Exercise is essential to lose weight. The energy cost of physical activity must exceed the energy supplied by your food intake. Weight loss is directly equated to physical work, not food deprivation.
Weight loss means fat-burning.
Most weight loss dieters experience increased-efficiency as calories are restricted. No significant weight loss may be seen in a sedentary obese person until energy intake has dropped below 800 calories per day. The jogger or swimmer is losing weight. Even the walker is losing weight, although more slowly. Hunger must be restored as a normal, welcome feeling.