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Protein is a nutrient made of amino acids that your body uses to build and repair muscle and other tissues, make enzymes and hormones, and support immune function. You get it from both animal and plant foods, and the amount varies widely by food. This explainer covers what protein does, how to tell complete from incomplete sources, which foods provide it, and how to compare protein content so you can meet your needs.

What Protein Does in the Body

Protein is not a single substance but a family of molecules built from chains of amino acids. Your body breaks dietary protein into amino acids and reassembles them into the proteins it needs. Its main roles include:

• Structure and repair — muscle, skin, bone, and organ tissue
• Enzymes — proteins that drive chemical reactions, including digestion
• Hormones — some hormones, such as insulin, are proteins
• Immunity — antibodies are proteins that help defend against pathogens
• Transport and storage — proteins carry substances through the blood and store nutrients

Because your body does not store amino acids the way it stores fat, you need a regular supply from food.

Essential Amino Acids: Complete vs Incomplete Protein

Your body can make many amino acids, but nine are essential — you must get them from food. This distinction drives the common "complete vs incomplete" framing:

Incomplete sources are not inferior — they simply need pairing. Eating complementary plant proteins across the day (for example, beans with rice, or peanut butter with whole-grain bread) supplies the full set of essential amino acids. You do not need to combine them in the same meal; the overall daily pattern is what matters.

Foods High in Protein

Amounts below are approximate and vary by cut, variety, and preparation. Use them as a starting point, then check specific values in a nutrition database or label.

Animal sources

• Chicken breast — roughly 30 g per 100 g cooked
• Lean beef — roughly 26 g per 100 g cooked
• Salmon — roughly 25 g per 100 g cooked
• Eggs — about 6 g per large egg
• Greek yogurt — roughly 10 g per 100 g
• Milk — about 8 g per cup

Plant sources

• Soybeans / tofu / tempeh — roughly 15–17 g per 100 g (soy is a complete protein)
• Lentils — roughly 9 g per 100 g cooked
• Chickpeas and most beans — roughly 7–9 g per 100 g cooked
• Quinoa — about 4 g per 100 g cooked
• Nuts and seeds — roughly 5–7 g per 30 g (almonds, peanuts, pumpkin seeds)
• Peanut butter — about 7 g per 2 tablespoons

Plant foods also deliver fiber and micronutrients, so combining categories is a practical way to hit protein targets without relying on a single source.

How to Read a Label and Compare Protein

To compare protein across foods, use the same two numbers every time:

1. Grams of protein per serving — found on the Nutrition Facts panel.
2. Serving size — because "per serving" is meaningless without it.

A food with 12 g protein per 30 g serving is more protein-dense than one with 12 g per 100 g. When comparing packaged foods, check that serving sizes are similar, or convert both to protein per 100 g for a fair comparison.

For whole foods without labels — meat, fish, produce, grains — use a nutrition database to look up values. Tools like MyFoodData let you log foods and view comparisons of everything you log, and its recipe calculator lets you tab the ingredients and view the amino acid profile of a recipe. That is useful when you want to check whether a plant-based combination covers all essential amino acids rather than just counting total grams.

Practical Daily Intake and Tips

General guidance for healthy adults is roughly 0.8 g of protein per kilogram of body weight per day, though needs rise with activity level, pregnancy, and age. For a 70 kg adult, that is about 56 g per day. Athletes and older adults often need more; individual needs vary, so treat this as a baseline rather than a prescription.

Tips for meeting your needs:

• Anchor each meal with a protein source — eggs at breakfast, beans or meat at lunch and dinner.
• Combine plant proteins across the day rather than worrying about each meal.
• Use a tracker to see your actual intake instead of estimating. Logging a few typical days reveals patterns quickly.
• Check amino acid profiles for plant-heavy diets, not just total grams, to confirm you are covering the essentials.

If you have a health condition that affects protein needs, such as kidney disease, follow guidance from your clinician rather than general targets.

