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What Are Proteins?
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The Science Behind It
Proteins are macromolecules composed of chains of amino acids, nine of which are essential and must come from the diet. They serve as structural components for muscles, organs, skin, hair, and connective tissue. Proteins are precursors for enzymes, hormones, neurotransmitters, and antibodies, and they play a role in fluid balance, acid-base regulation, and energy when carbs and fats are insufficient.
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The Easygoing Edition
Proteins are the body’s handy builders and repair crew. They patch up muscles, build your immune army, and even make chemical messengers (hormones) that tell your body what to do. Without enough protein, your body can’t rebuild, recover, or perform at its best.
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Types of Proteins
- Complete Proteins: Contain all essential amino acids. Sources: meat, eggs, dairy, soy, quinoa.
- Incomplete Proteins: Lack one or more essential amino acids. Sources: most legumes, nuts, seeds. Can be combined to form a complete profile.
- Specialized Proteins: Collagen for connective tissue, keratin for hair and nails, albumin for blood transport.
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Function in the Body
- Tissue repair and growth (muscle hypertrophy, wound healing)
- Enzyme and hormone synthesis
- Immune defense via antibody production
- Neurotransmitter precursors (tryptophan → serotonin; tyrosine → dopamine)
- Secondary energy source during fasting or low-carb intake
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Organ Connection
- Muscles: Growth, repair, and strength
- Skin, hair, nails: Structural support and repair
- Immune system: Antibodies and immune cells rely on amino acids
- Liver: Metabolizes amino acids and produces plasma proteins
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Healthy Sources
- Grass-fed meats, free-range poultry, wild-caught fish
- Eggs, yogurt, kefir, cheese
- Legumes: lentils, black beans, chickpeas
- Nuts and seeds: almonds, sunflower, hemp
- Plant-based complete proteins: quinoa, soy, tempeh
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Quick Tips
- Aim for ~20–30g protein per meal to optimize absorption and utilization
- Combine plant proteins for a complete amino acid profile
- Don’t forget collagen-rich foods for skin, joints, and connective tissue
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Myth
- Myth: “Too much protein damages the kidneys.”
- Truth: For healthy individuals, protein intake within recommended ranges is safe and supports growth, repair, and metabolism.