What is the best way for me to lose weight if i gained 15 lb in one year?

Increase activity: For most people, adding moderate exercise such as a daily 30 minute walk will result in slow, sustainable weight loss. Along with this, try to eliminate high-calorie beverages and substitute water. This combination often results in a difference of 500 calories daily, which adds up to a pound a week. Over a few months that 15 pounds will be gone.