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    Memory/Learning: Eating to Learn: How Grains Impact on Our Ability to Focus, Comprehend, Remember, Predict, and Survive by Ron Hoggan


    Dr. Ron Hoggan, Ed.D.

    This article originally appeared in the Winter 2003 edition of Celiac.coms Scott-Free Newsletter.

    Evolution is an interactive process. Those of us who learn quickly and well are more likely to survive, thrive, and reproduce. Learning capacities then, are factors in the survival of our genes. Research is now revealing that cereal grains, along with other allergenic and highly glycemic foods, pose a serious threat to our sustained ability to learn. These foods have been shown to interfere at almost any stage of the learning process, impeding our attempts to focus our attention, observe, ponder, remember, understand, and apply that understanding. Grains can alter learning capacities in four specific ways: as sequelae of untreated celiac disease; through an immune sensitivity to gluten; through dietary displacement of other nutrients and; through the impact of grain on blood sugar/insulin levels.

    There are many reports of learning problems in association with untreated celiac disease. A majority of children with celiac disease display the signs and symptoms of attention deficit disorder (ADD/ADHD)1, 2 a range of learning difficulties3 and developmental delays4-6. Many of the same problems are found more frequently among those with gluten sensitivity7 a condition signaled by immune reactions against this most common element of the modern diet. Grain consumption can also cause specific nutrient deficiencies that are known to play an important role in learning. Grains can also cause problems with blood sugar/insulin levels resulting in reduced capacities for learning. Further, foods derived from grain are an important element in the current epidemic of hypoglycemia, obesity, and Type 2 diabetes8-10. Our growing understanding of the biological impact of cereal grain consumption must move educators to challenge current dietary trends.

    Part of our improved understanding comes from new testing protocols which are revealing that celiac sprue afflicts close to 1% of the general population, making it the most common life-long ailment among humans, with frequencies ranging from 0.5% to more than 5% of some populations11, 12. It is widespread and appears to occur more frequently among populations that have experienced relatively shorter periods of exposure to these grains13. The importance of this newly recognized high frequency of celiac disease becomes obvious when we examine the impact it has on learning and behavior.

    Research has identified ADHD in 66-70% of children with untreated celiac disease, which resolves on a gluten-free diet, and returns with a gluten challenge1, 2. Several investigators have connected particular patterns of reduced blood flow to specific parts of the brain in ADHD13-15. Other reports have connected untreated celiac disease with similarly abnormal blood flow patterns in the brain16. One might be able to dismiss such reports if viewed in isolation, but the increased rates of learning disabilities among celiac patients3, and the increased rates of celiac disease among those with learning disabilities leave little to the imagination17. Further, there is one report of gluten-induced aphasia (a condition characterized by the loss of speech ability) that resolved after diagnosis and institution of a gluten-free diet18. Still other investigations suggest a causal link between the partial digests of gluten (opioid peptides) and a variety of problems with learning, attention, and development.

    Gluten sensitivity, afflicting close to 15% of the general population19, 20 is an immune reaction to one or more proteins in found in grains. When a persons immune system has developed antibodies against any of these proteins, undigested and partly digested food particles have been allowed entry into the bloodstream21. The leakage of food proteins through the intestinal wall signals a failure of the protective, mucosal lining of the gastrointestinal tract, as is consistently found in untreated celiac disease. Many of the same health and learning problems that are found in celiac disease are significantly overrepresented among those with gluten sensitivity for the very good reason that many of the same proteins are being leaked into the blood of those with gluten sensitivity.

    Our cultural obeisance to grains is at odds with the remains of ancient humans. Archaeologists have long recognized that grains are a starvation food—one for which we are not well suited. Grains result in consistent signs of disease and malnourishment in every locale and epoch associated with human adoption of grain cultivation.