Vitamins are organic compounds your body needs in small amounts to function, and it cannot make most of them on its own—so they have to come from food. The main exceptions are vitamin D, which your skin synthesizes in response to sunlight, and vitamin K, which gut bacteria produce in limited amounts. If you eat a varied diet, you likely cover most of your needs; if you're tracking what you eat, a food log can show where the gaps are. This guide covers what each vitamin does, where to find it, and who tends to fall short.

Vitamins vs. minerals vs. macronutrients

These three categories are often lumped together, but they work differently:

• Macronutrients — carbohydrates, protein, and fat. You need them in large amounts for energy and structure.
• Vitamins — organic compounds (they contain carbon) needed in small amounts. They mostly act as coenzymes, helping chemical reactions happen.
• Minerals — inorganic elements like calcium, iron, and zinc. They don't contain carbon and play structural and regulatory roles.

The key practical difference: vitamins are fragile. Heat, light, air, and water can destroy them during cooking and storage, which is why cooking method affects how much you actually get.

The essential vitamins and what they do

There are 13 essential vitamins. Here's what each one does and where to find it.

The B vitamins work as a team; a shortfall in one often signals a shortfall in others, since they cluster in similar foods.

Fat-soluble vs. water-soluble: why it matters

This distinction affects how you absorb, store, and lose each vitamin.

Fat-soluble (A, D, E, K): Absorbed with dietary fat, stored in your liver and fatty tissue, and not easily excreted. You don't need them daily—your body draws on reserves. But because they accumulate, very high doses from supplements can reach toxic levels.

Water-soluble (C and all B vitamins): Dissolved in water, not stored in meaningful amounts, and excreted in urine. You need them more regularly. They're also more easily lost during cooking—boiling vegetables leaches B vitamins and C into the water, so steaming or stir-frying preserves more.

A practical takeaway: eat fat-soluble vitamins with some fat. A spinach salad with olive oil absorbs more vitamin K and A than plain spinach.

Who tends to fall short

Deficiency is uncommon in people eating a varied diet, but certain groups are at higher risk:

• Vegans and strict vegetarians — vitamin B12, since it occurs naturally only in animal products. Fortified foods or supplements are typically needed.
• Older adults — reduced stomach acid impairs B12 absorption, and skin makes less vitamin D with age.
• People with limited sun exposure — vitamin D, especially in winter at higher latitudes or with covered skin.
• Pregnant people — increased need for folate, which is why folic acid is recommended before and during early pregnancy.
• People with malabsorption conditions — celiac disease, Crohn's disease, or after bariatric surgery, where fat-soluble vitamins are poorly absorbed.
• Heavy alcohol use — depletes several B vitamins, particularly thiamine and folate.

Signs of deficiency vary by vitamin: fatigue and pale skin (B12, iron), bleeding gums (C), bone pain (D), night blindness (A), and easy bruising (K) are common examples. These symptoms overlap with many other conditions, so a diagnosis needs a clinician, not self-assessment.

How to check whether your diet covers them

The most reliable way to know if you're meeting your needs is to track intake against reference values. A food log that breaks out individual micronutrients—rather than just calories and macros—shows which vitamins you're consistently under on.

MyFoodData, for example, tracks 30+ nutrients and offers free micronutrient breakdowns, with verified badges marking foods that have the most complete data. Its comparison tools let you see how different foods stack up side by side, which is useful when you're trying to close a specific gap—say, swapping a low-folate grain for a higher one. The site also notes that its core tracking, recipes, and barcode scanning are free, with a Premium tier that removes ads and adds features like unlimited photo scanning and profile sharing.

To use any tracker well:

1. Log a few typical days, not your best days—you want an honest baseline.
2. Check the micronutrient view, not just calories.
3. Look for patterns, not single-day dips. One low day doesn't matter; a consistent shortfall does.
4. Adjust with whole foods first before reaching for supplements.
5. Re-check after a few weeks to confirm the change worked.

If you find a persistent gap—especially B12, D, or iron—talk to a healthcare provider before supplementing, since dosing and interactions depend on your situation.

