Sarcopenia
Protein intake and physical activity are important stimuli for muscle protein synthesis. A number of expert groups have proposed an increase in dietary protein recommendations for older age groups to 1.0-1.2 g/kg body weight per day.
Key nutrient supplementation in older adults is of interest in the prevention of sarcopenia and frailty, since it is a simple, low-cost treatment approach without major side effects.
Vegetarian and vegan dog diet
A good source of protein provides a dog with a balanced and complete profile of amino acids, and is essential for growth, muscle maintenance, and various cellular functions. Conventionally, these amino acids are primarily provided through either a singular or a combination of animal meats, meals, and by-products. A vegan diet provides the same amino acids through plants such as legumes, peas, beans, nuts, seeds and grains. While all plants contain some amount of protein, some plant sources contain more than others. However, plant sources generally do not have as complete an amino acid profile, as they are often limiting in one or more essential amino acids.  Good sources of plant protein include chickpeas, green peas, soybeans, potatoes, rice, lentils, beans, and quinoa. In dog food, the protein composition can be sourced from a variety of ingredients, including grains, rice, corn, wheat, and/or barley. Soybeans, one of the most common plant-based protein sources in dog foods, provide a concentrated and complete protein source, meaning that they provide all the essential amino acids in adequate amounts. If soy is excluded for hypoallergenic purposes, chickpeas, green peas, rice, and potatoes are also common ingredients in commercial vegan dog foods. Nutritional yeast is another good source of complete protein, and can also be added to complement the amino acid profile.