    Grains are a poverty food. As we increase our grain consumption, we cause deficiencies in other nutrients by overwhelming the absorptive and transport mechanisms at work in our intestines. For instance, diets dominated by grains have been shown to induce iron deficiency22—a condition that is widely recognized as causing learning disabilities23-29. This should not be surprising since iron is the carrier used to distribute oxygen throughout our bodies, including various regions of our brains. There is little room to dispute the hazards to learning posed by reductions in oxygen supply to the brain. Iron deficiency reduces available oxygen in the brain, revealing yet another dimension of gluten grains as mediators of learning difficulties.

    There is more. The impact of grain consumption on our blood sugar levels is yet another facet of its contribution to learning problems. We evolved as hunter-gatherers, eating meats, and complex carbohydrates in the form of fruits, vegetables, and seeds. Refined sugars were a rare treat wrested from bees with some difficulty. At best, it was a rare treat for our pre-historic ancestors.

    Today, with unprecedented agricultural/industrial production of refined sugars along with cultivation and milling of grain flours, these products have become very cheap and available, particularly over the last fifty years. During that time, we have added enormous quantities of grain-derived starches to the overwhelming quantities of sugar we consume. The result of this escalating dietary trend may be observed in the current epidemic rates of Type 2 diabetes, hypoglycemia, obesity, and cardiovascular disease. In the classroom, we see these trends manifest in students mood swings, behavioral disorders (fluctuating between extreme lethargy and hyperactivity), chronic depression, forgetfulness, and muddled thinking—all of which reflects the inordinate, counter-evolutionary burden placed on many homeostatic systems of the body, particularly those related to blood sugar regulation.

    The pancreas has many functions. One important activity of the pancreas is to stabilize blood sugar levels. When blood sugar is not well regulated, learning is impaired30. The pancreas secretes carefully monitored quantities of glucagon and insulin. The pancreas responds to the presence of proteins, sugar, and starch in the digestive tract by producing insulin. It produces glucagon in response to fats. The balanced presence of both of these hormones in the bloodstream is critical to learning because they regulate the transport of nutrients into cells. Too little or too much insulin can cause blood sugar levels go out of control inducing a wide range of symptoms.

    Today, when the insulin/glucagon balance goes awry, it is frequently due to insulin overproduction due to a diet dominated by sugars and starches. This overproduction is caused by chronic consumption of highly glycemic foods. The resulting elevated levels of insulin cause rapid movement of nutrients into cells, either for storage as fat, or to be burned as energy, causing increased activity levels, "hot spells", sweating, increased heart rate, etc. This energized stage requires a constant supply of sugars and starches to be maintained. Otherwise, it is soon followed by bouts of lethargy, light-headedness, tremors, and weakness, which are all signs of hypoglycemia or very low blood sugar levels.

    Despite having stored much of the blood sugars as fats, there is insufficient glucagon to facilitate its use for energy. As this condition progresses, and as blood sugar levels plummet, periods of irrational anger and/or confusion often result. These moods often result from adrenaline secreted to avoid a loss of consciousness due to low blood sugar levels. The next step in the progression, in the absence of appropriate nutritional intervention, is lapsing into a coma.

    In the short term, the answer to these fluctuations is more frequent consumption of sugars/starches. However, the long term result of such an approach is either a state of insulin resistance, where more and more insulin is required to do the same task, or a state of pancreatic insufficiency, where the pancreas is simply unable to keep pace with the demand for insulin. In either case, once this stage is reached, the individual may be diagnosed with type 2 diabetes. This disease has so increased among North Americans, particularly among children, that an autoimmune form of diabetes, previously called juvenile onset, had to be renamed to "Type 1 diabetes".

    By now, it will not surprise the reader to learn that Type 1 diabetes has also been shown to be significantly associated with gluten. Research reveals that there is considerable overlap between celiac disease and Type 1 diabetes. About 8% of celiacs also have Type 1 diabetes31-33, and 5-11% of Type 1 diabetics have celiac disease34-38. Further, Scott Frazer et al. have repeatedly shown, in animal studies, a causal, dose-dependent relationship between type 1 diabetes and gluten39-42.

