1. Salad: Salad is a nutritious and low-calorie fast food choice. You can choose a variety of vegetables, fruits, olive oil and low lipoprotein, such as chicken breast or beans.

2. Stir-fry vegetable slices: However, you should choose your own roasted vegetables, pour a little olive oil, a little salt and other seasonings, such as pepper or coriander. Whether it's broccoli, black fungus or spinach, you can try it.

3. Sandwich: Choose whole wheat bread or vegetable rolls instead of white bread, and choose low-fat protein, such as turkey, lean meat or vegetable salad as a sandwich.

4. Boiled jiaozi: Boiled jiaozi is a very healthy choice, and the minced meat, vegetables and/or beans can be used as fillings.

5. Yogurt: Yogurt is a nutritious fast food. You can choose sugar-free and low-fat options. Fresh fruits or nuts can be added to improve the taste.

It should be noted that although these foods are low-calorie fast food, we should pay attention to controlling our weight and making our own fast food.

In addition, these choices are relatively healthy to some extent, but they should not be the only dietary choice to lose weight. Eating more vegetables during weight loss is as important as healthy protein. It is best to follow the advice of a doctor or dietitian and design a nutritious diet plan according to personal preferences and needs.