Delhi Psychiatry Journal 2010; 13:(2) © Delhi Psychiatric Society
Yeast Infection and Psychiatric disorders
Malhotra S*, Nirmaljit Kaur*, Bhatia MS**, Kumar P*, Hans C*
*Department of Microbiology, Dr RML PGIMER and Hospital, New Delhi-110001.
** Department of Psychiatry, UCMS & GTB Hospital, Delhi-110095
Introduction
Millions of people suffer from depression
caused by multiple factors including certain
infections like candidiasis every year and the cause
in most cases is not known and this can be attributed
to the fact that in modern medicine and CNS, there
are very few knowns. It is well known that yeast
like Candida albicans can penetrate any area of the
body including CNS and henceforth there could be
a link between Candida infection and depression.
It has been observed that sign and symptoms of
yeast infection include skin rash, fatigue, headache,
irritability, intestinal pain, respiratory disorders,
urinary problems, vaginitis and depression1. Other
symptoms include digestive disorders hypoglycemia,
hyperactivity, memory loss, impotence,
learning difficulty, menstrual problems,
premenstrual tension and short attention. As evident
from the above list many symptoms are associated
with nervous system which plays a role in
psychiatric diseases. So we review this topic to
understand and highlight the correlation between
yeast infection and psychiatric disorders.
Terminology
Depression: is a universally understood
condition of sadness and despondency where patient
feels that life has lost its luster. People normally
recover from such gloomy spells and may carry on.
Some conditions of sadness may require lifestyle
changes such as resolving a rocky marriage,
dropping bad habits, or removing oppressive factors
from one’s life. Still other situations may require
the counsel of a good friend or priest or ministersomeone
one can trust and discuss his or her
troubles with. However sometimes people don’t
recover from life’s setbacks. Or they become
depressed over insignificant matters for no reason
at all. The feelings of sadness may simply slow them
down or can debilitate them to the point where they
weep continuously, cannot function in life or may
consider suicide. These are the situations where an
emergency psychiatric treatment is required2.
Causes of depression: When a person remains
depressed despite normal efforts to treat the
depression, a physical source of the depression
should be considered. This is particularly true in
the case of debilitating or suicidal depression2.
Physiological causes of depression are very
common, like endocrinal disorders in the form of
hypothyroidism.
Physical causes of depression include:
Nutritional deficiencies, lack of exercise, hypothyroidism,
hyperthyroidism, fibromyalgia, candida
(yeast infection), poor adrenal function, other
hormonal disorders including (cushing’s disease
(excessive pituitary hormone production, addison’s
disease (low adrenal function), high levels of
parathyroid hormone and low levels of pituitary
hormones), hypoglycemia, food Allergies, heavy
metals (such as mercury, lead, aluminium,
cadmium, and thallium), selenium toxicity,
premenstrual syndrome and sleep disturbances.
Infectious causes: AIDS, influenza, mononucleosis,
syphilis (late stage), tuberculosis, viral
hepatitis and viral pneumonia
Medical ailments/causes: Heart problems,
lung disease, diabetes, multiple sclerosis,
rheumatoid arthritis, chronic pain, chronic
inflammation, cancer, train tumors, head injury,
multiple sclerosis, parkinson’s disease, stroke,
temporal lobe epilepsy, systemic lupus
erythematosus and liver disease
Drugs related causes: Tranquilizers and
sedatives, antipsychotic drugs, amphetamines
(withdrawal from), antihistamines, beta blockers,
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high blood pressure medications, birth control pills,
anti inflammatory agents, corticosteroids (adrenal
hormone agents, cimetidine, cycloserine (an
antibiotic), indomethacin, reserpine, vinbiastine and
vincristine
Candidiasis – Common yeast infections called
candidiasis is caused by the yeast Candida albicans
which thrives in the large intestines of human body.
Yeast infections can manifest on skin, mouth or
systemic sites. It affects people of all ages and both
sexes3.
Pre disposing factors – Moist environment
supports fungal growth and that’s the
reason most of fungi exist as saprophytes
in soil. Whenever human body’s immune
system gets compromised, fungal infections
manifest as opportunistic pathogen. The
prevalence of fungal infections has
increased since 1980 since the emergence
of HIV which causes AIDS where patient
is bound to get opportunistic fungal
infections when the CD4 count falls ,<500.
Of all the identified fungal mycosis, yeast
infection account for almost 70-80% of
infections4.
Stages of Candidiasis – Today there are
millions of people in USA and other
countries who do not feel well and do not
seen to get a definitive answer as to why.
One potential reason which could be
hypothesized is of is the overgrowth of
Candida. While the human body has
abundant normal flora including Candida,
excess of Candida gives rise to any kind of
physical problem in the form of instant
fatigue, sugar craving, weight gain, lower
concentration, confusion, bloating, low
blood sugar, sensitivity to smells/alcohol,
migraine/headache and depression. The
course of Candidiasis has been divided into
following 5 stages3.
