The Gluten-Free Diet for Celiac Disease: Critical Insights to Better Understand Clinical Outcomes
Abstract
:1. Introduction
2. Celiac Disease Nutritional Status before Diagnosis
2.1. Nutritional Status
2.2. Anemia and Iron Deficiency
2.3. Bone Health
2.4. Other Micronutrient Deficiencies’ Consequences
3. Following a Gluten-Free Diet
3.1. Advantages and Nutritional Risks
- (1)
- Malnutrition, including over- and undernutrition, may be present in CeD, both at diagnosis and while under treatment. Underweight and growth retardation in children, which mostly reflect malabsorption, are not the rule. Nutritional deficiencies may be due to the poor absorption of amino acids and fats, as well as micronutrients, including calcium; iron; zinc; copper; vitamins A, D, E, and K; folate; and pyridoxine.
- (2)
- Malabsorption of calcium and vitamin D with a chronic inflammatory state affects bone health and may result in osteopenia or osteoporosis in CeD. Thus, it is recommended to measure calcium, alkaline phosphatase, and vitamin D at CeD diagnosis to assess bone health. Moreover, it is necessary to perform bone mineral density measurement with the dual X-ray absorptiometry (DEXA) scan in adults, not later than the age of 30–35 years, especially if there is a history of fractures and growth retardation in childhood. Surveillance of nutritional status during follow-up.
- (3)
- The nutritional composition of gluten-free rendered products (GFPs) can be unsatisfactory, and they are often not fortified with micronutrients. Therefore, the content of above-described vitamin and minerals in GFPs can be low, and these metabolic levels should be checked. In addition, eliminating gluten from the diet often impacts the proportion of nutrients consumed, leading to metabolic disorders. A critical point here is that GFPs are ultra-processed foods, which in the long term could be more detrimental to health. All this places the individual at risk for cardiovascular problems and metabolic-dysfunction-associated steatotic liver disease, the prevalence of which appears to be increased in this population when the gluten-free diet (GFD) has not been suitably advised.
- (4)
- A GFD should be balanced with proper iodine, iron, calcium, and vitamin D, among others, advised by a dietitian.
- (5)
- A GFD reduces or ameliorates some neurological symptoms, such as headache, ataxia, and epilepsy, in children and adults with CeD. In addition, a strict GFD can improve neuroimaging results in patients with gluten-sensitivity-related disorders.
3.2. Effects of the Gluten-Free Diet on Symptoms and Enteropathy
3.3. Adherence to GFD
4. Patient Follow-Up
4.1. Tools to Monitor Adherence to the Gluten-Free Diet: Techniques and Procedures
4.1.1. Periodic Visits by Expert Dietitians and Dietary Records
4.1.2. Structured Questionnaires
4.1.3. Clinical Follow-Up: Recording of Symptoms
4.1.4. Serology: CeD-Specific Antibodies
4.1.5. Gluten Immunogenic Peptides (GIP) in Urine and Feces
4.1.6. Intestinal Biopsy
4.2. Non-Responsive Celiac Disease
- The clinical condition responsible for the enteropathy is not true celiac disease and there has been a misdiagnosis In cases of doubt, re-evaluation of the biopsy specimen by one or two expert pathologists is necessary to exclude other causes of enteropathy including, small bowel bacterial overgrowth (SIBO), Whipples’s disease, Crohn’s disease, adult autoimmune enteropathy, common variable immunodeficiency, AIDS enteropathy, collagenous sprue, giardiasis, tuberculosis, or drugs (e.g., olmesartan), among others [1,3,4,10,15].
- Once the initial diagnosis of CeD has been confirmed, the first step in the investigation of patients with ongoing symptoms is assessing for exposure to gluten. Patients will tend to overestimate their adherence to a gluten-free diet (GFD). The patient unintentionally or deliberately eats gluten or is extremely sensitive to minimal amounts of gluten (super sensitivity to gluten). In fact, some patients required as little as 10 mg of gluten per day to induce the development of intestinal mucosal abnormalities [135,146]. On the other hand, the persistence of symptoms is a severe problem in the presence of seronegative villous atrophy, where the resolution of symptoms and enteropathy is a mandatory requirement for diagnosis. In this context, dietary transgressions are an essential bias in interpreting the clinical course of these patients [12,16,138].
