The intent of this blog is to promote health of human beings by applying scientific principles. I am using my previous electronic publication: The Pillars of Health: The Prelude, as a launching pad for discussion and to promote the scientific principles I believe to be accurate at this time. I tried to keep the language I used understandable for the layman but there were areas, which were somewhat technical. I encourage questioning anything I say or claim. I will update the chapters as we go.
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Thursday, December 20, 2012
A DIET FOR FIBROMYALGIA? FOODS ACCEPTABLE FOR FIBROMYALGIA AT THE RESTAURANT.
Regarding the diet for Fibromyalgia, with a couple of exceptions, it is basically the one found here: http://thepillarsofhealth.blogspot.com/2008/04/appendix-diet.html
For Fibromyalgia I prefer that the patient not have any products containing white flour, because of its refinement and the ease with which it is absorbed into the blood stream as glucose, which will elicit an insulin response which will inhibit adrenalin output, which we don’t want.
A practical principle here is to avoid high glycemic index foods. A nice list is here: http://www.health.harvard.edu/newsweek/Glycemic_index_and_glycemic_load_for_100_foods.htm
Another point is that there should be emphasis on protein intake (fish, chicken, turkey, eggs, cheese, etc.), as there is the need to keep the amino acid pool satisfactorily stocked with the building blocks for energy hormones, and neurotransmitters. In addition amino acids can act as a source for slow production of glucose (which shouldn’t initiate an insulin secretion response – I have not verified this factoid). This production of glucose takes place in the liver in a process called gluconeogenesis.
Acceptable restaurants foods for Fibromyalgia:
· Chicken paprikash without the dumplings or noodles. More sour cream or yoghurt and vegetables.
· Salads topped with chicken, or steak.
· Steak and eggs. For breakfast. Hold on the white bread.
Basically apply: no refined sugars and no white starches.
Thursday, November 29, 2012
Smoking and Depression
First, let us try and understand what cigarettes do as
relates to depression.
According to the American Heart Association, nicotine
addiction (I prefer calling it tobacco addiction because it is not only
nicotine that is addictive in the tobacco), has historically been one of the
hardest addictions to break, while the pharmacological and behavioral
characteristics that determine tobacco addiction are similar to those
determining addiction to heroin and cocaine.
Is there anything mystical about how cigarettes are
addictive? No. It is all very organic, and physical. The tobacco contains two
categories of chemicals that establish addiction in addition to the conditioned
reflex aspect (Pavlovian), which also fortifies the addiction. This last part
is more related to the whole process of the activity itself of the cigarette
touching the lips, the action of inhalation, the smell of the cigarette,
holding the cigarette, etc. As nicotine enters the body, it is distributed
quickly through the bloodstream and crosses the blood–brain barrier reaching
the brain within 10–20 seconds after inhalation. The elimination half-life of
nicotine in the body is around two hours.[i]
Tobacco smoke contains, in addition to nicotine (the first
category I alluded to above), the monoamine oxidase inhibitors harman and
norharman (the second category I alluded to above). These second category compounds
significantly decrease MAO activity in smokers. This was evidenced by positron
emission tomography imaging that showed smokers have a much lower activity of
peripheral and brain MAO-A (30%) and -B (40%) isozymes compared to non-smokers.[ii],[iii] MAO
enzymes break down monoaminergic neurotransmitters such as dopamine,
norepinephrine, and serotonin. It is thought that the powerful interaction
between the MAOIs and the nicotine is responsible for most of the addictive
properties of tobacco smoking.[iv] Therefore
when the activity of MAO enzymes is impeded these neurotransmitters are higher
in quantity (enhancing brain function artificially), but the flip side of this
is when the tobacco is gone the MAO enzymes increase and hence decrease those
neurotransmitters (at least temporarily. This translates into the withdrawal
syndrome from tobacco in addition to worsening of any depression state present.
The magnitude and duration of these phenomena will vary with how long and how
much the person has been using tobacco, and how healthy the individual is. In
other words a less healthy person will take longer to renovate their brain
neurotransmitter production compared to a healthier person.
As such a treatment strategy for you: target increasing the
neurotransmitters in the brain by all means possible which are safe if supervised:
- Decrease MAO enzymes activity by taking a MAO enzyme inhibitor drug. An example of this kind of drug is phenelzine (Nardil). [As a last resort only].