You can track and compare nutrients in your food by logging meals in a nutrition tracker, reviewing your daily totals against targets, and comparing individual foods or recipe ingredients side by side. MyFoodData is built for this: it tracks 30+ nutrients, lets you log foods and recipes, and shows comparisons of everything you log. The free account covers the core tracking and comparison features; Premium removes ads and adds sharing and unlimited photo/voice entry.

Start by deciding which nutrients you actually care about

Tracking everything at once is noisy. Pick a small set based on your goal:

• Protein and amino acids — if you're building or maintaining muscle, or checking whether a plant-based mix covers all essential amino acids.
• Vitamins and minerals — if you're addressing a specific gap (iron, calcium, B12, vitamin D) or just want broad micronutrient coverage.
• Macros (calories, carbs, fat, protein) — if weight or energy balance is the main question.

MyFoodData tracks 30+ nutrients and shows an amino acid profile when you build recipes, so you can go deeper than macros without switching tools.

Log your meals to get a daily nutrient picture

1. Create a free account (no credit card required).
2. Search for a food and add it to your log, or scan a package barcode to pull it up quickly.
3. Enter the amount you ate.
4. Repeat for each meal.
5. Open your results view to see nutrient totals for the day against your custom targets.

The expected result is a running total per nutrient, so you can see at a glance which ones you've met and which are still short. MyFoodData also lets you view comparisons of all the foods you log, which turns a day of entries into a ranked view of where your nutrients came from.

Compare foods and ingredients side by side

This is where tracking turns into decisions. Two approaches:

Compare whole foods. Log or search several foods and view their nutrient data next to each other. If you're choosing between two breakfast options, the comparison shows which delivers more of your target nutrient per serving.

Compare recipe ingredients. The recipe nutrition calculator lets you tab between ingredients and see how each one shifts the combined nutrition. You can also view the amino acid profile of the finished recipe — useful when combining grains and legumes to cover essential amino acids.

A practical example: if your logged day is short on iron, compare a few candidate foods at the same serving size, pick the one that closes the gap without blowing past your calorie target, and swap it into tomorrow's plan.

Check data quality before you trust a number

Not all food databases are equal. Crowdsourced entries can be incomplete or wrong. MyFoodData marks foods with Verified Badges (Checkmark and Checkmark+) in search results, indicating entries with the most complete data. When a nutrient number matters to a decision, prefer a verified entry over an unverified one — and if a food has no verified version, treat its micronutrient values as approximate.

Build recipes and meal plans around the results

Once you know your gaps, you can plan rather than react:

• Save recipes and reuse them, so recurring meals don't need re-entry.
• Use day plan and food log meal entry to sketch a full day before you eat it.
• Print or share your foods, recipes, and meal plans — MyFoodData keeps them organized in one place.
• Log on the go from the Android or iOS app after planning on the web.

What's free and what Premium adds

If you only need to log foods and compare nutrients, the free tier covers it. Premium is worth considering if ads bother you, you want to manage profiles for other people, or you want to log by photo or voice instead of typing.

Common snags

• Serving-size mismatch. Comparing foods at different serving sizes gives misleading results — normalize to the same amount before deciding.
• Incomplete entries. A food with missing micronutrient fields will look artificially low. Check for a verified badge.
• Targets set once and forgotten. Custom targets should reflect your current goal; revisit them when your goal changes.
• Logging without reviewing. The value is in the results view and comparisons — logging alone doesn't tell you anything.

Nutrients are the substances your body uses for energy, growth, repair, and regulation. You get them by eating a varied diet and, if you want to know whether you're actually meeting your needs, by tracking what you eat against nutrient targets. The practical split is macronutrients (protein, carbohydrates, fat) versus micronutrients (vitamins and minerals). This explainer covers both, the main food sources, and how to compare foods by nutrient density instead of calories alone.

Macronutrients vs. micronutrients

Macronutrients are needed in large amounts and are measured in grams. Micronutrients are needed in small amounts and are measured in milligrams or micrograms. Most nutrition trackers stop at macros; the deeper value is in the micronutrient side, which is where gaps usually hide.

