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Zinc deficiency impairs wound healing, causes loss of taste (hypogeusia), hair loss, and weakened immunity. Iron deficiency leads to anemia, copper deficiency can impair iron metabolism, and magnesium deficiency causes neuromuscular symptoms. DTRs should recognize at-risk populations (patients on long-term parenteral nutrition, those with GI disorders) and recommend zinc-rich foods such as meat, shellfish, legumes, and nuts. This reflects the Nutrition Science domain.

Rickets is a bone-softening disease in children caused by vitamin D deficiency, leading to bowed legs, delayed growth, and skeletal deformities. Vitamin D is required for calcium and phosphorus absorption and bone mineralization. Vitamin A deficiency causes night blindness, vitamin K deficiency impairs clotting, and vitamin B12 deficiency causes megaloblastic anemia. DTRs must recognize symptoms of rickets and emphasize fortified milk, fatty fish, and sunlight exposure as preventive strategies. This belongs to the Nutrition Science domain, where nutrient–disease relationships are essential.

The PDCA cycle ends with Act, which involves implementing successful changes permanently or revising the plan based on results. The steps are:

•Plan: Identify the problem and develop strategies.

•Do: Implement changes on a small scale.

•Check: Evaluate outcomes and collect data.

•Act: Standardize improvements or make further adjustments.

DTRs support PDCA by collecting trayline accuracy data, participating in staff training, or monitoring patient satisfaction. This belongs to the Management domain, highlighting continuous quality improvement.

Heme iron, found in animal sources like meat, poultry, and fish, is absorbed more efficiently (15–35%) than non-heme iron in plant foods (2–20%). Chicken liver is one of the richest heme iron sources. Spinach, beans, and fortified cereal provide non-heme iron, which requires vitamin C for better absorption. DTRs should counsel patients with iron deficiency to include heme sources when possible or pair plant-based iron with vitamin C–rich foods. This reflects the Nutrition Science domain by connecting nutrient bioavailability with dietary planning.

Irradiation uses controlled doses of ionizing radiation to kill pathogens, insects, and spoilage organisms without significantly raising food temperature. Pasteurization uses heat, freezing slows microbial growth, and drying reduces water activity. Irradiated foods are safe, nutritionally stable, and labeled with the “Radura” symbol. DTRs should understand this technology to address questions in foodservice or community nutrition. This is part of the Food Science domain.