Therapeutic diets

Diet items are picture memory plus disease matching. See the plate, then decide choose vs avoid for that condition. When the gut is bypassed or unsafe, the same chapter asks whether you protect the airway on a tube feed or escalate to TPN with glucose and line safety.

Match diet to disease

Name the disease first, then the diet goal, then the food. Skipping that order is how “healthy” choices become wrong answers: a banana looks nutritious until the kidneys cannot clear potassium, canned soup looks convenient until sodium loads a failing heart, and a plate of pasta looks filling until carbs or gluten are the actual problem.

Sodium restriction for HF and hypertension targets fluid retention and blood pressure, so the trap is processed salt, not fresh lean protein. Potassium restriction for CKD or hyperkalemia targets arrhythmia risk when excretion fails, so the same K-rich foods you push for hypokalemia flip to “limit.” Full potassium and sodium imbalance maps live in Electrolytes. Diabetes teaching is carb consistency and plate balance, not carb fear. Celiac is an immune response to gluten in wheat, barley, and rye. “Avoid bread” only works if the substitute is truly gluten-free and uncontaminated.

Low-sodium (cardiac)

Teach clients to picture fresh protein and produce. Salt hides in cans, cured meats, broths, soy sauce, and restaurant meals because sodium is a preservative and a flavor shortcut. Extra sodium pulls water into the vascular space; in heart failure that volume load worsens congestion and dyspnea. That is why the exam prefers the grilled chicken and broccoli plate over the “convenient” canned soup.

• Choose: fresh meats/fish, unsalted herbs/lemon, fresh or frozen veg without sauce, plain rice.
• Avoid / limit: canned soups, bacon/ham/deli, salted chips, pickles, soy sauce, most fast food.

Potassium-restricted (CKD / hyperK)

The same foods you encourage for hypokalemia are the ones to limit when potassium is high or kidneys cannot clear it. High extracellular potassium raises the risk of dangerous ventricular rhythms; low potassium does the same in the opposite direction. Food lists alone do not replace the ECG and lab picture in Electrolytes, but diet stems recycle this plate.

Diabetes: plate method

Clients need a workable plate, not a fear of every carbohydrate. Half non-starchy vegetables, one quarter lean protein, one quarter starch or grain, with carbs kept consistent meal to meal so insulin or oral agents can be timed. A starch-only plate spikes glucose; a “zero carb” myth leaves no fuel and invites hypoglycemia when insulin is already on board.

Gluten-free (celiac)

Gluten lives in wheat, barley, and rye. In celiac disease, gluten triggers an immune attack on the small-bowel mucosa, so even small amounts can keep malabsorption and diarrhea going. Safe patterns are plain proteins, rice, corn, fruits, vegetables, eggs, and dairy that is not contaminated with gluten additives.

• Unsafe defaults: wheat bread, regular pasta, many gravies/sauces, barley soups, malted drinks.
• Read labels for hidden wheat; cross-contact on shared toasters and fryers matters in real life and sometimes in stems.

Enteral feeding safety

Enteral nutrition uses the gut when the gut works but the client cannot eat enough safely by mouth. Tube feeds still put formula into a pathway that can spill into the lungs if the tube is misplaced or the client lies flat with a full stomach. Dysphagia screening and stroke aspiration setup live in Stroke and neuro assessment; this section owns the tube-feed safety checks the nutrition exam recycles.

Why residuals matter: formula sitting in a poorly emptying stomach has nowhere safe to go except up. Protocol residual thresholds vary by facility and by whether the tube is gastric or post-pyloric, so the exam tests the principle (assess tolerance, hold when ordered, report distress) more than a single milliliter number. Medication crush rules still apply: do not crush enteric-coated or extended-release tablets into a tube. Flush before and after meds as ordered so the tube stays patent.

• Mark and secure the tube; report a sudden change in external length before the next feed.
• Continuous vs bolus: both need airway protection; bolus often needs a longer post-feed upright window.
• Never start a feed when the client is deeply sedated without airway protection and a clear order for that plan.

When TPN is the pattern

Total parenteral nutrition (TPN) delivers calories, amino acids, lipids, and electrolytes by vein when the gut cannot be used safely or long enough: prolonged ileus, severe malabsorption, high-output fistula patterns, or other stems where enteral feeding is contraindicated. TPN is not a shortcut for a client who simply refuses hospital food.

Why you bridge with dextrose: the pancreas has been driving insulin against a continuous sugar infusion. Abrupt stop can drop blood glucose fast. Speeding the next bag to make up missed volume risks hyperglycemia and fluid overload. Line infection and air embolism pathways sit with IV safety in Medication safety and dosing; the nutrition ask is recognizing TPN as gut-bypass therapy with glucose continuity.

Vitamin deficiency cues and food-drug interactions

Some stems are not about a whole diet plate. They are about one nutrient colliding with a drug, or a deficiency that explains the client’s signs. Know the high-yield pairs rather than every biochemistry pathway.

Warfarin works by blocking vitamin K-dependent clotting factors. Sudden piles of leafy greens raise factor production and can drop INR; sudden abstinence can raise INR and bleeding risk. Consistency beats “never eat greens.” MAOI blockade lets tyramine dump catecholamines, so aged and fermented foods become a hypertensive crisis, not a cheese board treat. Deeper anemia care lives in Anemias; MAOI diet depth also appears in Antidepressants.

How to reason under time pressure

1. Name the disease → name the diet goal.
2. If the stem asks what to avoid, pick the processed or high-mineral offender.
3. If it asks what is safe, pick the plain fresh option that matches the plate you memorized.
4. If a drug is named, check for a classic food interaction before guessing a random plate.
5. If a tube or TPN is running: placement and HOB first for enteral; glucose bridge and line safety for TPN.