Evidence supporting the use of: Animal protein
For the health condition: Weight Gain

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Synopsis

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

Animal protein is scientifically validated as supportive for weight gain, particularly in individuals who are underweight, have increased metabolic needs, or are attempting to build muscle mass. Animal proteins, found in foods such as meat, eggs, and dairy, are considered complete proteins because they contain all essential amino acids in optimal proportions for human health. Numerous studies have shown that higher protein intake, especially from animal sources, can promote increases in muscle mass when combined with resistance training. This is largely due to the high bioavailability of animal protein and its rich content of leucine, an amino acid critical for muscle protein synthesis. Furthermore, animal protein is energy-dense and provides additional nutrients (such as iron, zinc, and vitamin B12) that support overall health and metabolism. Clinical guidelines for malnutrition and cachexia (weight loss due to illness) often recommend increasing protein intake, including animal sources, to help restore healthy body weight. However, while animal protein is effective for weight gain when consumed in caloric surplus, it is not inherently "fattening" and will not cause weight gain unless total caloric intake exceeds expenditure. Overall, the use of unspecified animal protein for weight gain is well-supported by scientific evidence, particularly in the context of muscle mass accrual and nutritional rehabilitation.

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