Final answer:
Billy can lose weight by creating a calorie deficit through consuming fewer calories or burning more calories through exercise. Increasing physical activity, such as cycling, can help him burn extra calories. A combination of exercise and a balanced diet is more effective for weight loss.
Step-by-step explanation:
In order to lose weight, Billy needs to create a calorie deficit by consuming fewer calories than he burns. Since Billy wants to lose 30lbs, he needs to create a deficit of 30lbs * 3500 calories per pound = 105,000 calories. Based on his Total Daily Energy Intake of 2,150 kcals per day, he would need to consume fewer calories or increase his activity level to burn more calories.
One way Billy can achieve this is by increasing his exercise, specifically through activities that burn a significant amount of calories. For example, cycling can burn approximately 400 to 500 watts (W) of food energy. To work off an extra 1000 kJ (238.85 kcal), which is equivalent to approximately 285 calories, Billy would need to cycle for a certain duration depending on his individual calorie burn rate.
Billy should also consider his dietary intake. A single cup of yogurt can contain 325 kcal (1360 kJ), so he may need to reduce his calorie intake by choosing healthier, lower-calorie options. Overall, a combination of exercise and a balanced diet will be more effective in achieving weight loss compared to relying on exercise alone.