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People often link protein with muscle growth and repair, but its role goes much deeper. Your body needs it for muscle repair, immune function, digestion, and many other essential processes. So, your daily meals should include adequate protein from both animal and plant sources.
But this brings up common questions regarding dietary protein: Should you rely more on animal or plant-based protein? Are some sources easier to digest or more complete than others? And when, if ever, do you need protein supplements?
In this guide, explore the role of dietary protein in normal body functions, along with a comparison of plant and animal protein sources, to help you make informed choices.
Why Is Protein-Dense Food Crucial for Your Body?
Proteins are digested and broken down into amino acids that you need for muscle growth, hormone balance, digestion, and immune functioning. Of the 20 amino acids, your body cannot make nine, called essential amino acids, named as:
- Histidine
- Isoleucine
- Leucine
- Lysine
- Methionine
- Phenylalanine
- Threonine
- Tryptophan
- Valine
For these nine amino acids, you have to rely on protein-dense foods and supplements for muscle growth.
Role of Protein in Body Functions
From animal foods such as eggs, fish, poultry, milk, and yogurt to plant foods such as beans, lentils, quinoa, legumes, and wheat, once eaten, they support the following functions:
Digestive Functioning
Amino acids such as histidine and threonine support digestive functioning, where threonine participates in building mucus for the protection of the intestinal tract.
Immune Response
Getting protein with amino acids such as lysine, threonine, and histidine makes your body stronger against harmful radicals and germs by supporting immune responses.
Growth and Repair
One of the key roles of protein is to grow new muscle tissue and repair muscle tears or injuries by supporting the natural process called protein synthesis for rebuilding new cells. Alongside supporting growth hormones, amino acids like threonine work for skin rejuvenation and repair.
Mood Regulation and Sleep Quality
Protein foods are also helpful for emotional regulation by stimulating the neurotransmitter serotonin. Poultry, meat, dairy, and eggs can provide the amino acid tryptophan, which helps in the production of melatonin, supporting sleep and improving your sleep hygiene.
Understanding Plant vs. Animal-Based Dietary Proteins
You can get amino acids from both plant and animal sources, but they vary in the following ways:
- Complete vs. Incomplete Protein
Animal-sourced proteins offer all nine essential amino acids to help your body grow and repair itself. That is why they are called complete proteins. In plants, you also get essential amino acids, but not all nine, so they are called incomplete proteins. Some plant proteins are also complete amino acids, such as quinoa, hemp seeds, and soy. If you prefer plant-based foods for getting protein, try to combine more variety.
- Rate of Digestion
Animal-based proteins are easier to digest and absorb into the bloodstream compared to plant sources. Plant sources take longer to turn into amino acids because of their fibers and antinutrients. However, not all animal-sourced proteins are equal in terms of bioavailability or digestion.
For example, casein is derived from mammalian milk, and whey protein is obtained from cow’s milk. Both of these animal sources have various digestion rates, with whey being absorbed and broken down into amino acids much faster.
- Downsides
Both plant and animal proteins come with some downsides. In plants, you also consume antinutrients that can reduce nutrient absorption. Likewise, plants can contain heavy metals like mercury, lead, and cadmium absorbed from the soil, which can pose minor to severe risks in the long run.
Likewise, animal-based proteins such as red meat are high in saturated fats and pose risks to your heart. So you have to consume them in low to moderate quantities, even if they offer all amino acids.
When Should You Take Protein Supplements?
A well-balanced diet having all food groups is enough to meet your daily protein requirements of around 1 to 2 grams per kilogram. Just try to spread your intake evenly throughout the day for sustained energy and muscle support.
Consider protein shakes, powders, and other supplements in case:
- Your body is not absorbing enough nutrients, either with age or any medical condition.
- You engage in high-impact workouts or training sessions.
- You are following a restricted diet plan.
Bottom Line
Protein is essential for muscle growth and repair, immune function, digestion, and overall health. A protein deficiency can reduce your quality of life by contributing to lower immunity, weak hair, muscle loss, and reduced stamina. To meet your needs, include some protein-rich foods in each meal. You can also consider supplements with higher protein requirements. Remember, supplements cannot substitute for natural foods, so make healthy dietary habits your priority for adequate protein intake.
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