    The growing reaction against gluten and other allergenic foods should not be confused with the several dietary fads of the 20th Century. The vegetarian perspective ignores the vitamin deficiencies that result from a strict vegetarian diet. The low-fat craze is another fad that has mesmerized the industrialized world for the last 30-40 years. Fortunately, this perspective has recently come under scrutiny. Despite having served as the driving force behind most physicians dietary recommendations during the last several decades, the low fat dictum is overwhelmingly being discredited by research reported in peer reviewed publications.

    Recognition and avoidance of allergenic and highly glycemic foods is a whole new trend that is based on scientific research and evidence. It reflects an improved understanding of the function of the gastrointestinal tract, the endocrine system, particularly the pancreas, and the immune system. Past dietary fads are consistently deficient in important nutrients that are necessary to our good health and survival. Further, they frequently contain substances that are harmful to us, such as the phytates that are abundantly present in whole grain foods, and interfere with absorption of many minerals.

    It is increasingly clear that grains, especially those that contain gluten, are contraindicated for human learning. The evidence is overwhelming. The mandate of eating to learn is learning to eat as our ancestors did.

    Ron Hoggan is an author, teacher and diagnosed celiac who lives in Canada. His book "Dangerous Grains" can be ordered here.

    References:

    1. Kozlowska, Z: (1991). Results of investigation on children with coeliakia treated many years with glutethen free diet Psychiatria Polska. 25(2),130-134.
    2. Paul, K., Todt, J., Eysold, R. (1985) [EEG Research Findings in Children with Celiac Disease According to Dietary Variations]. Zeitschrift der Klinische Medizin. 40, 707-709.
    3. Grech, P.L., Richards, J., McLaren, S., Winkelman, J.H. (2000) Psychological sequelae and quality of life in celiac disease. Journal of Pediatric Gastroenterology and Nutrition 31(3): S4
    4. Reichelt, K., Sagedal, E., Landmark, J., Sangvic, B., Eggen, O., Helge, S. (1990a). The Effect of Gluten-Free Diet on Urinary peptide Excretion and Clinical State in Schizophrenia. Journal of Orthomolecular Medicine. 5(4), 169-181.
    5. Reichelt, K., Ekrem, J., Scott, H. (1990b). Gluten, Milk Proteins and Autism: DIETARY INTERVENTION EFFECTS ON BEHAVIOR AND PEPTIDE SECRETION. Journal of Applied Nutrition. 42(1), 1-11.
    6. Reichelt, K., Knivsberg, A., Lind, G., Nodland, M. (1991). Probable etiology and Possible Treatment of Childhood Autism. Brain Dysfunction. 4, 308-319.
    7. Hoggan, R. (1997a). Absolutisms Hidden Message for Medical Scientism. Interchange. 28(2/3), 183-189.
    8. Caterson ID, Gill TP. Obesity: epidemiology and possible prevention. Best Pract Res Clin Endocrinol Metab. 2002 Dec;16(4):595-610.
    9. Hennessy AR, Walker JD.Silent hypoglycaemia at the diabetic clinic. Diabet Med. 2002 Mar;19(3):261.
