Fruit ripeness, seasonality, storage, safety, nutrition and practical signs of quality.
Açaí is the fruit of Amazonian Euterpe palms. Its pulp is unusual among fruits because much of its energy comes from fat rather than sugar, and it can provide fiber and anthocyanins. Frozen purée, freeze-dried powder, drinks and bowls are not nutritionally interchangeable because water, added sugar and toppings change the numbers dramatically.
Plain açaí pulp and an açaí bowl are not the same food. A current 100 g unsweetened frozen packet provides 70 calories, 5 g fat, 3 g fiber and 0 g total or added sugar. Prepared bowls can contain far more calories and sugar because the recipe—not the açaí alone—includes fruit, granola, syrups and other toppings.
Skins of some fruits and vegetables concentrate fiber, polyphenols, and minerals, so peeling can reduce them. The size of the loss varies greatly and does not make the flesh nutritionally poor. Rinse produce before peeling.
Dates are dried fruit, so they concentrate both energy and sugar. Medjool dates provide about 277 calories, 66–67 g of sugars and 6.7 g of fiber per 100 g. Two large dates, roughly 48 g, contain about 133 calories, 32 g of sugars and 3.2 g of fiber. They offer more than sweetness alone, but they are not a low-sugar fruit.
Per 100 g, Medjool dates provide about 277 calories, 66–67 g of sugars and 6.7 g of fiber; granulated sugar has roughly 387 calories, 100 g of sugar and no fiber. At equal weight, dates contain less sugar and energy because they also contain water and fiber. That makes them a more complete food, not an unlimited sweetener: 20 g of dates still has about 55 calories and 13 g of sugars.
Dates and raisins are both concentrated dried fruits. Per 100 g, Medjools have about 277 calories, 66–67 g of sugars and 6.7 g of fiber; raisins have roughly 299 calories, 59 g of sugars and 3.7 g of fiber. In a 30-g serving, that is about 83 calories and 20 g of sugars for dates versus 90 calories and 18 g for raisins. Dates provide more fiber; raisins are not automatically higher in sugar by weight.
Prunes concentrate nutrients and sugars as fresh plums lose water. Per 100 g they provide about 240 calories, 38 g of sugars and 7.1 g of fiber. A 30-g serving—roughly four to five prunes depending on size—has about 72 calories, 11 g of sugars and 2.1 g of fiber. Their effect on bowel function is not just about fiber; prunes also contain sorbitol and other fruit compounds.
Dried fruit does not automatically gain sugar; removing water concentrates what was already in the fruit. Raisins provide roughly 299 kcal and 59 g sugar per 100 g, compared with about 69 kcal and 15.5 g sugar in fresh grapes. Fiber and minerals are concentrated too, but a calorie-dense portion is much easier to eat quickly.
100% juice is not simply whole fruit in liquid form from a practical nutrition standpoint. Sugar can be similar per 100 g, but juice retains very little fiber and a normal glass can concentrate the sugar from several pieces of fruit. Whole fruit usually produces more satiety because its structure, volume and fiber remain intact.
Avocado wins on potassium and fiber per 100 grams, but it also carries almost twice the calories of banana. Serving size changes the picture: a medium banana can provide more total potassium than half an avocado simply because the edible portion is larger.
Frozen fruit can be nutritionally very similar to fresh fruit. Fiber and minerals change little; vitamin C and other sensitive compounds may decline somewhat during processing or storage, but freezing then slows further deterioration. Fruit frozen soon after harvest can retain some nutrients as well as or better than fresh fruit stored for many days.
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.