Key vitamins, roles, and food sources

• Vitamin A — vision, skin, immune function. Liver, carrots, sweet potato, spinach.
• Vitamin C — collagen, antioxidant, iron absorption. Citrus, bell peppers, broccoli, strawberries.
• Vitamin D — calcium absorption, bone and muscle. Fatty fish, egg yolks, fortified milk; sunlight also matters.
• Vitamin E — antioxidant. Nuts, seeds, vegetable oils, spinach.
• Vitamin K — blood clotting, bone. Kale, spinach, broccoli, Brussels sprouts.
• B vitamins (B1, B2, B3, B6, B12, folate) — energy metabolism, red blood cells, nerves. Whole grains, legumes, eggs, meat, leafy greens. B12 is mainly in animal products.
• Calcium — bones, teeth, muscle and nerve function. Dairy, fortified plant milks, tofu, leafy greens.
• Iron — oxygen transport in blood. Red meat, lentils, beans, spinach; pair with vitamin C for better absorption.
• Zinc — immunity, wound healing. Meat, shellfish, legumes, seeds.
• Magnesium — muscle and nerve function, blood sugar. Nuts, seeds, whole grains, leafy greens.
• Potassium — fluid balance, blood pressure. Bananas, potatoes, beans, yogurt.

How to read a nutrition label or food data

1. Check the serving size first. All numbers below it refer to that amount, not the whole package.
2. Scan the macros. Protein, total carbohydrate (with fiber and sugars broken out), and fat.
3. Look at the micronutrient rows. Vitamins and minerals are listed as a percentage of a daily value (%DV). 5% or less is low; 20% or more is high.
4. Note what's missing. Labels only list a subset of nutrients. A food database that tracks 30+ nutrients will show more than the package does.
5. Compare like with like. Two foods only compare fairly at the same serving size.

Comparing foods by nutrient density, not just calories

Calories tell you energy; nutrient density tells you what you get for those calories. A simple method:

• Pick a fixed amount, such as 100 grams or one cup.
• List the nutrients each food provides at that amount.
• Favor the food that delivers more vitamins, minerals, fiber, and protein for a similar calorie count.

Example: 100 g of white rice and 100 g of cooked lentils are in a similar calorie range, but lentils add substantially more fiber, iron, and folate. That's a nutrient-density win, not a calorie win.

Common nutrient gaps and simple foods that fill them

• Fiber — most people fall short. Fill it with beans, lentils, oats, whole grains, berries, and vegetables.
• Vitamin D — limited in food. Fatty fish, egg yolks, and fortified milk or plant milk help; sunlight is the other source.
• Iron — especially relevant for menstruating people and vegetarians. Lentils, beans, spinach, and fortified cereals; combine with vitamin C.
• Calcium — dairy, fortified plant milks, tofu, and leafy greens.
• Potassium — bananas, potatoes, beans, and yogurt.

Tracking it in practice

If you want to see your own intake rather than estimate it, a tracker that logs meals and compares them against targets makes the gaps visible. MyFoodData, for example, states that it tracks 30+ nutrients and offers free barcode scanning, recipe and day-plan entry, and verified food badges, with a free account and no credit card required. Premium removes ads and adds features such as unlimited photo scanning, voice entry, and profile sharing. Use whatever tool fits, but the underlying method is the same: log what you eat, compare against targets, and adjust the foods that fall short.

Dietary minerals are naturally occurring elements your body needs in small amounts to build bone, move muscles, carry oxygen, and regulate fluids and nerve signals. You get them from food and water, not from making them yourself. The two practical questions are which minerals matter most and where they show up on a plate. Major minerals (calcium, magnesium, potassium, sodium) are needed in larger amounts; trace minerals (iron, zinc, selenium, iodine) are needed in tiny amounts but are just as essential. Below is what each does and which foods supply it, plus how to check your own intake.

What minerals are, and how they differ from vitamins

Vitamins are carbon-based compounds that your body can sometimes modify or store. Minerals are single elements — calcium, iron, potassium — that keep their identity and cannot be broken down by heat, light, or cooking. That difference has two consequences:

• Cooking doesn't destroy minerals the way it destroys some vitamins. Boiling can leach water-soluble minerals like potassium into the cooking water, but the mineral itself survives heat.
• Minerals interact with each other. Too much of one can crowd out another, which is why food sources generally beat isolated high doses.

