Side-by-side differences between foods, varieties, formats and methods, with comparable data and the context needed to interpret it.
Oranges are excellent vitamin C sources, but they do not top the fruit list. Their reputation grew from convenience, availability, citrus marketing, and the fact that one ordinary orange supplies a meaningful amount. Kiwi, guava, and some berries can provide more vitamin C per 100 grams.
Bananas became strongly associated with potassium because they are convenient, inexpensive, portable, and common in sports nutrition—not because they contain more than every other food. A medium banana provides about 420 mg, a useful amount that many foods and servings can exceed.
Meat is much more protein-dense per 100 g: cooked chicken breast provides about 31 g and lean beef around 29 g, compared with roughly 9 g in cooked lentils or chickpeas. Legumes, however, provide about 6–8 g fiber per 100 g and can contain as much or more total iron, although it is non-heme iron and is absorbed less efficiently than heme iron from meat.
Chia and flax are nutritionally similar but not identical. Per 1 oz, chia provides about 9.8 g fiber and 5.0 g ALA; flax provides about 7.7 g fiber and 6.4 g ALA. Flax is best eaten ground so its nutrients are easier to access, while chia can be eaten whole.
Roasted nuts are not automatically less healthy than raw nuts. Roasting lowers moisture and can reduce some heat-sensitive compounds, but protein, minerals, and most of the fat profile change little. Added oil, salt, sugar, or coatings often matter more than roasting itself.
In a 1-ounce serving, almonds provide about 164 calories, 6 g of protein and 3.5 g of fiber; walnuts provide about 185 calories, 4.3 g of protein and 1.9 g of fiber. Walnuts, however, provide roughly 2.5 g of ALA omega-3, while almonds are far richer in vitamin E. Neither wins every category.
Avocado and olive oil share a fat profile dominated by oleic acid, but they are not equivalent foods: 100 g of avocado provides about 160 calories, 15 g of fat and 6–7 g of fiber; one tablespoon of olive oil provides about 120 calories and 14 g of fat with virtually no fiber or protein. Avocado is a water-rich whole food; oil is concentrated fat.
A useful comparison is not 100 g versus 100 g: 100 g of avocado provides about 160 calories, while 1 ounce of almonds provides about 164. At similar calories, almonds supply more protein and concentrated fat; avocado provides much more water and volume and still delivers substantial fiber. Both are rich in unsaturated fats but play different roles.
Cooked quinoa provides more protein and fiber than white rice at similar calories: about 4.4 grams of protein and 2.8 grams of fiber per 100 grams versus roughly 2.7 grams and 0.4 gram. It also has fewer carbs, about 21 grams versus 28. The advantage is real, but a serving of quinoa still functions more like a grain base than a main protein source.
Cottage cheese and Greek yogurt are both high-protein dairy foods and are quite close: each often provides around 10–12 grams of protein per 100 grams. The bigger difference is sodium, with cottage cheese often several times higher. Calories depend on fat level, and typical serving size can change total protein more than the small per-100-gram gap.
Egg white is a very efficient way to add protein: one large white provides about 3.6 grams for just 17 calories. A whole large egg provides roughly 6.3 grams and 70–75 calories because it includes the yolk. That yolk carries almost all the fat, but also much of the choline, vitamins A, D and B12, carotenoids and other micronutrients.
Cooked chicken breast is much more protein-dense, at about 31 grams per 100 grams versus roughly 15–18 grams in firm tofu. Tofu, however, provides unsaturated fat, some fiber and can be a substantial calcium source when made with calcium sulfate. They can fill the same place on a plate without being gram-for-gram equivalents.