- Provide the building blocks for the neurotransmitters: i. Protein is the major component of almost all major currently recognized neurotransmitters. ii. Vitamin C is essential for the manufacture of certain neurotransmitters. iii. All the B-complexes play a significant role in the production of neurotransmitters and are of paramount significance for their function. iv. Good hydration. How this works is multifactorial and I won't go into here in biochemical/physiological detail. That being said, intake sufficient fluid to maintain urine color a very light light yellow. If you are sweating in your exercise routine then replace your losses with a fluid containing sodium chloride (salt), potassium and some magnesium. The last isn't as important as the first two, so if not present in the purchased fluid then no worries.
- Stimulate the production of adrenaline peripherally to stimulate neurotransmission and neurotransmitters in the brain. This is done by regular exercise targeting sweating 10 minutes per session in the beginning and later increasing that according to what your body tells you. Do one day per week (minimum), per decade of your age. If you are 28 years old then minimum three days exercise per week. If you are 44 years old, then five days per week, and so on.
- Avoid food substances that inhibit adrenaline production. Any food that leads to secretion of insulin in high quantities causes inhibition of adrenaline secretion. This would be all foods that are assimilated and absorbed rapidly into the blood stream as glucose (a simple sugar). Examples are all refined sugars and all white refined starch products. (Candy, candybars, pastries, pasta, lasagna, pizza, mashed potatoes, rice, etc.)
- Provide an environment to your body which enhances production and conservation of these neurotransmitters. In other words, sufficient regular sleep. To the tune of 8 hours per 24 hours. Preferably in one block.
- Stop smoking, start 7 mg patch nicotine (while awake) for two weeks, start the MAO enzyme inhibitor, all in addition to above.
- You must be off escitalopram for 10 days prior to starting MAO enzyme inhibitor. (They interact).
Comments:
- Overcoming the conditioned reflexes will take time. Think months to a year. So the craving triggered by memory will take a while to go away.
- The physical organic aspect of the addiction goes away quicker.
- Taking MAO enzyme inhibitors as an antidepressant medication is serious business and must be supervised closely by the prescribing physician. Avoid over the counter medications unless cleared by physician who is aware you are on a MAO enzyme inhibitor.
- Tobacco smoke will enhance the activity of the escitalopram in an ongoing fashion. (answering your question above.
- The nicotine content of popular American-brand cigarettes has slowly increased over the years, and one study found that there was an average increase of 1.6% per year between the years of 1998 and 2005. This was found for all major market categories of cigarettes.[v] So the sooner you quit the better.
References:
[ii] Herraiz
T, Chaparro C (2005). "Human monoamine oxidase is inhibited by tobacco
smoke: beta-carboline alkaloids act as potent and reversible inhibitors".
Biochem. Biophys. Res. Commun. 326 (2): 378–86.
[iii] Fowler
JS, Volkow ND, Wang GJ, et al. (1998). "Neuropharmacological actions of
cigarette smoke: brain monoamine oxidase B (MAO B) inhibition". J Addict
Dis 17 (1): 23–34.
[iv] Villégier
AS, Blanc G, Glowinski J, Tassin JP (September 2003). "Transient
behavioral sensitization to nicotine becomes long-lasting with monoamine
oxidases inhibitors". Pharmacol. Biochem. Behav. 76 (2): 267–74.
[v] Connolly,
G. N; Alpert, H. R; Wayne, G. F; Koh, H (2007). "Trends in nicotine yield
in smoke and its relationship with design characteristics among popular US
cigarette brands, 1997–2005". Tobacco Control 16 (5): e5.
doi:10.1136/tc.2006.019695. PMC 2598548. PMID 17897974.
Sunday, October 7, 2012
Is it safe to take 200-300mg of 5-HTP a day for Depression? Is Rhodiola Rosea useful for depression?
Depending
on the actual bioavailability provided by different 5-HTP preparations I would
say a good pure preparation of 100 mg daily should be a sufficient amount in
this situation. Taking too much could end up in a serotonergic reaction
(agitation, consciousness impairment, tachycardia, hallucinations, etc.)[1]. Therefore
with a reliable preparation, as seen with ‘PureEncapsulations’ I would stick to
100 mg daily only.