Your body needs them for structural jobs (bone, teeth), signaling jobs (nerve impulses, muscle contraction), and transport jobs (oxygen in blood).

Major minerals: roles and food sources

These are the minerals your body needs in amounts of roughly 100 mg per day or more.

Most people in typical Western diets get plenty of sodium and phosphorus and often fall short on potassium, magnesium, and calcium. That pattern is worth knowing before you add supplements.

Trace minerals: small amounts, big jobs

Trace minerals are needed in milligrams or micrograms per day.

Two practical notes: iron from animal foods (heme iron) is absorbed more efficiently than iron from plants (non-heme iron), and pairing plant iron with vitamin C improves absorption. Brazil nuts are so selenium-dense that a couple a day can cover your needs — more is not better here.

Signs of deficiency and who may be at risk

Deficiency symptoms are often vague, which is why they're easy to miss. This is general information, not a diagnosis — persistent symptoms warrant a clinician's evaluation.

• Iron: fatigue, pale skin, shortness of breath, cold hands and feet. Higher risk: menstruating women, pregnant people, vegetarians and vegans, frequent blood donors.
• Calcium: muscle cramps, tingling in fingers, brittle nails; long-term shortfall contributes to low bone density. Higher risk: people who avoid dairy without substitutes, postmenopausal women.
• Magnesium: muscle twitches, cramps, fatigue, poor sleep. Higher risk: people with digestive conditions that reduce absorption, heavy alcohol use.
• Zinc: slow wound healing, frequent infections, loss of taste or smell. Higher risk: vegetarians (phytates in grains and legumes reduce absorption), older adults.
• Iodine: thyroid-related symptoms such as fatigue and weight changes. Higher risk: people who avoid iodized salt and seafood.
• Potassium: muscle weakness, cramps, irregular heartbeat. Higher risk: people on certain diuretics.

If you suspect a deficiency, the useful next step is to look at what you actually eat over a week rather than guess from a single day.

How to check your mineral intake with a food tracker

A tracker turns "I think I eat well" into a list of numbers you can compare against targets. MyFoodData is built for this — its comparison table states it tracks 100+ micronutrients free, where other apps paywall micronutrients, and it offers verified food badges, free barcode scanning, and web plus Android and iOS apps. Premium removes ads and adds unlimited photo scanning, unlimited voice entry, custom day plans, and profile sharing; the free tier keeps the nutrient depth.

A workable routine:

1. Log everything for 3–7 days, including drinks and cooking oils. Partial logging produces misleading mineral totals.
2. Open the nutrient breakdown for each day and look at calcium, magnesium, potassium, iron, and zinc first — these are the ones most commonly short.
3. Use verified badges when picking foods in search, so you're comparing against complete data rather than a sparse entry.
4. Compare foods side by side — for example, two breakfast options — to see which one closes your gap instead of guessing.
5. Adjust one meal at a time. Adding a serving of beans, a handful of seeds, or a cup of yogurt is easier to sustain than rebuilding your whole diet.

Expected result: after a few days you'll see which minerals you consistently hit and which you consistently miss, and you can target the misses with specific foods from the tables above.

Common snags: crowdsourced entries with missing mineral values can make a food look empty when it isn't — prefer verified entries. And a single low day means little; look at the pattern across the week.

Quick reference: one food, several minerals

If you want efficiency rather than a long shopping list, these foods cover multiple minerals at once:

• Beans and lentils: potassium, magnesium, iron, zinc, copper, manganese
• Leafy greens (spinach, kale): calcium, magnesium, potassium, iron, manganese
• Nuts and seeds: magnesium, zinc, selenium, copper, manganese
• Dairy and fortified plant milks: calcium, potassium, phosphorus, iodine
• Whole grains: magnesium, iron, zinc, selenium, manganese
• Seafood: iodine, selenium, zinc, iron, copper

Build meals around two or three of these categories and most mineral gaps close without supplements.