Stage One – During the first stage of Candida
infection, the mucosal lining or mucous membrane
become infected leading to allergic reactions along
with various types of infections such as
streptococcus throat, bronchiolitis, pneumonia,
tonsillitis, mononucleosis, sinusitis etc5.
Stage Two – This stage manifests in the form
of headache or migraine, joint pain, fatigue,
arthritis, nail infection, muscle soreness etc. due to
over production of certain metabolic chemicals by
Candida.
Stage Three – This is the stage during which
patient develops behavioral and psychiatric
problems. This includes decreased concentration,
mood swings, depression, forgetfulness and
confusion. At this stage, the patient feels out of
control. Patients may land up in severe depression
leading to thoughts of suicide, irrational fears, panic
attacks, phobias, epilepsy and uncontrolled
violence.
Stage Four – As Candida continues to grow
and destroy the body cells, organ system within the
body start reacting negatively and target towards a
shutdown e.g. when Candida infections affects GIT,
patient may not feel like eating and also the
absorption of nutrients from GIT also get
compromised. It is also hypothesized that it can
affect CVS and lead to hypertension, numbness of
extremities, bruising, and palpitations etc6. During
the fourth stage, endocrine system may also get
affected along with musculoskeletal system and
respiratory system.
Stage Five – In the fifth and final stage, the
person would land up with systemic spread of
Candida which can prove to be fatal7.
Possible Etiologies
Role of Tartaric acid in Autism: Innumerable
studies in past have implicated the role of abnormal
organic acid produced by GIT flora in causing
human diseases e.g. inborn errors of metabolism
like phenylketonuria, tyrosinemia, maple syrup
urine diseases etc. The same have been
hypothesized as playing a role in psychiatric
diseases like, autism, schizophrenia, Alzheimer’s
diseases and even fibromyalgia. Urine organic
testing in all these clinical conditions has shown
elevated excretions of acidic products8.
These metabolic end products associated with
Candida infection is tartaric acid. This compound
forms sludge in the wine brewing process and has
to be removed. Wine is sugar water fermented by
yeast saccharomyces cerevisiae to alcohol and other
yeast products. Humans do not produce this
chemical.
Effect of antifungal agents on Tartaric acid:
There are a lot of clinical cases where the
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psychiatric symptoms in patient have been
controlled by giving antifungal treatment to the
patient e.g. a two year old patient was being
evaluated for autism and his urine tested positive
for organic acids. The child had been treated several
times for ear infection with antibiotics and had
developed oral thrush. Child’s behavior was badly
affected and he became hyperactive with insomnia,
lost his speech and eye contact with parents. Since
child’s organic acids including tartaric acid was
elevated in urine, a differential diagnosis of yeast
infection was kept in mind and he was started on
topical Nystatin (oral thrush). The child’s behavior
improved within a week and elevated organic acids
decreased in urine although it took over 60 days
for the urine tartaric acid to return to normal range8.
After 68 days of treatment the child’s mother
started running out of Nystatin and began giving
only half doses. During that time the tartaric acid
starting increasing. When she got the Nystatin
prescription refilled and restored the full dose of
Nystatin, the tartaric acid decreased. Thus it was
proved that Nystatin causes a marked reduction in
the urine tartaric acid. The other significant finding
was that even after two months of Nystatin, the
biochemical abnormality can reappear within a
short time of stopping the antifungal drug. Even
after six months of antifungal treatment, there is
often a biochemical “rebound” and loss of
improvements after discontinuing antifungal
therapy. This rebound also occurs after other
antifungal drugs as well. Several explanations are
possible for this phenomenon. One reason could
be that because of one or more defects in the
immune system such as lgA deficiency lgG
deficiency, or severe combined immunodeficiency
disease (SCID) which are found in most children
with autism, the yeast, which are everywhere in our
environment including the food we eat, repopulate
the intestinal tract very rapidly and these yeast being
very resistant may not be completely eliminated
even after six months of antifungal therapy. Another
theory proposed is that the yeast can genetically
transform some of the human cells that line the
intestinal tract and thus some of the human cells
then contain yeast DNA due to transformation.
These genetically transformed human cells produce
both yeast and human products and are somewhat
sensitive to antifungal drugs but are not killed by
them and produce yeast products whenever
antifungal drugs are absent. Moreover some of the
yeast are embedded deep in recesses of the intestinal
tract or in the deeper layers of the mucosa that lines
the intestine where they are relatively safe from the
drug. Although their numbers are small, they readily
repopulate the intestine after antifungals are
stopped. The most logical explanation given from
immunology.8
In addition to the immune system taking
inventory of its own cells, it seems increasingly
likely that the immune system also takes an
inventory of bacteria and yeast cells present in the
intestinal tract soon after birth. This inventory is
performed by a group of cells called the CD5 +Bcells,
which are among the which are among the
very first immunological cells to appear in the
developing embryo and appear to play a role in
tolerance to intestinal microorganisms in postnatal
life. These cells may play a role in regulating the
secretion of lgA, the antibody class that is secreted
into the intestinal tract and which may select which
microorganisms are tolerated in the intestinal tract.
