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Avocado is not the only source of unsaturated fat. One tablespoon olive oil provides about 14 g fat, 1 oz almonds about 14 g, 1 oz walnuts about 18–19 g, and a 5 oz salmon serving roughly 17–20 g depending on species. Olive oil and avocado lean monounsaturated; walnuts and seeds are richer in polyunsaturated fat; fatty fish provides EPA and DHA.
You can get a substantial amount of protein without meat. Greek yogurt, cottage cheese, eggs, fish, tofu, tempeh, seitan, edamame and legumes can all contribute meaningfully; the useful comparison is how much protein a normal serving supplies, not which food looks most concentrated per 100 grams.
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.
You can meet calcium needs without dairy, but the source matters. One cup of fortified soy milk often provides about 300 mg, 5.3 oz calcium-set tofu can provide 300–500 mg or more, and 3.5 oz sardines with bones roughly 350–380 mg. Greens such as kale and bok choy provide less per serving but their calcium is relatively well absorbed.
Bananas are a useful potassium source, but they are not among the most concentrated foods. A banana provides about 358 mg per 100 g. Baked potatoes, cooked spinach, beans, avocado, and some fish can exceed that amount, and one medium baked potato can provide roughly 700–900+ mg depending on size and preparation.
Orange provides about 53 mg vitamin C per 100 g, but it does not lead the ranking. Raw red bell pepper is around 125–130 mg/100 g, kiwi about 90 mg, and raw broccoli close to 89 mg. Cooking can reduce vitamin C, so the state of the food matters as much as its position in a table.
You can get substantial iron without meat. Cooked lentils provide about 3.3 mg per 100 g, beans roughly 2.5–3.7 mg, many tofu products about 2–5 mg, and 1 oz pumpkin seeds about 2.5 mg. Plant foods provide non-heme iron, which is absorbed less efficiently than heme iron, so vitamin-C-rich foods can improve absorption.
Canned tuna can be a healthy protein food, but the type matters. FDA/EPA lists canned light tuna, usually skipjack, as a Best Choice and albacore/white tuna as a Good Choice because albacore typically contains about three times more mercury. For people who are pregnant or breastfeeding, canned light can fit 2–3 fish servings per week, while albacore is limited to one serving in a week.
Rice can be eaten frequently, even daily, as part of a balanced diet, but it does not need to be the only grain. FDA notes that rice absorbs arsenic more readily than many crops and recommends dietary variety. Rotating rice with oats, wheat, corn, barley, quinoa, and other grains broadens nutrition and reduces dependence on one food source.
Potatoes are not automatically unhealthy when eaten often. They are a starchy vegetable that can provide potassium, vitamin C, carbohydrate, and fiber. The bigger differences come from portion size, frying, added fats and salt, and whether the meal includes vegetables and protein.
Yes. For most people, soy foods such as tofu, tempeh, edamame, and soy milk can be part of a daily diet. Current human evidence does not show that normal soy-food intake increases breast cancer risk. Concentrated isoflavone supplements are a separate category and should not be treated as nutritionally equivalent to a serving of tofu.