Rhodiola
Rosea: In Russia and Scandinavia, it has been used for centuries to cope with
the cold Siberian climate and stressful life.[2]
The theory is that is has a positive impact on serotonin, dopamine and acts as
a monoamine oxidase inhibitor. This would affect depression in a positive way.[3] In
light of what it can do and the lack of studies, and lack of standardization I would
only use it with a high degree of caution and under direct supervision of your physician
lest you trigger a sertonergic reaction as described above. I have never used
this substance before but after reading about it, it does look interesting.
For
depression: Are there any other herbs, amino acids, or vitamins you would recommend?
I also like Copper 2-3 mg once daily with a meal (which can be in a multivitamin).
Be cautious with other amino acids though as they can have some pretty
significant effects and side effects. Sometimes I will also use St. Johns Wort at 300 to 900 mg daily in divided doses. This last is a weak serotonin reuptake inhibitor.
[3] Monoamine
oxidase inhibition by Rhodiola rosea L. roots. [J Ethnopharmacol. 2009] -
PubMed - NCBI . http://www.ncbi.nlm.nih.gov/pubmed/19168123.
Accessed 10/7/2012 2012.
Sunday, May 27, 2012
How to Raise GABA (Gamma-amino-butyric acid) in the Brain by Natural Means
[Answering M.F.’s questions: You recently stressed that I need to
increase the levels of GABA in my body to help with my persistent anxiety. Are
there natural ways to do this through specific foods or even drinks, such as
loose leaf tea (due to its precursor l-theanine)?]
Background:
As a general rule, in promoting health I like
to stay as close as possible to letting and assisting the body in building its
own enzymes, hormones, different substances via its own machinery because of my
fear of disrupting the body’s magnificent equilibrium. This fear encompasses
different issues of feedback mechanisms, rate limiting steps, dependency
issues, etc.
Without further
ado: GABA (Gamma-amino-butyric acid) functions in
brain tissue as an inhibitory neurotransmitter by altering transmembrane
potential differences. Throughout the adult brain, where scientists have mostly
studied the roles of glutamate and GABA, it has been established that both
amino acids function primarily as signals transmitted between cells. Most of
the cells transmitting either glutamate or GABA signals are neurons. After
release, GABA diffuses a very short distance and binds to receptor proteins on
the surface of the target neuron, which are specialized for sensing either GABA
or glutamate via either glutamatergic or GABA receptors. GABA subsequently will
be taken up, or transported out by carrier proteins. The uptake process
requires energy and involves co-transport of GABA, which is neutral at physiological
pH, together with two sodium ions and one chloride ion.[3],[5] The
result of GABA stimulation of GABA receptors specifically serves to retard the
stimulatory effects of glutamate throughout the brain.
Why is it important for anxiety? All anxiogenic agents act on the
GABA-A receptor/chloride ion channel complex, implicating this neurotransmitter
system in the pathogenesis of anxiety and panic attacks.[7] As such increasing GABA
availability, and or increasing the efficiency/effect of, or sensitivity of GABA
receptors should help alleviate the feelings of anxiety.
How to
promote its availability: GABA (Gamma-amino-butyric
acid) can be formed from glutamic acid in the presence of pyridoxal
phosphate[1] (as a cofactor for glutamic
acid decarboxylase – GAD).[2] The pyridoxal phosphate
arises from vitamin B6 (pyridoxine). Therefore availability of B6 is necessary.
Don't overdo. Too much B6 has neurotoxic effects. 10 mg per day is easily
sufficient. Other factors that may promote healthy GABA metabolism would be
physiological levels of sodium and chloride (salt), in an ample fluid medium.
Practical translation: sufficient salt and water intake. Lyte-Hydrate well.
Valerian
raises GAD (glutamic acid decarboxylase) activity[4] which may raise GABA
(Gamma-amino-butyric acid) in the neuronal tissues which should have a calming
effect. The extract also contains GABA[8] which may have a direct impact on GABA
receptors.
Make sure the building block of GABA is
available (glutamic acid): All meats, poultry, fish, eggs, dairy products, and
kombu are excellent sources of glutamic acid. Some protein-rich plant foods
also serve as sources.[1]
To my knowledge only certain pharmaceuticals
(such as phenobarbitone) function as a GABA receptor modulator which enhances the
target function of said receptors.