Furthermore, the eradication of normal flora
especially when antibiotics are administered
repetitively during infancy may cause the
CD5+cells to reject these normal organisms at a
later age. Any cells that are on this early inventory
may be awarded immune tolerance and will not be
attacked later on by the immune system. Either
antibiotic use in infancy or yeast infection of the
mother during pregnancy may result in later immune
tolerance to yeast.
Response of Children with Autism to
Antifungal Therapy: Improvements commonly
cited by parents of autistic children treated with
antifungal therapy include: decreased hyperactivity,
more eye contact, increased vocalization (more
words and more usage), better sleep patterns, better
concentration, increased imaginative play, reduced
stereotypical behaviors (such as spinning objects),
and better academic performance.
More than 1000 children with autism have been
treated with a wide variety of antifungal agents such
as Nystatin, Lamisil, Sporanox, Nizoral, Diflucan,
caprylic acid, grapefruit seed extract, and garlic
extract with good clinical response in perhaps 80-
90%7. A survey of parents of autistic children by
Rimland reports that antifungal therapy is ranked
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the most effective (by a wide margin) of all drug
therapies used for the reduction of autistic
symptoms9.
Molecular Basis of Tartaric Acid Toxicity in
autism: Patients with autism generally excrete
tartaric acid in urine and it has been observed that
many of these patients have accompanying
hypotonia8. Biopsy of the muscle of autistic patients
with hypotonia revealed normal structural features
except for an unexplained “granularity” by electron
microscopy. Electromyography, EEG’s, brain scans,
and nerve conduction velocities have been found
to be all normal. Literature indicates that tartaric
acid is a highly toxic substance. As little as 12 gm
can cause human fatality with death occurring from
12 hours to 9 days after ingestion. Gastrointestinal
symptoms can be marked (violent vomiting and
diarrhea, abdominal pain, thirst) followed by
cardiovascular collapse and/or acute renal failure.
This compound especially damages the muscles and
the kidney and may even cause fatal human
nephropathy (kidney damage).
A Korean study found that a patient with autism
had a value of 6000 mmol/mol creatinine, a value
that is about 600 times the median normal value.
Assuming that the yeast in the intestine of the child
were producing tartaric acid at a constant rate, this
child was exposed to 4.5 grams per day of tartaric
acid, (over one-third of the reported lethal dose of
tartaric acid!) The child’s was given antifungal
treatment for 6 weeks and his Creatinine value
returned to normal within few weeks8.
Mechanism of Tartaric acid toxicity: Tartaric
acid is an analog (a close chemical relative) of malic
acid (Figure 1). Malic acid is a key intermediate in
the Krebs cycle, a biochemical process used for the
extraction of most of the energy from our food.
Presumably tartaric acid is toxic because it inhibits
the biochemical production of the normal
compound, malic acid. Tartaric acid is a known
inhibitor of the Krebs cycle enzyme fumarase which
produces malic acid from fumaric acid.
Role of Malic acid supplements in
Fibromyalgia
Interestingly, it has been found that tartaric acid
and/or other yeast byproducts are also elevated in
urine samples of adults with the disorder
fibromyalgia, a debilitating disease associated with
muscle and joint pain, depress-ion, foggy thinking,
and chronic fatigue8.
A large percentage of patients with fibromyalgia
respond favorably to treatment with malic
acid which is present in health food supplements
such as Fibrocare and Supermalic. This is because
supplements of malic acid are able to overcome the
toxic effects of tartaric acid by supplying deficient
malic acid.
Treatment with the antifungal drug Nystatin
kills the yeast and values for tartaric acid steadily
diminish with antifungal treatment. Fifty percent
of patients with fibromyalgia often suffer from
hypoglycemia even though their diet may have
adequate or even excessive sugar8.
One of the reasons for the hypoglycemia may
be due to the inhibition of the Krebs cycle by tartaric
acid. The Krebs cycle is the main provider of raw
materials such as malic acid that can be converted
to blood sugar (Figure 2) by the process called
gluconeogenesis when the body uses up its glucose
supply.
Fig. 1 – Composition of Malic and Tartaric Acids Fig. 2 - The Krebs cycle demonstrates the conversions of raw
materials into Glucose, the main fuel for the brain.
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If sufficient malic acid cannot be produced, the
body cannot produce the sugar glucose, which is
the main fuel for the brain. The person with
hypoglycemia feels weak and their thinking is foggy
because there is insufficient fuel for their brain. Of
course, consumption of sugar may provide shortterm
relief but which also stimulates yeast
overgrowth and within a short time symptoms are
even worse.