    10. Kue Young T, Chateau D, Zhang M. Factor analysis of ethnic variation in the multiple metabolic (insulin resistance) syndrome in three Canadian populations.Am J Human Biol. 2002 Sep-Oct;14(5):649-58.
    11. Wahab PJ, Meijer JW, Dumitra D, Goerres MS, Mulder CJ. Coeliac disease: more than villous atrophy.Rom J Gastroenterol. 2002 Jun;11(2):121-7.
    12. Catassi C, Ratsch IM, Gandolfi L, Pratesi R, Fabiani E, El Asmar R, Frijia M, Bearzi I, Vizzoni L. Why is coeliac disease endemic in the people of the Sahara?Lancet. 1999 Aug 21;354(9179):647-8.
    13. Langleben DD, Acton PD, Austin G, Elman I, Krikorian G, Monterosso JR, Portnoy O, Ridlehuber HW, Strauss HW. Effects of Methylphenidate Discontinuation on Cerebral Blood Flow in Prepubescent Boys with Attention Deficit Hyperactivity Disorder.J Nucl Med. 2002 Dec;43(12):1624-1629.
    14. 2: Kim BN, Lee JS, Shin MS, Cho SC, Lee DS. Regional cerebral perfusion abnormalities in attention deficit/hyperactivity disorder Statistical parametric mapping analysis. Eur Arch Psychiatry Clin Neurosci. 2002 Oct;252(5):219-25.
    15. Lou, H., Henriksen, L., Bruhn, P. (1984). Focal cerebral hypoperfusion in children with dysphasia and/or attention deficit disorder. Archives of Neurology. 825-829.
    16. De Santis A, Addolorato G, Romito A, Caputo S, Giordano A, Gambassi G, Taranto C, Manna R, Gasbarrini G. Schizophrenic symptoms and SPECT abnormalities in a coeliac patient: regression after a gluten-free diet. J Intern Med. 1997 Nov;242(5):421-3.
    17. Knivsberg AM. Urine patterns, peptide levels and IgA/IgG antibodies to food proteins in children with dyslexia.Pediatr Rehabil. 1997 Jan-Mar;1(1):25-33.
    18. Case records of the Massachusetts General Hospital. Weekly clinicopathological exercises. Case 43-1988. A 52-year-old man with persistent watery diarrhea and aphasia.N Engl J Med. 1988 Oct 27;319(17):1139-48.
    19. Hadjivassiliou M, Boscolo S, Davies-Jones GA, Grunewald RA, Not T, Sanders DS, Simpson JE, Tongiorgi E, Williamson CA, Woodroofe NM. The humoral response in the pathogenesis of gluten ataxia. Neurology. 2002 Apr 23;58(8):1221-6.
    20. Hadjivassiliou M, Grunewald RA, Davies-Jones GA. Gluten sensitivity as a neurological illness.J Neurol Neurosurg Psychiatry. 2002 May;72(5):560-3. Review.
    21. Husby, V., Jensenius, C., Svehag, S.(1985). Passage of Undegraded DietaryAntigen into the Blood of Healthy Adults. Scandinavian Journal of Immunology. 22, 83-92.
    22. Ma A, Chen X, Zheng M, Wang Y, Xu R, Li J. Iron status and dietary intake of Chinese pregnant women with anemia in the third trimester. Asia Pac J Clin Nutr. 2002;11(3):171-5.
    23. Kapil U, Bhavna A. Adverse effects of poor micronutrient status during childhood and adolescence. Nutr Rev. 2002 May;60(5 Pt 2):S84-90. Review.
    24. Youdim MB, Yehuda S. The neurochemical basis of cognitive deficits induced by brain iron deficiency: involvement of dopamine-opiate system. Cell Mol Biol (Noisy-le-grand). 2000 May;46(3):491-500.
    25. Otero GA, Aguirre DM, Porcayo R, Fernandez T. Psychological and electroencephalographic study in school children with iron deficiency. Int J Neurosci. 1999 Aug;99(1-4):113-21.
    26. Guesry P. The role of nutrition in brain development.
    27. Prev Med. 1998 Mar-Apr;27(2):189-94. Review.
