Nursing study guide
Nutrition nursing
Connect intake, absorption, metabolism, illness, medications, function, culture, and access to the patient response.
Nursing filter
Assess the patient first, recognize time-sensitive change, prevent harm, and trend the response.
Connect systems
Symptoms, laboratory patterns, medications, nutrition, function, and psychosocial needs interact.
Safety boundary
Use current orders, facility policy, clinical supervision, and emergency pathways.
Nutrition assessment
Screen early, then investigate the cause
Body size alone does not establish nutrition status; malnutrition can occur at any weight.
| Assess | Look for | Nursing connection |
|---|---|---|
| History | Usual intake, appetite, restrictions, allergies, supplements, alcohol, food access, culture, chewing/swallowing, GI symptoms | Identify barriers and compare recent intake with needs and the treatment plan. |
| Trend | Unintentional weight change, intake/output, growth, strength, wounds, edema, muscle and fat loss | Use the same scale and context; edema can mask tissue loss. |
| Clinical data | Diagnosis, medications, hydration, glucose, electrolytes, kidney/liver function, CBC and selected micronutrients | No single laboratory value diagnoses malnutrition; interpret the whole pattern. |
| Escalation | Unsafe swallow, negligible intake, rapid loss, refeeding risk, severe GI losses, dehydration or metabolic instability | Protect the airway and request dietitian, speech-language, pharmacy or provider evaluation as indicated. |
Macronutrients + water
Food supplies energy, structure, protection, and fluid
Needs change with age, activity, pregnancy, illness, wounds, organ function, and treatment.
Carbohydrate
Primary readily available energy source. Fiber supports bowel function, satiety, and cardiometabolic health; carbohydrate amount and timing strongly affect glucose.
Protein
Supplies amino acids for muscle, enzymes, hormones, immune function, transport, and tissue repair. Needs may rise with wounds, burns, infection, cancer, or recovery but require individualization in organ disease.
Fat
Provides concentrated energy, essential fatty acids, cell-membrane components, insulation, and absorption of vitamins A, D, E, and K. Favor unsaturated sources when appropriate.
Water
Supports circulation, temperature regulation, transport, and waste removal. Needs must be individualized for losses, fever, heart/kidney disease, and ordered restrictions.
Vitamins + minerals
Deficiency and excess can both cause harm
Food sources are preferred when feasible; supplements require medication and disease review.
| Nutrient | Major roles | High-yield nursing notes |
|---|---|---|
| A | Vision, epithelial tissue, immunity and growth | Fat-soluble; excess can be toxic. Pregnancy requires particular caution with high-dose preformed vitamin A. |
| B vitamins | Energy metabolism, neurologic function and blood-cell formation | B1 risk rises with alcohol misuse/refeeding; B12 deficiency may cause anemia and neurologic change; folate is essential before and during early pregnancy. |
| C | Collagen formation, antioxidant activity and nonheme-iron absorption | Needed for wound healing; megadoses can cause adverse effects and interactions. |
| D + calcium | Bone mineralization, neuromuscular function and calcium balance | Assess intake, sunlight context, kidney function and prescribed therapy; excess supplementation can be harmful. |
| E + K | Antioxidant protection; clotting-protein activation | Fat-soluble. Vitamin K intake affects warfarin response; consistency matters more than avoidance. |
| Iron | Hemoglobin and oxygen transport | Confirm the cause of anemia before replacement; oral iron commonly changes stool color and may cause GI effects. |
| Sodium, potassium, magnesium, phosphate | Fluid, nerve, muscle, cardiac, energy and bone functions | Treat the patient and trend; kidney function, GI loss and medications can rapidly change levels. |
Food, medicine + disease interactions
Ask about food, beverages, herbs, supplements, and timing
Interaction tables are prompts to verify—not substitutes for the current prescription label, pharmacist, or facility reference.
| Example | Why it matters | Nursing action |
|---|---|---|
| Warfarin + vitamin K | Large changes in vitamin K intake can change anticoagulant response. | Teach a consistent intake pattern; monitor INR and bleeding/thrombosis symptoms as ordered. |
| Grapefruit + selected medicines | Grapefruit can alter intestinal drug metabolism and raise or lower exposure depending on the medicine. | Check the exact medicine label and interaction reference; do not generalize to every drug. |
| Levothyroxine + food/minerals | Food, calcium and iron can reduce or vary absorption. | Give consistently using the prescribed timing and separate interacting products as directed. |
| MAO inhibitors + high-tyramine foods | Tyramine can precipitate severe hypertension with nonselective MAO inhibition. | Verify the agent and teach the prescribed avoidance list and emergency symptoms. |
| Potassium + ACE inhibitor/ARB or potassium-sparing diuretic | Supplements and salt substitutes can worsen hyperkalemia. | Review kidney function, potassium trend, salt substitutes and OTC products. |
| Alcohol + insulin, sedatives, acetaminophen or metronidazole | Effects vary and may include hypoglycemia, CNS depression, liver injury risk, or an adverse reaction. | Screen without judgment and verify medicine-specific guidance; never assume one rule fits all. |
Therapeutic diets + safety
Match the diet to the problem and preserve dignity
Use the least restrictive plan that safely meets the clinical goal.
