The secret to effective long-term weight-loss in order to have more energy is to reduce your daily calorie intake and start to exercise regularly. People become overweight by leading a sedentary life-style that is highlighted by a poor diet. Other factors such as diabetes and genetics also play a part in a person being overweight. But this does not mean that it cannot be controlled.
The energy levels for an overweight person are significantly less than an average or fit individual, because the total body mass is difficult to move around and puts a strain on the individual. The food that an overweight person consumes is also directly responsible for low energy levels.