Hi I understand your concern. For reducing belly fat, only walks does not help much, you need to do aerobic exercises with abdominal exercises 4/5 times a week. Along with that have complex carbs which helps in weight loss, green tea, fruits and vegetables to increase your metabolism which helps in belly fat loss. If you want personalized guidance you can connect to me through practo.

Take 2-3 litres of water everyday. Take high fiber low fat diet. Do crunches and pushups daily. Take small and frequent meals at regular intervals of 2-3 hrs.