The first food: oatmeal. Instant oatmeal can be directly soaked in milk or yogurt for meal replacement. When I was losing weight, I soaked Jason's oats in milk the night before, and then I could make oatmeal directly the next day, with a piece of cornflakes. It's really delicious, and the calories are not high.
The second food: food substitutes. I bought a konjac-flavored oatmeal cookies online before, and it tastes a little sweet. When I have breakfast every morning, two tablets are enough. This kind of biscuit needs no extra sugar, tastes slightly sweet and has low calories, so it can be used as a diet meal.
The third food: coffee. You can drink coffee with skimmed milk or skimmed milk powder, which is also low in calories and can play a certain role in losing weight.
The fourth food: fruit. Fruits, such as apples or grapefruit, can be eaten as a meal, which can not only make you feel full, but also have low calories, and can supplement your body's vitamins. Kiwifruit has a certain stovepipe function, and bananas can remove edema. Other fruits with high sugar content will lose weight better if you eat less.
The fifth food: vegetables. Vegetables are also very effective in losing weight, and you can supplement some vitamins like fruits.