Theanine: is an amino acid present in green tea which appears
to have stimulatory effects and inhibitory effects on glutamic acid. For calming
one would desire the inhibitory effect. How it works seems unclear to date
(5-28-12). As such I would think it would be okay to use although in this case
it is functioning more as a pharmaceutical agent and not as a building block. Theanine
is similar in molecular structure to glutamic acid and hence could be ‘pressuring’
glutamic acid and causing it to be more available for transforming into GABA. Here
I am theorizing. Then again it could be occupying glutamatergic receptors without
causing the usual excitatory activity which glutamic acid usually results in. Here
I am theorizing again.
References:
[1] Rodwell VW. Chapter 30. Conversion of Amino
Acids to Specialized Products. In: Bender DA, Botham KM, Weil PA, Kennelly PJ,
Murray RK, Rodwell VW, eds. Harper's Illustrated Biochemistry. 29th ed. New
York: McGraw-Hill; 2011. http://0-www.accessmedicine.com.library.ccf.org
[3] GABA as a Neurotransmitter and Neurogenic
Signal - eLS - Barker - Wiley Online Library . http://0-onlinelibrary.wiley.com.library.ccf.org/doi/10.1038/npg.els.0000121/full.
Accessed 5/13/2012 2012.
[4] R Awad, D Levac, P Cybulska, Z Merali, VL
Trudeau, JT Arnason (2007) Effects of traditionally used anxiolytic botanicals
on enzymes of the gamma-aminobutyric acid (GABA) system Can J Physiol Pharmacol
85: 933-942. Doi:10.1139/Y07-083.
[5] Nicotinic Acetylcholine Receptors - eLS -
Lindstrom - Wiley Online Library . http://0-onlinelibrary.wiley.com.library.ccf.org/doi/10.1002/9780470015902.a0000245.pub2/full.
Accessed 5/20/2012 2012.
[6] Russek, S. J. 2006. γ-Aminobutyric Acid
(GABA) Receptors. eLS.
[7] Reus VI. Chapter 391. Mental Disorders. In:
Longo DL, Fauci AS, Kasper DL, Hauser SL, Jameson JL, Loscalzo J, eds.
Harrison's Principles of Internal Medicine. 18th ed. New York: McGraw-Hill;
2012. http://0-www.accessmedicine.com.library.ccf.org/content.aspx?aID=9112222.
Accessed May 27, 2012.
Sunday, April 29, 2012
Why I'm a Fan of Copper
[Answering M.F.’s questions: What is the importance of taking
copper? Should everyone be taking 2mg of this supplement daily, separate from a
multivitamin? Or does this apply only to a specific group of individuals? Also,
is there an advantage to taking either the citrate or glycinate form in terms
of absorption?]
What is
the importance of taking copper? Copper is an integral part of numerous enzyme
systems, including amine oxidases, ferroxidase (ceruloplasmin), cytochrome-c oxidase, superoxide dismutase, and dopamine hydroxylase.
Copper is also a component of ferroprotein, a transport protein involved in the
basolateral transfer of iron during absorption from the intestine. As such,
copper plays a role in iron metabolism (important for blood formation), melanin
synthesis (important for skin color), energy production, neurotransmitter
synthesis, and nervous system function; the synthesis and cross-linking of
elastin and collagen; and the scavenging of superoxide radicals.[1]
From my viewpoint, the most important aspects
are for the insurance of presence of sufficient quantities of copper for the cross
linking of elastin and collagen and the dopamine hydroxylase.
The cross linking of elastin and collagen is of
immediate importance in the health of bones, joints, tendons, skin and hair
among other things. Of paramount importance though is the dopamine hydroxylase.
This is because this enzyme is necessary for the hydroxylation of dopamine to
noradrenalin which is the precursor to adrenalin.[2] I consider adrenalin to
be of supreme importance for health when generated physiologically naturally. Of
note here is that vitamin C (ascorbic acid) is a cofactor for the hydroxylation
of dopamine to noradrenalin.
Don't take more than the recommended 2-3 mg
daily, as at higher levels toxicity may ensue. (More isn't better). 10 mg
intake can be dangerous.[1] See table:
Deficiencies and Toxicities of Metals - from
Harrison's Online via AccessMedicine
|
It has been seen that copper did have a positive
impact on HDL (the cardioprotective cholesterol) and did lower oxidized LDL
values. This last is the type that tends to form the clogging cholesterol within
the walls of blood vessels (specifically arteries). The study showing this was somewhat
short for my taste and wasn’t consistent in its results but the logical tie-in
to the heart protective factors is solid.[3] This study used the glycinate
form of copper.
