Yes, although it is difficult to lose belly fat in just a week, it is possible to lose water weight which reduces bloating. It is essential to reduce the salt intake in your diet, as it causes water retention. Drinking an adequate amount of water also assists in reducing belly fat. It is important to pile up on vegetables, which serve as a healthy low-calorie meal, Oatmeal and whole grain breads, along with a cup of green tea. Refrain from eating processed or junk food. Regular exercise is a must. Your exercise regime must focus on intensive cardio, coupled with ab exercises which focus on strengthening your core muscles.