Rankings and source guides that compare foods using a clear nutritional, culinary or quality criterion.
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Creatine is concentrated in animal muscle. Herring is among the richest commonly cited foods, while pork, beef, salmon, and other fish also provide meaningful amounts. A normal serving usually supplies well under a typical 3–5 g supplemental dose.
There is no single food that is “highest in electrolytes” because potassium, calcium, magnesium, sodium, and chloride have different food sources. Potatoes and legumes are strong for potassium; dairy and fortified alternatives for calcium; seeds, nuts, and legumes for magnesium; and salt or salty foods for sodium and chloride.
Fatty fish are among the few naturally concentrated sources of vitamin D. UV-exposed mushrooms can also provide meaningful amounts, while egg yolk and liver contribute smaller amounts. In the United States, fortified milk and some plant beverages and cereals are important because there are relatively few naturally rich everyday foods.
Compared dry, whole wheat and spelt can provide roughly 14–15 g protein per 100 g, oats about 13 g, hulled barley 12–13 g, rye around 10 g, and brown rice about 7–8 g. Cooking adds water and sharply lowers the per-100-gram number.
By dry weight, hulled barley and rye are among the highest-fiber common grains, often around or above 15 g per 100 g. Bulgur and oats commonly provide about 10–13 g, while brown rice is closer to 3–4 g. Processing changes the numbers substantially.
Among common vegetables, raw spinach provides about 2.7 mg iron per 100 g, beet greens about 2.6 mg, asparagus near 2.1 mg, and Swiss chard around 1.8 mg. These are total-iron numbers; vegetable iron is nonheme and is generally absorbed less efficiently than heme iron.
Watermelon and strawberries are among the most water-rich fruits at about 91% water. Cantaloupe is around 90%, peaches about 89%, grapefruit roughly 88%, and oranges around 87%. Two hundred grams of watermelon therefore contains about 182 grams of water.
Among leafy vegetables, beet greens stand out at more than 700 mg potassium per 100 g in common databases; spinach is around 560 mg, Swiss chard around 380 mg, and Brussels sprouts near 390 mg. Serving size and cooking method change the amount you actually eat.
Bell peppers are standouts: yellow peppers can exceed 180 mg vitamin C per 100 g and red peppers are around 125 mg in common composition tables. Raw broccoli and Brussels sprouts are often around 80–90 mg per 100 g.
Some leafy greens contain substantial calcium: raw collards and certain kale entries can exceed 200 mg per 100 g, bok choy is around 100 mg, and broccoli around 45–50 mg. The number alone is not enough, because spinach calcium is much less bioavailable due to oxalate.
Among common raw vegetables, cucumber and lettuce are near 15 calories per 100 g, zucchini about 17, tomato 18, green bell pepper around 20, and spinach about 23. Their very high water content explains the low energy density.
If protein is the priority, soy is usually the most consistent choice at roughly 7–9 g per cup, while some pea-protein beverages are around 7–8 g. Oat milk often provides 2–4 g, almond milk 1–2 g, and rice milk about 0–1 g, although brands vary widely.