Belly fat, or visceral fat, is fat stored in and around your abdominal organs. It can increase your risks of cancer, high blood pressure, stroke, dementia, heart disease and diabetes.[1] You cannot lose large quantities of weight or excess body fat within - especially visceral or belly fat. To get healthier and lose the dangerous belly fat, you'll need to change your diet, exercise routine and lifestyle over a longer period of time. However, during a week you can start to make some great, health-promoting changes to your lifestyle.