Another study shows that patients suffering from
diabetes mellitus have lower levels of copper in their serum compared to
control patients.[4] Again the tie-in here is logical.
Should everyone be taking 2mg of this supplement daily, separate from
a multivitamin? Individuals
whose nutrition is deficient or low in copper intake should take a separate
supplement. Dietary sources of copper include shellfish, liver, nuts,
legumes, bran, and organ meats. For myself I prefer not to take a chance on not
getting enough of this essential mineral and hence take it anyway separate from
the copper from other sources. By taking it separately as a 2 mg pill/capsule in addition to a usual 2 mg in the multivitamin tablet then we cap at 4 mg per day plus nutritional
sources. We stay well below the 10 mg/day toxic level.
Is there an advantage to taking either the citrate or glycinate form
in terms of absorption? It would appear that, at least in animals the glycinate
form will provide superior bioavailability of the nutrient, compared to the citrate.
That being said I personally take the citrate form as I also take a multivitamin
tablet three times weekly, in addition to regular food intake.[5]
References:
[1] SP Russell RM (2012) Chapter 74. Vitamin
and Trace Mineral Deficiency and Excess. In: Longo DL, Fauci AS, Kasper DL,
Hauser SL, Jameson JL, Loscalzo J, eds. (ed), Harrison's Principles of Internal
Medicine. 18th ed. edn., McGraw-Hill, New York, pp http://0-www.accessmedicine.com.library.ccf.org/content.aspx?aID=9099706.
[2] Molina PE. Chapter 6.
Adrenal Gland. In: Molina PE, ed. Endocrine Physiology. 3rd ed. New York:
McGraw-Hill; 2010.
http://0-www.accessmedicine.com.library.ccf.org/content.aspx?aID=6169718.
Accessed April 29, 2012.
[3] RA Disilvestro, EL
Joseph, W Zhang, AE Raimo, YM Kim (2012) A randomized trial of copper
supplementation effects on blood copper enzyme activities and parameters
related to cardiovascular health Metabolism Doi:10.1016/j.metabol.2012.02.002.
[4] M Basaki, M Saeb, S
Nazifi, HA Shamsaei (2012) Zinc, Copper, Iron, and Chromium Concentrations in
Young Patients with Type 2 Diabetes Mellitus Biol Trace Elem Res
Doi:10.1007/s12011-012-9360-6.
[5] Ammerman CB, Baker DH. Bioavailability
of Nutrients for Animals: Amino Acids, Minerals, Vitamins. Chapter 7. Copper Bioavailability.
Pp. 127-156. Link.
Monday, January 2, 2012
Chapter 10: Depression
Opinion: It is time to relegate Freudian theories to the museum and to realize that emotions, feelings, mood and thinking are results of organic processes in the body and brain interacting with the environment. Healthy organic processes can handle bad memories.
We have repeatedly heard that depression is due to an imbalance of chemicals in the brain without specification of those chemicals and why they even became imbalanced. I will outline to you what I think is amiss and how to prevent and alleviate the condition of depression.
By not following The Pillars described in previous chapters, we run the risk of not having certain chemicals in our brains in sufficient amounts to function correctly. Specifically these chemical deficiencies are those, which are responsible for thinking, memory, feeling happy, libido, good sleeping and just overall energy. To name the main players I will mention serotonin, endorphins, TRH, GABA, adrenaline and thyroxin. Cortisol is also a player but I think that in depression it gets produced in a chaotic excess pattern more than that it is in a deficient state. So depression can ensue by not having good nutrition (vitamins included), not having enough physical activity, not sleeping regularly and not avoiding harmful substances, or a combination in varying degrees of some or all of the above.
Stress is another player that I would like to talk a little about. If a person is healthy and gets exposed to severe acute emotional stress then their reserves of the chemicals mentioned above will be drawn upon and they will be able to withstand the onslaught and not develop depression. But, if the stress is long enough, the reserves will be depleted and the depression syndrome will develop. On the other hand an unhealthy person can develop depression even without emotional stresses.