    28. Bruner AB, Joffe A, Duggan AK, Casella JF, Brandt J. Randomised study of cognitive effects of iron supplementation in non-anaemic iron-deficient adolescent girls. Lancet. 1996 Oct 12;348(9033):992-6.
    29. Soewondo S. The effect of iron deficiency and mental stimulation on Indonesian childrens cognitive performance and development. Kobe J Med Sci. 1995 Apr;41(1-2):1-17.
    30. McCarthy AM, Lindgren S, Mengeling MA, Tsalikian E, Engvall JC. Effects of diabetes on learning in children. Pediatrics. 2002 Jan;109(1):E9.
    31. Bertini M, Sbarbati A, Valletta E, Pinelli L, Tato L. Incomplete gastric metaplasia in children with insulin-dependent diabetes mellitus and celiac disease. An ultrastructural study.BMC Clin Pathol. 2001;1(1):2.
    32. Schuppan D, Hahn EG. Celiac disease and its link to type 1 diabetes mellitus.J Pediatr Endocrinol Metab. 2001;14 Suppl 1:597-605.
    33. Holmes GK. Coeliac disease and Type 1 diabetes mellitus - the case for screening.Diabet Med. 2001 Mar;18(3):169-77. x
    34. Saukkonen T, Vaisanen S, Akerblom HK, Savilahti E. Coeliac disease in children and adolescents with type 1 diabetes: a study of growth, glycaemic control, and experiences of families.Acta Paediatr. 2002;91(3):297-302.
    35. Spiekerkoetter U, Seissler J, Wendel U. General Screening for Celiac Disease is Advisable in Children with Type 1 Diabetes.Horm Metab Res. 2002 Apr;34(4):192-5.
    36. Barera G, Bonfanti R, Viscardi M, Bazzigaluppi E, Calori G, Meschi F, Bianchi C, Chiumello G. Occurrence of celiac disease after onset of type 1 diabetes: a 6-year prospective longitudinal study.Pediatrics. 2002 May;109(5):833-8.
    37. Hansen D, Bennedbaek FN, Hansen LK, Hoier-Madsen M, Hegedu LS, Jacobsen BB, Husby S. High prevalence of coeliac disease in Danish children with type I diabetes mellitus.Acta Paediatr. 2001 Nov;90(11):1238-43.
    38. Aktay AN, Lee PC, Kumar V, Parton E, Wyatt DT, Werlin SL. The prevalence and clinical characteristics of celiac disease in juvenile diabetes in Wisconsin.J Pediatr Gastroenterol Nutr. 2001 Oct;33(4):462-5.
    39. MacFarlane AJ, Burghardt KM, Kelly J, Simell T, Simell O, Altosaar I, Scott FW. A type 1 diabetes-related protein from wheat (triticum aestivum): cDNA clone of a wheat storage globulin, Glb1, linked to islet damage.J Biol Chem. 2002 Oct 29.
    40. Scott FW, Rowsell P, Wang GS, Burghardt K, Kolb H, Flohe S. Oral exposure to diabetes-promoting food or immunomodulators in neonates alters gut cytokines and diabetes.Diabetes. 2002 Jan;51(1):73-8.
    41. Scott FW, Cloutier HE, Kleemann R, Woerz-Pagenstert U, Rowsell P, Modler HW, Kolb H. Potential mechanisms by which certain foods promote or inhibit the development of spontaneous diabetes in BB rats: dose, timing, early effect on islet area, and switch in infiltrate from Th1 to Th2 cells.Diabetes. 1997 Apr;46(4):589-98.
    42. Scott FW. Food-induced type 1 diabetes in the BB rat.Diabetes Metab Rev. 1996 Dec;12(4):341-59.
    • Of Relevant interest:
      Gormanous M, Hunt A, Pope J, Gerald B. Lack of knowledge of diabetes among Arkansas public elementary teachers: implications for dietitians. J Am Diet Assoc. 2002 Aug;102(8):1136-8.

