Alzoubi KH, Abdul-Razzak KK, Khabour OF, Al-Tuweiq GM, Alzubi MA, Alkadhi KA. Caffeine prevents cognitive impairment induced by chronic psychosocial stress and/or high fat-high carbohydrate diet. Behav Brain Res. 2012 Sep 20.
- ESMO. Press releases related to the ESMO 2012 Congress of the European Society for Medical Oncology in Vienna.
- Forbes GB, Porta CR, Herr BE, Griggs RC. Sequence of changes in body composition induced by testosterone and reversal of changes after drug is stopped. JAMA. 1992 Jan 15;267(3):397-9.
- de Mendonca A, Ribeiro JA. Endogenous adenosine modulates long-term potentiation in the hippocampus. Neuroscience 1994;62:385–90.
- Molteni R, Wu A, Vaynman S, Ying Z, Barnard RJ, Gomez-Pinilla F. Exercise reverses the harmful effects of consumption of a high-fat diet on synaptic and behavioral plasticity associated to the action of brain-derived neurotrophic factor. Neuroscience 2004;123:429–40.
- Smith AP, Christopher G, Sutherland D. Acute effects of caffeine on attention: a comparison of non-consumers and withdrawn consumers. J Psychopharmacol. 2012 Sep 19.
- Stadelmann B, Merino MC, Persson L, Svaerd SG. Arginine Consumption by the Intestinal Parasite Giardia intestinalis Reduces Proliferation of Intestinal Epithelial Cells. PLoS ONE. 2012; 7(9): e45325.
- Tejman-Yarden N, Eckmann L. New approaches to the treatment of giardiasis. Curr Opin Infect Dis. 2011 Oct;24(5):451-6.