YSK to lose weight, fill up with foods low in caloric density and high in fiber, like fruits and vegetables. This can trigger satiety without the overload of calories and beats going hungry long term.
Why YSK: many countries have issues with weight, such as mine with 74% of US adults being overweight or obese. The global weight loss industry is over $200 billion yearly, with many influencers, pills, and surgeries promising quick results with little effort. These often come with side effects, or don't work long term.
Studies suggest filling yourself with foods low in caloric density and high in fiber, like fruits and vegetables, can help reach and maintain a healthy weight. It's good to have these foods available in our living spaces to make the choice easy. Your taste buds will likely adapt to love them if you're not there yet.
Like the other commenter said, it's about the calorie density, not the calories.
An apple makes you satisfied longer than an equivalent number of calories of Oreos, so if you get to snack as much as you want on either, you'll eat fewer calories of apple than of Oreo over a given timeframe.
You can over eat either of them, it's just easier with one than the other.
Similarly, something like a steak can fill you up a lot, for a very long time, but has enough calories in it that it's still better to not eat for every meal.
Fruits have plenty of fiber, which helps increase satiety, which is what's important here. Also check the difference between a candy bar and a piece of friut, and then think about which fills you up better with fewer calories. Density matters too, it's much easier to snarf down a bunch of candy than to eat the same caloric value in fruit.
Most fruits are low calorie with a lot of them having less than 100 kcal per 100g. There are some exceptions such as Avocado (due to fat content actually) and dates as well dried fruit (prunes at 300/100g vs plums at 45/100g).
Strawberries, cherries, apples, figs, bananas all are below 100kcal/100g. Obviously some are better at filing you up than others.