What to Eat for Better Muscle Growth and Maintenance
The right nutrition for your body can significantly support muscle growth and maintenance. We know that protein is critical for muscle health. High-quality protein sources are as important as the distribution of protein intake throughout the day, given your body can only utilize a certain amount at one time for muscle synthesis.
Animal products are excellent sources of complete proteins, meaning they contain all nine essential amino acids that our bodies cannot produce on their own. Lean meats like chicken, turkey, and lean cuts of beef or pork are high in protein and contain essential nutrients like iron and vitamin B12. Fish, especially oily fish like salmon, mackerel, and tuna, are not only high in protein but also rich in heart-healthy omega-3 fatty acids. Eggs are a very good source of high-quality protein, with the added advantage of being rich in vitamins and minerals. If you can tolerate dairy and lactose, milk, cheese, and yogurt are all good sources of protein. Some patients may benefit from choosing low-fat or non-fat versions to avoid excessive saturated fat.
For those following a vegan or vegetarian diet, there are plenty of plant-based sources of protein, as well. And while most plant proteins are not ‘complete,’ combining different plant proteins throughout the day can ensure you get all the essential amino acids. Legumes (beans, lentils, and peas) are high in both protein and fiber. They're also excellent sources of iron and potassium. Soybeans and soy products like tofu, tempeh, and edamame are some of the few plant-based sources of complete protein. They're also rich in fiber and micronutrients. Quinoa is also a complete protein, providing all nine essential amino acids. It's also high in fiber and various vitamins and minerals. Almonds, peanuts, chia seeds, flax seeds, and hemp seeds are high in protein and healthy fats. Foods like brown rice, oatmeal, and whole grain bread are not only sources of protein but also provide valuable fiber and complex carbohydrates. While vegetables generally don’t have a particularly high concentration of protein, some, like spinach, broccoli, and Brussels sprouts, do contain a decent amount.
Bear in mind that your protein needs can vary based on factors like age, sex, activity level, and health status. A balanced diet that includes a variety of different protein sources can help ensure you're getting all the amino acids and nutrients you need for optimal health, which your genetics helps to inform. Always consult a healthcare professional or dietitian for personalized advice.
What is ‘Sarcopenia’ and How to Prevent It
Sarcopenia is a condition characterized by the loss of muscle mass, strength, and function with age. As we age, our bodies naturally lose muscle mass and function, a process that can begin as early as our 30s. This is partly due to changes in muscle metabolism and a reduction in the body's ability to synthesize proteins efficiently.
A sedentary lifestyle accelerates muscle loss. Our muscles operate on a 'use it or lose it' principle. If we don't regularly challenge our muscles through physical activity, they lose their strength and mass over time. Hormones like testosterone, growth hormone, and insulin-like growth factor play a significant role in muscle growth and maintenance. With age, levels of these hormones decrease, contributing to muscle loss. Inadequate protein and calorie intake can contribute to muscle loss. As we age, our dietary needs change, and we may require more protein to maintain muscle mass. Chronic diseases can also lead to muscle loss, either directly or indirectly, by reducing appetite, increasing inflammation, or causing fatigue that limits physical activity.
While sarcopenia is a natural part of aging, there are steps you can take to slow its progression including regular resistance training, adequate protein intake, healthy lifestyle choices – like avoiding smoking, limiting alcohol consumption, and managing stress, which can cause hormonal imbalances – and regular medical visits to identify underlying conditions that contribute to muscle loss.
References:
Cavalcante, B.R., Falck, R.S. & Liu-Ambrose, T. “May the Force (and Size) Be with You”: Muscle Mass and Function Are Important Risk Factors for Cognitive Decline and Dementia. J Nutr Health Aging 27, 926–928 (2023). https://doi.org/10.1007/s12603-023-2023-9
"How can strength training build healthier bodies as we age?" National Institute on Aging, Research Highlights; June 30, 2022. https://www.nia.nih.gov/news/how-can-strength-training-build-healthier-bodies-we-age