1. Spinach: Spinach is an excellent source of fiber and antioxidants, which can help to reduce inflammation in the body and promote weight loss. It's also high in vitamins and minerals like vitamin K, vitamin A, and folate.

2. Cauliflower: Cauliflower is a low-calorie, high-fiber vegetable that can help to promote weight loss and reduce belly fat. It is also rich in vitamins and minerals like vitamin C, vitamin K, and potassium.

3. Avocado: While avocado is a fruit, it is high in monounsaturated fat, which has been shown to help reduce belly fat. In addition to being a good source of healthy fat, avocado is also high in fiber, which can help to keep you feeling full and satisfied.

4. Cucumber: Cucumber is a low-calorie, hydrating vegetable that can help to reduce bloating and flush out excess water weight. It is also a good source of antioxidants and vitamin K, which can help to improve overall health.

5. Zucchini: Zucchini is a low-calorie, low-carb vegetable that is high in fiber and water content. It can help to fill you up and reduce cravings, making it an excellent choice for weight loss.

6. Green Beans: Green beans are a low-calorie, high-fiber vegetable that can help to promote weight loss and reduce belly fat. They're also a good source of vitamins and minerals like vitamin K and vitamin C. 

Incorporating these vegetables into your diet can help to fight belly fat by reducing inflammation, promoting weight loss, and improving overall health. Eating a variety of these vegetables in different ways like roasted, sautéed, or steamed can keep your diet interesting and delicious. But, always remember that eating a healthy diet alone is not the only solution for weight loss, combining a healthy diet with regular exercise, adequate sleep and stress management is the key for optimal health and wellness.