Texture + swallowing
Follow the ordered texture and liquid consistency exactly. Position, pacing, feeding assistance, oral care, and signs of aspiration are nursing responsibilities.
Allergy + intolerance
Prevent cross-contact for true allergy. Distinguish immune-mediated allergy from intolerance while taking every reported reaction seriously.
Sodium / fluid modification
May support heart, kidney, liver, or neurologic plans, but the target and fluid limit are individualized. Count hidden sources and all liquids when ordered.
Neutropenia / food safety
Use meticulous food safety and the institution or oncology-team plan; avoid universal restrictive “neutropenic diet” rules without an order.
NPO
NPO is a safety order, not a nutrition plan. Confirm the indication, allowed medicines/sips, duration, glucose/fluids, and restart plan.
Diabetes nutrition
Coordinate carbohydrate, medication, activity, and glucose
There is no single diabetes diet; plans should respect health goals, culture, access, and preferences.
Meal pattern
Emphasize nonstarchy vegetables, appropriate portions of quality carbohydrate, lean or plant protein, unsaturated fats, fiber, and less added sugar/highly processed food.
Medication timing
Coordinate meal delivery and intake with insulin or glucose-lowering medicines. If intake changes, assess glucose and follow the hypoglycemia and medication plan.
Sick-day risk
Vomiting, poor intake, dehydration, ketones, or persistent hyperglycemia requires the prescribed sick-day plan and escalation.
Cancer + cystic fibrosis
Protect intake when disease or treatment raises needs
Individual plans should be led by the treating team and dietitian.
| Condition | Common nutrition problem | Nursing priorities |
|---|---|---|
| Cancer | Poor appetite, taste change, nausea, mucositis, dry mouth, dysphagia, diarrhea/constipation, early satiety, malabsorption or cachexia | Screen repeatedly, manage symptoms, offer small calorie/protein-dense meals when appropriate, protect food safety, trend weight/function and refer early. |
| Cystic fibrosis | High energy expenditure and pancreatic malabsorption; needs vary with growth, lung disease and CF-related diabetes | Coordinate high-energy nutrition, pancreatic enzymes with all food as prescribed, fat-soluble vitamin therapy, salt/hydration plan and growth/weight trend. |
Renal, cardiac + GI needs
The diagnosis changes what “healthy” means
Avoid generic restrictions; use current laboratory trends, symptoms, treatment, and dietitian goals.
| Condition | Possible focus | Safety note |
|---|---|---|
| Kidney disease | Sodium, potassium, phosphate, protein, calories and fluid may need individual adjustment. | Needs differ by AKI/CKD stage, dialysis, urine output, wounds and labs; do not impose a blanket renal diet. |
| Heart failure / hypertension | Sodium pattern, fluid when ordered, adequate protein/energy, weight and symptom trend. | Differentiate fluid gain from tissue gain; teach label reading and when rapid weight change requires contact. |
| Celiac disease | Strict lifelong gluten avoidance after confirmed diagnosis and correction of deficiencies. | Prevent cross-contact; oats require appropriate sourcing; evaluate iron, folate, B12, vitamin D and bone health as indicated. |
| Liver / pancreatic / bowel disease | Energy, protein, fat, fiber, fluids, enzymes, vitamins or electrolytes may need disease-specific modification. | Encephalopathy, ascites, obstruction, pancreatitis, ostomy losses and malabsorption require different plans. |
Enteral + parenteral nutrition
Use the gut when it is safe and functional
Nutrition support is medication-like therapy requiring verification, monitoring, and complication prevention.
| Therapy | Core nursing care | Escalate |
|---|---|---|
| Enteral feeding | Verify patient/tube/order per policy, elevate and position as ordered, assess tolerance and aspiration risk, provide oral care, keep connections clean, flush and give medicines correctly. | Respiratory distress, suspected displacement, severe distention/pain, persistent vomiting, GI bleeding, tube obstruction or metabolic instability. |
| Parenteral nutrition | Use the prescribed central/peripheral access and aseptic technique; verify solution/rate, line compatibility, glucose, electrolytes, fluid balance, liver/metabolic trends and infection signs. | Do not abruptly stop high-dextrose therapy without the ordered contingency; escalate line infection, glucose crisis, electrolyte shift, overload or access complication. |
| Refeeding risk | Prolonged low intake can make renewed calories dangerous through rapid phosphate, potassium, magnesium, fluid and thiamine shifts. | Identify risk before feeding, follow the staged plan, monitor closely and report neurologic, cardiac, respiratory or fluid changes. |
Teaching, delegation + sources
Make the plan feasible, safe, and measurable
The RN assesses risk and response; the interdisciplinary team personalizes treatment.
Teach collaboratively
Use teach-back, preferred language, realistic food access, culture, budget, preparation ability, symptoms, goals, and written medication/food timing.
Delegate safely
Stable intake/output, weights, meal setup, feeding assistance, percentage eaten and routine observations may be assigned with exact precautions and report parameters.
RN retains
Assessment, swallow/aspiration judgment, interpretation, unstable feeding, tube/line complications, care-plan changes, education and evaluation.