Cycling can be an effective way to lose weight, but we should pay attention to the following points: 1. Perseverance: cycling once or several times can't achieve the effect of losing weight, and it needs long-term persistence. Ride 3-5 times a week or more, and each ride time is not less than 30 minutes.

2. Moderate exercise: Beginners need to gradually increase the intensity of exercise, and don't ride too hard at first, so as not to cause harm to the body.

3. Reasonable diet: Weight loss should be achieved not only through exercise, but also through a reasonable diet and proper intake of protein, carbohydrates and fat.

4. Diversified exercise: A single cycling exercise is not conducive to body fat loss, and it needs to be combined with other aerobic exercises and strength training, such as running, swimming and weightlifting.

Therefore, if you want to lose weight by cycling, you need to persevere, combine proper exercise with reasonable diet, and achieve better results.