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    Guest Barbara

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    Would be excellent except references are not numbered as per footnotes, so difficult to ascribe journals to article statements.

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  • About Me

    As co-author of "Dangerous Grains" and "Cereal Killers", the study of the impact of gluten continues to be a driving passion in my life. I am fascinated by the way that gluten induces illness and impedes learning while it alters mood, behavior, and a host of other facets of our existence. Sure, the impact of gluten on health is an important issue, but that is only the most obvious area of impact. Mood disturbances, learning disabilities, and the loss of quality of life due to psychiatric and neurological illness are even more tragic than the plethora of physical ailments that are caused or worsened by gluten. The further I go down this rabbit hole, the more I realize that grains are a good food for ruminants - not people. I am a retired school teacher. Over the last decade, I have done some college and university level teaching, but the bulk of my teaching career was spent working with high school students. My Web page is: www.DangerousGrains.com

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    Dr. Ron Hoggan, Ed.D.
    Hippies Weren't the Only Ones Tripping in the Sixties
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    Several reports of very small numbers of schizophrenic patients, chronic patients, which Dohan had specifically identified as unlikely to respond to the diet, showed no benefit from a gluten-free diet.  Other studies were improved through double-blinding but weakened by extremely limited dietary control, permitting visitors to bring food to patients participating in that study, essentially abrogating the value of the entire study.  Some researchers ignored Dohan’s assertions that celiac disease could serve as a model for studying schizophrenia.  They chose, instead, to produce data that discredited the possibility that schizophrenia is identical to celiac disease by showing that most schizophrenic patients do not show signs of malabsorption.  Other work, conducted in the same vein, showed that celiac antibodies are not found in most schizophrenic patients. 
    Despite all the powerful evidence compiled by Dohan and others, this wave of studies and letters discredited Dohan’s work by contradicting notions that Dohan had never voiced.  For instance, he never expressed the notion that schizophrenia was celiac disease.  He simply asserted that there were compelling similarities and a small but significant overlap between schizophrenia and celiac disease, suggesting the need to explore gluten as a possible contributing factor in schizophrenia.  Considerable data support that notion but Dohan’s vigorous and persistent pursuit of this important discovery was soon depicted as a personal quest.  For instance, in a private email with one of Dohan’s contemporaries, Dohan was repeatedly called “unscientific.” Yet, fifteen years later, this same researcher has since participated in a published study that supports Dohan’s hypothesis. 
    Fortunately for all of us, the last dozen years have seen a resurgence of interest in the gluten hypothesis regarding schizophrenia, beginning with a case report by De Santis et al.  They described a patient with schizophrenia and a SPECT scan showing abnormal blood flow patterns in the brain typical of schizophrenia.  This patient developed symptoms of celiac disease and was placed on a gluten free diet.  Not only did this patient’s celiac symptoms disappear, her/his symptoms of schizophrenia disappeared and blood flow patterns in her brain normalized.  The gluten-free diet was the only plausible explanation for these changes.  
    A list of reports suggest important reasons to investigate the impact of gluten on our brains.  For instance, Dr. Knivsburg reported the discovery of two cases of celiac disease and one of milk protein sensitivity among 15 dyslexic children.  That is a huge increased incidence over the general population.  Similarly, Dr. Kozlowska found that almost 70% of celiac children have ADHD that normalizes on a gluten-free diet.  The Massachusetts General Hospital case study mentioned earlier reported celiac-associated aphasia that resolved on a gluten free diet.  Dr. Hu and colleagues report a laundry list of cognitive impairments in association with celiac disease including amnesia, acalculia, confusion, and personality changes.  Many of these disabilities wax and wane according to the gluten content of the diet. 
    However, the notion of gluten-driven cognitive deficits, including learning disabilities, and behavioral abnormalities in association with non-celiac gluten sensitivity, has only recently gotten some research attention.  For instance, Alexandra Blair of The TimesOnline in the United Kingdom reported on an informal study conducted at a small school for dyslexic children in Northumberland.  They got some startlingly positive improvements in students’ performance after placing them on a gluten free diet.  Dr. Marios Hadjivassiliou et al.  at the Royal Hallamshire Hospital in Sheffield, U.K.  have repeatedly reported that a majority of patients with neurological disease of unknown origin are also gluten sensitive while only about one third of these patients have celiac disease. 
    Kalaydjian et al.  reviewed the medical literature to about 2005 and called for large, controlled studies of the connection between gluten and schizophrenia because it is clear that some schizophrenic patients benefit enormously from a gluten free diet.  Similarly, earlier this year, Kraft et al.  reported on a schizophrenic patient who was diagnosed at seventeen years of age.  Fifty three years later, at her doctor’s suggestion, she undertook a ketogenic diet to lose weight.  Not only did she lose weight, she also lost all signs and symptoms of schizophrenia. 
    As 2009 comes to a close, two more publications have made this year into something of a turning point for this research.  Cascella et al.  state that “Our results confirm the existence of a subgroup of patients with antibody characteristics associated with the presence of a specific immune response to gluten.”
    Similarly, Samaroo et al.  report that their findings “….  indicate that the anti-gliadin immune response in schizophrenia has a different antigenic specificity from that in celiac disease…” they go on to assert that the genetic HLA markers for celiac disease were not found in the schizophrenic patients they studied. 
    At the most basic level, we know that gluten causes increased intestinal permeability among a wide range of genetically susceptible individuals.  We also know that substances from moldy grains will cause schizophrenic symptoms in any of us.  It is not a great leap to suggest that, in the context of gluten-induced increased intestinal permeability, similarities in hallucinations, altered brain perfusion, and a range of cognitive deficits found in schizophrenia, celiac disease, and gluten sensitivity might all be rooted in the commonest food in our diets from which hallucinogenic drugs can be produced. 
    Institutional nutrition and food programs for the needy and/or homeless include large proportions of inexpensive gluten-laden foods.  Such diets, often provided charitably for those at the lowest socio-economic strata, are at least self-defeating.  Further, such foods are often consumed at this economic level despite visible molds growing on them.  I have heard stories of homeless persons scavenging through dumpsters located at or near bakeries.  There can be little doubt that such eating practices perpetuate the very psychiatric conditions that have reduced many of these people to a state of homelessness.
     

