Newly Diagnosed Celiac Disease with Iron Deficiency
A 34-year-old woman is referred after a diagnosis of celiac disease confirmed by duodenal biopsy and positive tissue transglutaminase IgA. She reports 6 months of diarrhea, bloating, fatigue, and a 7 kg weight loss (current weight 52 kg, height 165 cm). Labs: hemoglobin 9.8 g/dL, ferritin 6 ng/mL, folate 3.1 ng/mL, vitamin D 18 ng/mL, calcium 8.4 mg/dL. She follows a lacto-ovo vegetarian diet and works night shifts as a nurse. She asks whether she should start a gluten-free diet immediately and whether she needs iron infusions.
1. Prioritize her nutrition diagnoses and explain how you would sequence the gluten-free diet education with her micronutrient repletion.
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Priority nutrition problems: (1) inadequate oral intake and malabsorption related to untreated celiac disease, evidenced by weight loss and diarrhea; (2) iron-deficiency anemia; (3) folate and vitamin D deficiencies with low calcium; (4) risk of further micronutrient deficiencies (B12, zinc) on a restricted diet.
Sequencing: Begin a strict gluten-free diet now - it is the primary treatment and will reduce mucosal inflammation and improve absorption. However, do not delay repletion of deficiencies. Iron: with ferritin 6 and hemoglobin 9.8, oral iron may be poorly absorbed while the mucosa is inflamed, and she may not tolerate it; discuss intravenous iron with the physician, especially given malabsorption. Folate and vitamin D can be replaced orally. Calcium intake should be assessed and supplemented if dietary intake is low.
Coordinate with the gastroenterologist and a dietitian skilled in celiac care. Provide written gluten-free guidance, cross-contamination advice, and label-reading skills. Recheck labs in 8–12 weeks and monitor weight and symptom resolution.
2. She is vegetarian and works nights. What specific counseling points address her risk of inadequate protein and B12 intake on a gluten-free vegetarian diet?
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Gluten-free vegetarian diets can be low in protein and B12 because many plant proteins (seitan, barley, rye) are excluded and animal products may be limited. Counseling points:
Protein: emphasize gluten-free plant proteins - legumes, lentils, tofu, tempeh, quinoa, amaranth, buckwheat, nuts, seeds, and gluten-free dairy/eggs. Aim for roughly 1.0–1.2 g/kg (about 52–62 g/day) spread across meals. Provide a sample day.
B12: with a lacto-ovo diet, eggs and dairy are sources; if intake is low or labs are low, recommend a supplement (e.g., 25–100 mcg/day or periodic injections per physician). Night-shift work can disrupt meal timing; help her plan portable gluten-free meals and snacks and set consistent eating times around her shift. Address caffeine and alcohol, which can impair iron absorption. Reinforce reading labels for gluten and for fortified foods, and schedule follow-up.
3. She asks whether her night-shift schedule affects her iron absorption and whether timing of supplements matters. What do you advise?
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Timing matters more than shift work per se. Advise taking oral iron on an empty stomach with vitamin C (e.g., citrus or a supplement) to enhance absorption, and separating it from tea, coffee, calcium, and antacids by at least 1–2 hours, since these inhibit absorption. If oral iron causes GI upset, alternate-day dosing may improve tolerance and absorption.
Night-shift work mainly affects meal regularity and caffeine intake. Help her plan iron-rich meals (legumes, fortified cereals, eggs) at consistent times and limit coffee/tea around supplements. Because her ferritin is very low and she has malabsorption, discuss IV iron with the physician rather than relying on oral iron alone. Recheck ferritin and hemoglobin after 8–12 weeks and adjust.