28 februarie 2012
E buna daca simti ca iti face bine. Asadar, consumati-o constient, observand reactiile corpului, nu doar asa…cu incredere in ce spune prospectul sau specialistul.
Se stie deja ca alimentele preferate de corp sunt cele neprelucrate in niciun fel. Ati putea manca spirulina daca nu ar fi incapsulata sau amestecata in diverse sucuri? Dar copiii vostri?
Temporar fac un pic de discriminare pentru cei care nu cunosc limba engleza, dar stiu ca nu sunt multi si vreau neaparat sa postez acest material azi, pentru ca am primit multe intrebari si mai dureaza pana am timp sa scriu un articol de sine statator.
Pe parcursul stagiilor mele de formare profesionala am avut de facut la un moment o cercetare ampla, asupra unui supliment alimentar (sau aliment deshidratat) pe care il consumam si sa vedem daca sunt posibile semne de intrebare in legatura cu el. Postez materialul meu direct in limba engleza, original.
Voi reveni asa cum am promis, pe larg, cu un articol despre suplimentele alimentare in general.
Spirulina – is a micro algae, a supplement made primarily from two species of cyanobacteria. Before being a pure vegetarian I used Spirulina because of its marketed weight loss properties (proven worng, by the way).
Since I delivered, it was recommended by the pediatrician as a supplement and breastfeeding stimulent, mainly due to its complete protein and B12 content.
The most compelling reasons I discovered to avoid taking this supplement:
1. Spirulina tablet algal health food is not suitable and reliable for use as a B12 source, especially in vegetarians.(1), (2). Companies which grow and market spirulina have claimed it to be a significant source of B12 although their claims are not accepted by medical literature and independent scientific organizations. Spirulina supplements contain predominantly pseudovitamin B12 (an analogue), which is biologically inactive in humans (3).
2. Possible contamination. Spirulina supplements may be contaminated with microcystins (a toxin produced by forms of cyanobacterium). This may cause gastrointestinal disturbances and, in the long term, liver cancer. Some countries and states require producers to strictly limit the concentration of microcystins in blue-green algae products, but the same protections cannot be assumed to have been applied to all products on the market. Furthermore, the maximum safe intake – if sanything like this exists – of microcystins is not clear.
Blue-green algae can also contain a different kind of highly toxic substance, called anatoxin.(4) When is grown with the use of fermented animal waste fertilizers, contamination with dangerous bacteria could occur (5). There are also concerns that spirulina might concentrate radioactive ions found in its environment.(6) Probably of most concern is spirulina’s ability to absorb and concentrate heavy metals such as lead and mercury if they are present in its environment (7).
3. Production process. The drying methods used may damage the nutritionla value, reducing it by 47-50%. One is not able to personally verify and confirm that the production protocols maintain the nutrients intact.
At present the scientific evidence meant to clarify the controversy about spirulina’s safety or its benefits for any condition do not suffice. When there is so much unclarity and debate arround a subject, I decide it is better to stay away from it. No more spirulina for me, thank you.
1.Watanabe F (2007). “Vitamin B12 sources and bioavailability.”
2. Watanabe F, Katsura H, Takenaka S, Fujita T, Abe K, Tamura Y, Nakatsuka T, Nakano Y (1999). “Pseudovitamin B(12) is the predominant cobamide of an algal health food, spirulina tablets.”
3. Dr. McDougall’s Newsletter, vol 6, no. 11 (http://drmcdougall.com/misc/2007nl/nov/b12.htm)
4. Astrachan NB, Archer BG, Hilbelink DR. “Evaluation of the subacute toxicity and teratogenicity of anatoxin”
5, 6. Facts and Comparisons. Spirulina Monograph. The Review of Natural Products.February 1998.
7. Johnson PE, Shubert LE. “Accumulation of mercury and other elements by Spirulina (Cyanophyceae)”