    Jefferson Adams
    Celiac.com 02/13/2013 - A team of researchers wanted to determine whether levels of immunoglobulin G (IgG) were associated with a later diagnosis of a non-affective psychotic disorder.
    The researchers included H. Karlsson, Å. Blomström, S. Wicks, S. Yang, R.H. Yolken, and C. Dalman. They are affiliated with the Department of Neuroscience at the Karolinska Institute in Stockholm, Sweden.
    To accomplish their goal, the team analyzed archival dried blood spots taken from newborns in Sweden between 1975 and 1985 with verified register-based diagnoses of non-affective psychoses made between 1987 and 2003 and comparison subjects matched on sex, date of birth, birth hospital, and municipality.
    The team reviewed samples from a total of 211 case subjects and 553 comparison subjects who agreed to take part in the study. They pulled data for factors associated with maternal status, pregnancy, and delivery from the Swedish Medical Birth Register.
    They used enzyme-linked immunosorbent assay to analyze the results for levels of IgG directed at gliadin (a component of gluten) and casein (a milk protein) in eluates from dried blood spots. They then calculated odds ratios for levels of IgG directed at gliadin or casein for non-affective psychosis.
    Comparison subjects associated with non-affective psychosis showed levels of anti-gliadin IgG (but not anti-casein IgG) above the 90th percentile of levels observed (odds ratio=1.7, 95% CI=1.1-2.8).
    This connections was not affected by differences in maternal age, immigrant status, or mode of delivery. They also found that gestational age at birth, ponderal index, and birth weight were not associated with maternal levels of anti-gliadin IgG.
    From their study, they concluded that high levels of anti-gliadin IgG in the maternal circulation are associated with an elevated risk for the development of a non-affective psychosis in offspring.
    They point out that more research is needed to identify the mechanisms underlying this association in order to develop preventive strategies.
    Source:
    Am J Psychiatry. 2012 Jun;169(6):625-32. doi: 10.1176/appi.ajp.2012.11081197.

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