What is a Complete Protein?
In Part 1, I discussed why getting more protein is more important as you age. But I wanted to figure out what a protein is, beyond just a number on a nutrition label.
A complete protein, sometimes called a whole protein, is a food source that contains all nine essential amino acids in adequate proportions. Each amino serves a purpose for our health and the only way to get them is through diet. Our bodies can’t produce these.
Here are a few Complete Proteins with Amount Per Serving.
Animal-Based Sources
- Eggs
- 1 large egg: 6 grams
- 1 egg white: 3.6 grams
- Chicken
- 3 oz (85g) cooked chicken breast: 26 grams
- Turkey
- 3 oz (85g) cooked turkey breast: 25 grams
- Fish
- Salmon: 3 oz (85g) cooked: 22 grams
- Tuna: 3 oz (85g) canned in water: 20 grams
- Cod: 3 oz (85g) cooked: 19 grams
- Beef
- 3 oz (85g) cooked lean beef: 22 grams
- Pork
- 3 oz (85g) cooked lean pork chop: 22 grams
- Dairy Products
- Milk: 1 cup (240ml): 8 grams
- Greek yogurt: 6 oz (170g): 17 grams
- Cottage cheese: 1/2 cup (113g): 14 grams
- Cheddar cheese: 1 oz (28g): 7 grams
Plant-Based Sources
- Quinoa
- 1 cup (185g) cooked: 8 grams
- Soy Products
- Tofu: 1/2 cup (126g) firm: 10 grams
- Tempeh: 1/2 cup (83g): 15 grams
- Edamame: 1/2 cup (78g) cooked: 8 grams
- Chia Seeds
- 1 oz (28g): 4 grams
- Hemp Seeds
- 3 tablespoons (30g): 10 grams
- Buckwheat
- 1 cup (168g) cooked: 6 grams
- Amaranth
- 1 cup (246g) cooked: 9 grams
- Spirulina
- 1 tablespoon (7g): 4 grams
Note: Protein content can vary slightly depending on the specific product or preparation method. These values are approximate and based on average nutritional data.
The Importance of Complete Proteins
Complete protein is important. Without it, your body will struggle to do the following.
- Optimal Body Function: Each essential amino acid plays a vital role in maintaining your body’s health and function.
- Muscle Building and Repair: Complete proteins provide all the necessary building blocks for muscle growth and repair.
- Enzyme and Hormone Production: Many enzymes and hormones require specific amino acids for their synthesis.
- Immune System Support: Several amino acids are crucial for maintaining a strong immune system.
- Energy Production: Some amino acids can be converted to glucose for energy when needed.
What Happens If You Don’t Get Complete Proteins?
Not getting enough means you’re more likely to be tired, weak, and probably sick more often. Here is a complete list of what happens when you don’t get your proteins.
- Protein Deficiency:
- Weakened immune system, increasing susceptibility to infections
- Slower wound healing
- Loss of muscle mass (muscle wasting)
- Fatigue and weakness
- Impaired Growth and Development:
- Particularly crucial for children, pregnant women, and athletes
- Can lead to stunted growth in children
- Compromised Organ Function:
- The heart, liver, and other organs may not function optimally
- Can lead to fluid retention (edema) in severe cases
- Hormonal Imbalances:
- Disrupted production of enzymes and hormones
- Can affect mood, sleep patterns, and metabolic processes
- Nutrient Malabsorption:
- Some amino acids are necessary for the absorption of other nutrients
- Can lead to secondary nutrient deficiencies
- Decreased Cognitive Function:
- Some amino acids are crucial for neurotransmitter production
- May affect memory, focus, and overall brain health
- Compromised Bone Health:
- Amino acids like lysine are crucial for calcium absorption
- Long-term deficiency may contribute to decreased bone density
- Slower Recovery from Exercise:
- Inadequate protein intake can hinder muscle repair and growth
- May lead to increased risk of injury and longer recovery times
- Hair, Skin, and Nail Problems:
- Proteins are essential for the health of these tissues
- Deficiency can lead to brittle nails, hair loss, and skin issues
Protein deficiency is rare in developed countries. There is some protein in nearly everything. One of our sons is a vegetarian and we work hard to ensure his diet is still balanced. There are plenty of athletes and bodybuilders who never touch meat. It’s easier than ever to get the protein in from other sources and food combinations.
What I’ve learned is you can get the nine amino acids when you combine two foods creating a nutritional equivalent to animal-based proteins.
Creating Complete Proteins: Food Combination Guide
Here are some food combination list that creates complete proteins:
- Rice + Beans
- Whole Wheat Bread + Peanut Butter
- Corn + Beans
- Hummus + Whole Wheat Pita
- Lentils + Rice
- Whole Grain Pasta + Peas
- Oatmeal + Almonds
- Ezekiel Bread (made from sprouted grains and legumes)
- Spinach Salad + Pumpkin Seeds
- Pita + Hummus
- Black Beans + Quinoa
- Whole Grain Tortilla + Refried Beans
- Barley + Lentil Soup
- Peanut Butter + Whole Grain Toast
- Brown Rice + Lentils
- Whole Wheat Pasta + Bean Sauce
- Tahini + Whole Wheat Bread
- Chickpea Curry + Brown Rice
- Tofu Stir-Fry + Brown Rice
- Vegetable Soup + Whole Grain Crackers
- Sunflower Seed Butter + Whole Grain Bread
- Bean Burrito in Whole Wheat Tortilla
- Whole Grain Cereal + Soy Milk
- Quinoa Salad with Black Beans and Corn
- Lentil Loaf + Whole Grain Side Dish
- Edamame + Brown Rice
- Split Pea Soup + Whole Grain Roll
- Falafel in Whole Wheat Pita
- Peanut Sauce over Whole Grain Noodles
- Baked Potato + Bean Chili Topping
This is not all the list just some of the more popular here in the states.
Back to the These are the Amino Acids and what they do.
The Nine Essential Amino Acids and Their Functions
- Histidine:
- Supports growth and tissue repair
- Helps produce histamine, crucial for immune response and digestion
- Isoleucine:
- Involved in muscle metabolism
- Crucial for hemoglobin production and energy regulation
- Leucine:
- Key for protein synthesis and muscle repair
- Helps regulate blood sugar levels
- Promotes wound healing
- Lysine:
- Essential for calcium absorption
- Supports collagen production
- Important for enzyme and antibody production
- Methionine:
- Aids in detoxification
- Important for metabolism and tissue growth
- Helps with the absorption of selenium and zinc
- Phenylalanine:
- Precursor to tyrosine, dopamine, epinephrine, and norepinephrine
- Crucial for brain function
- Threonine:
- Supports cardiovascular, liver, central nervous, and immune system function
- Important component of structural proteins and enzymes
- Tryptophan:
- Precursor to serotonin, a neurotransmitter regulating mood, sleep, and appetite
- Helps in the production of niacin (Vitamin B3)
- Valine:
- Stimulates muscle growth and regeneration
- Involved in energy production
By ensuring your diet includes complete proteins or appropriate combinations of incomplete proteins, you provide your body with all these essential amino acids, supporting overall health, muscle maintenance, and various bodily functions.