Impact of Increased Protein Density Diet to Muscle Mass and Strength Among Mid-aged and Older Adults

Compared to usual group of 15% protein in meals, intervention group will receive 25% protein contents under same estimated calorie menus. Protein may come from either egg, meat, fish, soy, or milk product.

Designed as comparator , compared to empirical arm of 25% protein in meals, intervention group will receive 15% protein contents under same estimated calorie menus. Protein may come from either egg, meat, fish, soy, or milk product.