Some people can lose more than 2 pounds in a week with a dedicated fitness program and serious dietary restrictions.The time and effort required to lose weight that quickly is grueling and usually unsustainable, though. Even if you can lose a notable amount of weight in a week, a lot of it will be water weight -- not true belly fat. Weight you lose quickly is likely to be regained quickly too.
Listen to your mum - dieting is faddish. Instead, improve the "quite" to "all" healthy and eat only nutritionally balanced, healthy foods. Cut out all sweets and junk foods, apart from an occasional treat, as humans would have always done till recent times. The exercise is important, and include plenty of stealth exercise, such as taking the stairs instead of the elevator and cycling to the shops instead of driving, etc.
“Belly fat or abdominal fat is the subcutaneous (which means under the skin) fat that sits around the waist and provides a store of energy, and also protection and heat, for the organs,” says Tarik Belalij, personal trainer and nutritionist at Everyone Active Becontree Leisure Centre. “Small amounts of fat below the skin is normal and healthy, it is the visceral fat, which surrounds the organs that can be the most dangerous type of fat – leading to heart attacks and diabetes.”