Research Article Creative Commons, CC-BY
*Corresponding author: Ewa Filip, Department of Molecular Biology and Cytology, The Institute for Research on Biodiversity, Faculty of Biology, University of Szczecin, Szczecin, Poland.
Received: July 18, 2019; Published: July 29, 2019
My opinion is issued to collect and broaden the information about gluten, or more precisely, whether its presence and properties should raise concerns. Knowledge about gluten has expanded considerably over the last dozen or so years. It is known that it is a large polymer consisting of a mixture of proteins. Gluten occurs in popular cereals such as wheat, spelt, barley, rye and oat. Works carried out by cereal breeding institutes require a continuous control of the presence of various forms of these proteins in wheat grain, because, firstly, there is a need to obtain fertile varieties with high grain quality parameters, and secondly, to improve the physical and chemical properties of farinaceous products. As it turned out, gluten, which brings many positive aspects in the breeding process of cereals, as well as in the production of bakery products, can become a cause of many problems for humans. According to many authors, apart from celiac disease, there are already over 50 other diseases, such as osteoporosis, autoimmune diseases, cancer and neurological diseases that are being associated with gluten effects.
Gluten is a polymer composed of a mixture of at least 50 proteins . There are about 20% of proteins in the endosperm of mature cereal grains such as wheat, rye, barley, triticale and oat, of which 80% are gluten proteins [2,3]. The biological role of gluten is to supply elements (carbon, nitrogen and sulfur) to germinating seeds . The composition of gluten proteins in grains affects the technological quality of common wheat. The quantity and composition of gluten proteins such as gliadins and glutenins is responsible for flour baking quality in the bakery industry. These proteins constitute the “skeleton” of a kneaded dough and are responsible for physicochemical properties of gluten. Gluten in cakes is primarily responsible for flexibility and cohesion [2,3]. As it turned out, gluten that brings so much positive properties in the production process of bakery products may be the cause of many health problems.
Gluten consumed by humans most often in the form of bread and pasta is a high-calorie food. This caloric value together with the increase of glucose and insulin in the body contributes to the formation and deposition of visceral fat, most often in the regions of the abdomen, thighs and buttocks as well as diabetic complications and diseases .
The biochemical effect of visceral fat on the body carries a number of adverse changes. Among other things, it leads to an increase in low density lipoprotein (LDL cholesterol) responsible for the accumulation of atherosclerotic plaque, hypertension, heart diseases [6-9]. In the nervous system, it is responsible for the occurrence of temporal epilepsy , dementia , ataxia, neuropathy, gluten encephalopathy , worsening of autistic indices  and aggravation of schizophrenia . In the digestive system, apart from intolerance, allergy and celiac disease, gluten  is the cause of increased hepatic enzyme secretion, may lead to liver inflammation, primary biliary cirrhosis and colitis and Crohn’s disease . Skin symptoms of the negative effect of gluten are primarily herpetic dermatitis (Duhring’s disease) , acne , paraneoplastic syndrome, erythema nodosum, psoriasis, dermatomyositis and exacerbation of the genetic ichtiosis vulgaris (ichthyosis) . It was also shown that gluten affects hair loss . The influence of gluten in the female reproductive system may contribute to infertility, increased risk of low birth weight of a newborn, premature labor or habitual miscarriage  and increased prolactin production . In addition, women suffering from celiac disease are predisposed to a shorter fertility period, caused by the later age of menstruation and a faster menopause . In the case of men, gluten proteins may lead to erectile dysfunction and gynecomastia , caused by disturbances of estrogen production by visceral fat .
Gluten proteins contained in the endosperm of cereals also contribute to tumor formation in the human body. They may be a factor contributing to the formation of breast, prostate, lung and gastrointestinal cancers, especially gastrointestinal tumors, colon cancer and pancreatic cancer [29,30].
People with autoimmune gluten intolerance may have other co-existing autoimmune diseases such as type 1 diabetes, hyperthyroidism, vitiligo, primary biliary cirrhosis, rheumatoid arthritis , iron deficiency anemia, osteopenia and osteoporosis, hyposplenism or IgA nephropathy .
Despite the many negative effects of gluten consumption, its introduction to the infant diet does not cause adverse effects in their psychomotor development . Gliadin, on the other hand, contributes to the enhanced action of the human immune system through the influence on monocytes and their cytokine production .
The review of many scientific publications has expanded our knowledge on this subject (Table 1), and not only medical knowledge, but also of agricultural genetics, which in the last 50 years has transformed traditional wheat into a hybrid productprofitable, robust and efficient, but little related to the original. One should remember that biological and genetic modifications of wheat were introduced with good intentions. At the turn of the 1960s, there was a fear of world overcrowding and hunger in in the West. It was decided to increase cereal cultivations; the US and other highly developed countries began to invest huge amounts in research aimed at improving plants and increasing yields. Breeding programs existing to this day, based on wheat genetics and biotechnology, have achieved success, and currently we have highly fertile wheat with good grain quality parameters (group A, B). A wide breeding program taking into account all directions, based on global gene resources, provides annually new, better forms of common wheat.
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