Synopsis

Source of validity: Scientific
Rating (out of 5): 4

Protein intake plays an important role in maintaining overall cardiovascular health, though its use is not typically targeted at "heart weakness" in a direct, clinical sense. Scientific evidence suggests that adequate dietary protein is essential for the maintenance and repair of body tissues, including cardiac muscle. In patients with heart failure (a clinical syndrome sometimes referred to historically as "weak heart"), muscle wasting (sarcopenia) and malnutrition are common complications, and insufficient protein intake can exacerbate these issues. Clinical guidelines often recommend ensuring sufficient protein intake (generally 1.1–1.5 g/kg body weight per day) in patients with heart failure to preserve muscle mass, strength, and functional capacity.

Multiple studies have shown that protein supplementation can help improve outcomes in frail or malnourished heart failure patients by supporting muscle synthesis and improving exercise tolerance. However, the benefit is more related to the prevention of muscle wasting and cachexia rather than directly strengthening the heart muscle itself. Importantly, the type and amount of protein, as well as kidney function, should be considered in heart failure patients. There is no strong evidence to suggest that very high protein diets provide additional benefit to heart function and, in some circumstances, may be contraindicated.

In summary, scientific evidence supports the use of adequate protein intake as part of comprehensive nutritional management in patients with heart failure to help prevent muscle wasting and support functional status.

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