Vegetables that help to fight belly fat are largely those with high water content, including celery and bok choy. This is because water is important to the body, can prevent a variety of health conditions and will "put pressure on the metabolism" to help an individual lose weight and have a flatter stomach, according to Canadian Living. Avocado also helps to fight belly fat; it contains lots of mono-saturated fats that stop blood sugar spikes, which cause the body to store fat around the midsection.
Foods other than vegetables can also help with belly fat reduction. These include high fiber foods such as ground flaxseed and apples and yogurt due to the healthy gut bacteria that it promotes.