Final answer:
Studies show that for effective weight loss, a combination of diet and exercise is required. Exercise increases basal metabolic rate, but to sustain weight loss, managing caloric intake is vital. Exercise alone doesn't typically lead to long-term weight loss.
Step-by-step explanation:
The question addresses the impact of exercise on weight loss and the effectiveness of different approaches. Numerous studies indicate that successful weight loss comes from a combination of dietary changes and increased physical activity. Solely relying on exercise without dietary adjustments usually limits the weight loss and its maintenance over time. Regular exercise does help burn calories and can raise our basal metabolic rate (BMR), which means you burn more calories even at rest. Additionally, it contributes to the development of leaner body tissue, which is metabolically more active than fat tissue.
However, the challenge lies in the balance of caloric consumption and expenditure. For instance, engaging in physical activity can burn food energy at a rate of 400 to 500 watts, but consuming something as simple as a cup of yogurt can contribute 1360 kJ (325 kcal), which can offset the caloric deficit achieved by exercise. Therefore, while exercise is beneficial for health and can assist in losing fat, for long-term weight loss and management, a combination of a nutritious, low-calorie diet and consistent physical activity is essential.