Amino acids are the building blocks of protein. Your body uses them to maintain muscle and other tissues, produce enzymes and hormones, support immune function, and carry out many everyday cellular processes. Although the body can make some amino acids, nine essential amino acids must come from food.
Nearly every protein-containing food supplies amino acids, but the amounts and proportions differ. Choosing a variety of protein sources makes it easier to meet both total protein needs and essential amino acid needs.
What makes a food high in amino acids?
A food may be considered a high-quality protein source when it provides a substantial amount of protein and a broad range of essential amino acids. Animal foods such as eggs, dairy, fish, meat, and poultry generally provide all nine essential amino acids. These are often called complete proteins.
Many plant foods contain all nine essential amino acids as well, but one or more may be present in smaller amounts. Soy, quinoa, and buckwheat are notable plant-based options. Other plant proteins can still contribute significantly to a balanced diet when you eat a varied selection of legumes, grains, nuts, seeds, and vegetables.
Animal foods rich in essential amino acids
- Eggs: Eggs provide complete protein and can be used in breakfasts, salads, sandwiches, and main meals.
- Fish and seafood: Salmon, tuna, and other fish supply complete protein. Fatty fish also provide omega-3 fats.
- Poultry and lean meat: Chicken, turkey, and beef are concentrated sources of protein and essential amino acids.
- Dairy foods: Milk, yogurt, cottage cheese, and cheese provide complete protein. Greek yogurt and cottage cheese can be convenient choices for snacks or breakfasts.
- Whey protein: Whey is a concentrated dairy protein that can be added to smoothies or other foods when a convenient protein option is useful.
Portion size, preparation method, and the overall nutritional value of a food still matter. For example, choosing a minimally processed protein source more often can add useful nutrients while helping limit excess sodium or saturated fat.
Plant-based foods that supply amino acids
Soy foods
Tofu, tempeh, edamame, and soy milk are versatile sources of complete plant protein. They can be used in stir-fries, salads, soups, sandwiches, and smoothies.
Legumes
Lentils, chickpeas, black beans, kidney beans, and peas provide protein along with fiber and other nutrients. Legumes are especially useful as a base for soups, grain bowls, stews, and spreads.
Grains and pseudograins
Quinoa and buckwheat provide a broad range of amino acids. Oats, brown rice, whole-wheat pasta, and other whole grains also contribute protein, particularly when paired with legumes or seeds.
Nuts and seeds
Peanuts, almonds, pumpkin seeds, chia seeds, hemp seeds, and sesame seeds add protein to meals and snacks. They are nutrient-dense, so portions may be smaller than portions of foods that are primarily protein.
How to combine plant proteins
Some plant proteins are relatively lower in particular essential amino acids. Legumes and grains complement one another because they tend to provide different amino acid patterns. Examples include:
- Beans with brown rice or whole-grain tortillas
- Lentil soup with whole-grain bread
- Chickpeas with quinoa
- Peanut butter with whole-grain toast
- Tofu with brown rice and vegetables
These foods do not necessarily need to be eaten in the same bite or meal. Eating a varied diet throughout the day is a practical way to obtain a balanced mix of essential amino acids.
Simple high-protein meal ideas
- Breakfast: Eggs with whole-grain toast, or Greek yogurt topped with oats, fruit, and seeds.
- Lunch: A quinoa and black bean bowl with roasted vegetables and a yogurt-based dressing.
- Dinner: Salmon with lentils and greens, or tofu stir-fried with vegetables and brown rice.
- Snack: Cottage cheese, edamame, a glass of milk, or hummus with vegetables and whole-grain crackers.
- Convenient option: A whey or soy protein shake when preparing a complete meal is difficult.
Building a balanced amino acid intake
Protein quality is only one part of a healthy eating pattern. Include a range of protein foods and distribute them across meals rather than relying on a single source. Whole foods such as legumes, fish, eggs, dairy, nuts, seeds, and whole grains also provide nutrients that isolated protein products may not contain.
People following vegan diets can meet essential amino acid needs through varied food choices, including legumes, soy foods, grains, nuts, and seeds. Those with food allergies, kidney disease, digestive conditions, or other medical concerns should seek individualized advice before substantially changing protein intake or using amino acid supplements.
For most people, a varied menu built around nutrient-dense protein foods is a straightforward way to obtain the amino acids needed for normal body function, muscle maintenance, and tissue repair.
