Breakfast should consist of fruit only.
There is no evidence that eating only fruit at breakfast has any health or weight loss benefits. Most fruits are not very high in complex carbohydrates, which the body needs after an all-night fast. They are, however, a good source of fibre and vitamins. Cereal foods (especially wholegrain varieties) like bread, crumpets, muffins and breakfast cereals are a much better source of carbohydrates to get you going in the morning.