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Soluble fiber disperses in water, and some forms become viscous or highly fermentable; insoluble fiber retains more structure and contributes bulk. Oats, barley, legumes and fruit supply soluble fiber, while wheat bran, whole grains and many vegetables contribute more insoluble fiber. Most whole plant foods contain both.
The most concentrated plant omega-3 foods provide mainly ALA. A 1 oz serving of flax provides about 6.4 g ALA, chia about 5 g, and walnuts about 2.57 g. The body converts only part of ALA into EPA and DHA; algae oil is a direct non-fish source of DHA and, depending on the product, EPA.
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.
No. Oranges are an excellent vitamin C source, but they do not top the fruit list. Orange provides about 53 mg per 100 g, green kiwi about 90 mg, and guava can exceed 200 mg per 100 g. Orange is famous because it is common and convenient, not because it holds the record.
Bananas are a good source of potassium, but they are not uniquely high. A medium banana provides about 420 mg; a medium baked potato can exceed 600 mg, and a cup of cooked beans or lentils can approach or exceed 700 mg.
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.
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.
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.