Cardiac Diet

The client recovering from an MI asks why their hospital tray has no salt packets and includes oatmeal instead of eggs — your explanation connects diet directly to survival.

A cardiac diet targets the modifiable risk factors for coronary artery disease, heart failure, and hypertension through three pillars: sodium restriction, fat modification, and fiber promotion. Sodium is typically limited to less than 2,000 mg/day (some guidelines specify 1,500 mg/day for heart failure). This reduces fluid retention, lowers blood pressure, and decreases cardiac workload. Saturated fat is limited to less than 6% of total calories (per AHA guidance; some broader guidelines use <10%), and trans fats are eliminated to slow atherosclerotic plaque progression. The diet emphasizes unsaturated fats (olive oil, fatty fish rich in omega-3s), whole grains, fruits, vegetables, and lean proteins — aligning closely with the DASH diet and Mediterranean patterns. Soluble fiber (oats, beans, apples) actively lowers LDL cholesterol. Fluid restriction is not a default component of a cardiac diet but is added when the client has heart failure (typically 1,500–2,000 mL/day). Teaching priorities include reading nutrition labels for hidden sodium, avoiding processed and canned foods, using herbs and lemon juice instead of salt, and understanding that "low-fat" packaged foods often compensate with added sodium or sugar.

Key Distinctions

Don't confuse cardiac sodium limits (<2,000 mg/day) with renal diet potassium and phosphorus restrictions — cardiac diets actually encourage potassium-rich foods like bananas and oranges unless renal function is impaired. Students mix up fluid restriction (a heart failure add-on) with the baseline cardiac diet — not every cardiac client is fluid-restricted. "Low-cholesterol" is not the same as "low-fat"; the focus has shifted to limiting saturated and trans fats specifically, not total dietary cholesterol.

Clinical Pearl

Think DASH, not just slash: Don't just cut sodium — Add fruits, vegetables, and omega-3s. Swap, don't just stop.