- An associated pathology is the actual cause of the ongoing symptoms: microscopic colitis [147,148,149,150], SIBO [151,152,153,154], malabsorption of simple carbohydrates (e.g., lactose, fructose, or sorbitol) [155,156,157], and others such as reflux dysmotility [135], PEI [158,159], idiopathic bile salt malabsorption [160,161,162], Crohn’s disease, [163,164,165,166,167,168,169,170,171,172,173], and other functional digestive disorders, including irritable bowel syndrome [174,175,176]. In such patients, it is obvious that the nature of the symptoms is due to a different cause that overlaps with that of CeD itself. The active search for clinical conditions associated with CeD should be based on a judicious and cost-effective clinical assessment. For example, microscopic colitis must be ruled out if the dominant symptom is watery diarrhea in a woman who smokes cigarettes and takes regularly nonsteroidal anti-inflammatory drugs or omeprazole. Likewise, if the predominant symptom is flatulence and abdominal distension, or “explosive diarrhea” (mixed with abundant gas), it is a priority to rule out carbohydrate malabsorption, SIBO, or both. Finally, the GFD is often low in fiber, which may exacerbate constipation causing pain and bloating symptoms. Many patients with CeD will also fulfil the Rome IV criteria for irritable bowel syndrome (IBS) and in cases where other causes of symptoms have been excluded, this may be the most likely cause
- The patient developed RCD. Once other causes of ongoing symptoms have been ruled out, a diagnosis of true refractory celiac disease (RCD) can be considered. True RCD is a rare condition defined as persistent malabsorptive symptoms and villous atrophy despite strict adherence to a GFD with negative serology for anti-tissue transglutaminase or anti-endomysial antibodies; [135].
5. Psychological Considerations and Time-Related Variables
6. Cost-Efficacy of Optimal GFD Adherence Monitoring
- Increased education.
- Increased knowledge of a GFD.
- Increased intention/self-regulatory efficacy.
7. Follow-Up Algorithm in CeD
8. Gluten-Free Diet in CeD: Conclusions and Highlights
- In comparison with gluten-containing food, gluten-free alternative grains can render a lower amount of protein, dietary fiber and certain vitamins and minerals. Excessive consumption of ultra-processed foods such as many GFPs could have negative effects on health due to their inadequate nutritional composition (e.g., high sugar and saturated fat content).
- Following a GFD also entails significant challenges beyond avoiding gluten. It is also essential to correct nutritional deficits and achieve dietary balance. In addition, substituting manufactured GFPs with naturally gluten-free alternatives is essential to reduce the risk of metabolic disorders associated with high consumption of ultra-processed foods. In both cases, the role of a dietitian with specific training and expertise in this area is essential.
- Nutritional advice and counseling by an experienced dietitian can reduce the costs associated with long-term follow-up of the CeD patient. It should be noted that non-responsive CeD is a complex entity in which numerous causes may be involved (see Figure 2). Its investigation can be time-consuming, challenging, and cumbersome. In this regard, it should be borne in mind that inadequate adherence to the GFD remains the most frequent cause.
- Celiac patients report difficulties when eating out, constant worry about gluten, continuous planning, feeling different, emotional pressure, or coping with symptoms. Right after diagnosis, they feel anger, fear, shame, rage, and grief, but after some time in GFD, the situation normalizes, and their HRQoL improves. Psychological interventions are crucial in these scenarios.
- For all the above reasons, the short- and long-term follow-up of celiac patients should preferably be performed by a gastroenterology, hepatology, and nutrition unit with well-defined quality standards and the multidisciplinary involvement of physicians, nurses, dieticians, and psychologists (see Figure 3). This approach has been shown to reduce the costs associated with their health care.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Abbreviations
References
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Simón, E.; Molero-Luis, M.; Fueyo-Díaz, R.; Costas-Batlle, C.; Crespo-Escobar, P.; Montoro-Huguet, M.A. The Gluten-Free Diet for Celiac Disease: Critical Insights to Better Understand Clinical Outcomes. Nutrients 2023, 15, 4013. https://doi.org/10.3390/nu15184013
Simón E, Molero-Luis M, Fueyo-Díaz R, Costas-Batlle C, Crespo-Escobar P, Montoro-Huguet MA. The Gluten-Free Diet for Celiac Disease: Critical Insights to Better Understand Clinical Outcomes. Nutrients. 2023; 15(18):4013. https://doi.org/10.3390/nu15184013
Chicago/Turabian StyleSimón, Edurne, Marta Molero-Luis, Ricardo Fueyo-Díaz, Cristian Costas-Batlle, Paula Crespo-Escobar, and Miguel A. Montoro-Huguet. 2023. "The Gluten-Free Diet for Celiac Disease: Critical Insights to Better Understand Clinical Outcomes" Nutrients 15, no. 18: 4013. https://doi.org/10.3390/nu15184013
APA StyleSimón, E., Molero-Luis, M., Fueyo-Díaz, R., Costas-Batlle, C., Crespo-Escobar, P., & Montoro-Huguet, M. A. (2023). The Gluten-Free Diet for Celiac Disease: Critical Insights to Better Understand Clinical Outcomes. Nutrients, 15(18), 4013. https://doi.org/10.3390/nu15184013