Role of Arabinose in Autism, Alzheimer’s
Disease and Schizophrenia
Arabinose is a five carbon sugar with an
aldehyde function called an aldose, which is
frequently elevated in autism. In some children with
autism, arabinose concentrations may exceed 50
times the upper limit of normal.
The exact biochemical role of arabinose is
unknown, but a closely related yeast alcohol arabitol
has been used as a biochemical indicator of invasive
candidiasis. None of studies have found elevated
arabitol in any of the urine samples tested and
arabinose has not been found in the culture media
of multiple isolates of Candida albicans isolated
from stool samples of autistic children8.
It is assumed that arabitol produced by yeast
in the intestinal tract is absorbed into the portal
circulation and then converted to arabinose by the
liver. Hypoglycemia occurs in inborn errors of
fructose metabolism in which fructose inhibits
gluconeogenesis and it is possible that children with
autism might be deficient in one or more enzymes
involved in the metabolism of pentoses. Elevated
protein-bound arabinose has been found in the
serum glycoproteins of schizophrenics and in
children with conduct disorders and alteration of
protein function by arabinose is another mechanism
by which arabinose might effect biochemical
processes.
Women with vulvovaginitis due to Candida
have been found to have elevated arabinose in the
urine; restriction of dietary sugar brought about a
dramatic reduction in the incidence and severity of
the vulvovaginitis. Thus, one of the mechanisms of
action of antifungal drug therapy for autism might
be to reduce the concentration of an abnormal
carbohydrate produced by the yeast that can not be
tolerated by the child with defective pentose
metabolism. Arabinose tolerance tests should be
able to rapidly determine if such biochemical
defects are present in children with autism8.
Molecular basis of Pentosidines toxicity in
Autism and Alzheimer’s diseases: Protein
modification caused by pentosidine formation is
associated with crosslink formation), decreased
protein solubility, and increased protease resistance.
The characteristic pathological structures associated
with Alzheimer disease contain modifications
typical of pentosidine formation. Specifically,
antibodies against pentosidine immunocytochemically
label neurofibrillary tangles and senile
plaques in brain tissue from patients with Alzheimer
disease8.
In contrast, little or no staining with antipentosidine
antibodies is observed in apparently
healthy neurons of the same brain. The modification
of protein structure and function caused by
arabinose could account for the biochemical and
insolubility properties of the lesions of Alzheimer
disease through the formation of protein crosslinks.
Since the process of pentosidine formation is
an oxidative one, the use of antioxidants as well as
antifungal therapy appears to be a promising therapy
for Alzheimer’s disease. Glutathione has been
reported to inhibit pentosidine formation.
Supplementation with the vitamins biotin, pyridoxal
(B-6), and lipoic acid (whose function at protein
epsilon amino groups may be blocked by
pentosidines derived from arabinose) might also be
beneficial because of functional deficiencies due
to pentosidine formation8.
Not surprisingly, neurofibrillary tangles similar
to those found in the brains of Alzheimer’s victims
have also been reported in the brain of an autistic
person at autopsy. It has been reported that frequent
urinary tract infections and high amounts of
circulating immune complexes are associated with
more severe Alzheimer disease. The use of
antibiotics to treat urinary tract infections would
of course lead to yeast overgrowth of the
gastrointestinal tract.
Conclusion
Products of gastrointestinal microorganisms
including yeast that have been largely ignored in
the past appear to play major roles in human
metabolism, development, aging, and disease10.
Elevation of yeast metabolites such as tartaric
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acid and arabinose are found in many of the same
disorders and are even more common in autism,
SLE, Alzheimer’s disease, fibromyalgia, attention
deficit hyperactivity, and chronic fatigue syndrome.
The arabinose may interfere with gluconeogenesis
and also may through pentosidine formation
significantly alter protein structure, transport,
solubility, and enzymatic activity as well as
triggering autoimmune reactions to the modified
proteins.
The finding of pentosidine in the neurofibrillary
tangles of Alzheimer’s brains and its absence from
normal areas of the brain may indicate a direct role
of a yeast byproduct in accelerating the normal
aging process. Tartaric acid from yeast overgrowth
has a direct toxic effect on muscles and is an
inhibitor of a key Krebs cycle enzyme that supplies
raw materials for gluconeogenesis and offers an
explanation for many of the symptoms of
fibromyalgia.
Thus psychiatric disorders require not only the
antipsychotic treatment but also antifungal to treat
the organic cause behind such illness.
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http.www.yeast infection advisor.com.
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(8th ed.). Lippincott Williams and Wilkins.
6. Trowbridge JP Morton W. The yeast syndrome
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www.holistic help.net/candida.html
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