Another factor is that people who have abused their bodies with harmful substances which shut down the body’s own “machinery” for producing the chemicals above, will be much more likely to develop depression. An example of this is people who have been addicted to narcotics will have deconditioned endorphin-producing tissue. This will of course predispose them to depression but the degree of predisposition will vary with how much and how long they were addicted. Alcohol will hurt the body in a similar way. In general my advice for curing the common form of depression is to apply The Pillars Of Health judiciously and use antidepressant medicines temporarily as a helping tool. Once reasonable improvement has occurred then the antidepressants may be weaned off.
Supplements of 5-HTP, and tyrosine are beneficial in this context and will assist above curing process and assist the onboard antidepressant by supplying the building blocks for serotonin in the instance of 5-HTP, and adrenaline and noradrenaline in the instance of tyrosine. This must be done under your doctor’s supervision.
We have repeatedly heard that depression is due to an imbalance of chemicals in the brain without specification of those chemicals and why they even became imbalanced. I will outline to you what I think is amiss and how to prevent and alleviate the condition of depression.
By not following The Pillars described in previous chapters, we run the risk of not having certain chemicals in our brains in sufficient amounts to function correctly. Specifically these chemical deficiencies are those, which are responsible for thinking, memory, feeling happy, libido, good sleeping and just overall energy. To name the main players I will mention serotonin, endorphins, TRH, GABA, adrenaline and thyroxin. Cortisol is also a player but I think that in depression it gets produced in a chaotic excess pattern more than that it is in a deficient state. So depression can ensue by not having good nutrition (vitamins included), not having enough physical activity, not sleeping regularly and not avoiding harmful substances, or a combination in varying degrees of some or all of the above.
Stress is another player that I would like to talk a little about. If a person is healthy and gets exposed to severe acute emotional stress then their reserves of the chemicals mentioned above will be drawn upon and they will be able to withstand the onslaught and not develop depression. But, if the stress is long enough, the reserves will be depleted and the depression syndrome will develop. On the other hand an unhealthy person can develop depression even without emotional stresses.
Another factor is that people who have abused their bodies with harmful substances which shut down the body’s own “machinery” for producing the chemicals above, will be much more likely to develop depression. An example of this is people who have been addicted to narcotics will have deconditioned endorphin-producing tissue. This will of course predispose them to depression but the degree of predisposition will vary with how much and how long they were addicted. Alcohol will hurt the body in a similar way. In general my advice for curing the common form of depression is to apply The Pillars Of Health judiciously and use antidepressant medicines temporarily as a helping tool. Once reasonable improvement has occurred then the antidepressants may be weaned off.
Supplements of 5-HTP, and tyrosine are beneficial in this context and will assist above curing process and assist the onboard antidepressant by supplying the building blocks for serotonin in the instance of 5-HTP, and adrenaline and noradrenaline in the instance of tyrosine. This must be done under your doctor’s supervision.
Does light or sunlight play a role in depression?
Light, especially sunlight definitely plays a role and this becomes most evident in the condition of seasonal affective disorder (SAD). The importance of light as a corrective treatment in SAD, with results superior to placebo has been established.[1]
What appears to happen in SAD, is production of the neurotransmitter serotonin is disrupted. It has been seen that the turnover (production and metabolism) of serotonin by the brain was lowest in winter, and more significantly the rate of production of serotonin by the brain was directly related to the prevailing duration of bright sunlight. The production rose rapidly with increased light intensity.[2] In a situation of lower production of brain serotonin then we can anticipate the presence of depressive symptoms of tiredness, dejectedness, appetite changes (possibly anorexia or maybe increased desire for carbohydrates) and so on.
I don't believe vitamin D plays a major role in SAD, although I would anticipate it may have a minor one, by virtue of its importance in calcium and phosphate absorption. It has been seen to have a positive impact on depression.[3] This stance should not be interpreted as belittling the role of vitamin D in health as I am a big proponent of its supplementation into our diets.
[Rev.1/2/2012]
References:
[1] B Byrne, GC Brainard (2008) Seasonal Affective Disorder and Light Therapy Sleep Medicine Clinics 3: 307 - 315. Doi:10.1016/j.jsmc.2008.01.012.
[2] G Lambert, C Reid, D Kaye, G Jennings, M Esler (2002) Effect of sunlight and season on serotonin turnover in the brain The Lancet 360: 1840 - 1842. Doi:10.1016/S0140-6736(02)11737-5.
[3] Women's mental health: depression and anxiety. Nursing Clinics of North America - Volume 44, Issue 3 (September 2009)
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