What Is Protein? Benefits, Daily Requirements, and the Best High-Protein Foods

Protein is one of the most important nutrients for overall health, yet many people don't get enough of it. Whether your goal is to support healthy aging, maintain muscle, manage your weight, or simply feel your best, protein plays a key role in nearly every function of the body.

In this blogpost, we'll explore why protein matters, how much you need each day, and some of the best protein-rich foods to include in your diet.

What Is Protein?

Protein is a macronutrient made up of amino acids, often called the "building blocks" of life. Your body uses protein to build and repair tissues, create enzymes and hormones, support immune function, and maintain healthy muscles, skin, hair, and nails.

Unlike some nutrients that can be stored for later use, your body constantly needs a steady supply of protein from food to maintain its daily biological functions.

Why Is Protein Important?

Supports Muscle Maintenance and Growth

Protein helps build and repair muscle tissue. According to clinical research published in the Journal of Applied Physiology (Paddon-Jones & Rasmussen, 2009), ensuring adequate dietary protein is crucial as we age, as muscle mass and physical strength naturally decline over time.

Helps You Feel Full Longer

Protein is highly satiating. A landmark study published in Cell Metabolism (Batterham et al., 2006) demonstrated that high-protein diets trigger the release of gut hormones like PYY, which increases satiety and significantly reduces hunger signals. This makes protein a powerful nutrient for healthy weight management.

Supports Healthy Aging

Getting enough protein helps preserve strength, mobility, and physical independence in older adults (McKendry et al., 2020).

Essential for Skin, Hair, and Nails

Structural proteins like collagen and keratin provide the foundational building blocks for healthy skin, nails, and hair. Clinical research demonstrates that collagen supplementation significantly improves skin elasticity and hydration (de Miranda et al., 2021), while also promoting faster nail growth and reducing brittle nails (Hexsel et al., 2017).

Supports Immune Function

Antibodies—the specialized immune proteins that help your body recognize and fight off infections—are synthesized from amino acids supplied through dietary protein (Schroeder & Cavacini, 2010).

How Much Protein Do You Need Per Day?

The baseline Recommended Dietary Allowance (RDA) for healthy adults set by medical authorities is 0.8 grams of protein per kilogram (kg) of body weight per day (Wu, 2016).

Daily baseline targets based on weight:

• 60 kg (132 lbs): 48 grams of protein
• 70 kg (154 lbs): 56 grams of protein
• 80 kg (176 lbs): 64 grams of protein
• 90 kg (198 lbs): 72 grams of protein

However, extensive nutrition research suggests that active adults, older individuals, and people aiming to preserve lean muscle mass during weight loss benefit from a higher intake of 1.2–1.6 grams of protein per kilogram of body weight per day.

For a 70 kg (154 lb) person, that equals approximately 84–112 grams of protein daily.

Best High-Protein Foods

Here are some excellent protein-rich foods and their approximate protein content per serving.

Animal-Based Protein Sources

Food	Serving Size	Protein
Chicken breast	100 g	31 g
Turkey breast	100 g	29 g
Lean beef	100 g	26 g
Salmon	100 g	22 g
Tuna	100 g	25 g
Eggs	2 large	12 g
Greek yogurt	200 g	20 g
Cottage cheese	200 g	24 g
Milk	1 cup (240 ml)	8 g

Plant-Based Protein Sources

Food	Serving Size	Protein
Lentils	1 cup cooked	18 g
Chickpeas	1 cup cooked	15 g
Black beans	1 cup cooked	15 g
Edamame	1 cup cooked	18 g
Tofu	100 g	12 g
Tempeh	100 g	20 g
Quinoa	1 cup cooked	8 g
Hemp seeds	3 tbsp	10 g
Chia seeds	2 tbsp	5 g

Nuts and Seeds

Food	Serving Size	Protein
Almonds	30 g	6 g
Pumpkin seeds	30 g	8 g
Peanuts	30 g	7 g
Peanut butter	2 tbsp	8 g

Tips for Getting More Protein

• Spread it out: Include a quality source of protein with every meal rather than consuming it all at dinner.
• Power up breakfast: Start your day with eggs, Greek yogurt, or a protein-rich smoothie.
• Smart swaps: Choose Greek yogurt or cottage cheese over low-protein dairy options.
• Enhance meals: Add beans, lentils, edamame, or hemp seeds to soups, bowls, and salads.
• Keep high-protein snacks handy: Keep boiled eggs, nuts, or pumpkin seeds close by for convenient snacking.
  
  

Frequently Asked Questions About Protein (FAQ)

What is the minimum recommended daily protein intake?

The minimum Recommended Dietary Allowance (RDA) is 0.8 grams per kilogram of body weight for sedentary adults. However, optimal intake for active individuals and healthy aging is often higher, ranging from 1.2 to 1.6 g/kg.

Can eating protein help with weight loss?

Yes. Protein stimulates satiety hormones (such as GLP-1 and PYY) and takes more energy for your body to digest compared to carbs or fats (thermic effect of food), making it easier to manage calorie intake and reduce cravings.

Are plant proteins as effective as animal proteins?

Yes, provided you eat a diverse variety of plant foods. While some plant sources are lower in specific essential amino acids, combining foods like legumes, grains, seeds, and soy products ensures you receive all essential amino acids.

Final Thoughts

Protein is essential for building and maintaining muscle, supporting healthy aging, balancing appetite, and keeping your body functioning optimally. While individual needs vary based on age and activity level, most adults benefit from prioritizing protein-dense foods throughout the day.