Every person is unique so it's individual but overall, a calorie deficit is the best way to lose weight. Personally, I boost the effect by taking Xenical (read more about it at Canada Drugs) but it's necessary to consult a doctor first. Make sure to exclude sugar, bakery, and alcohol from your nutrition as well.
Physical activity, such as walking, is important for weight control because it helps you burn calories. If you add 30 minutes of brisk walking to your daily routine, you could burn about 150 more calories a day. Of course, the more you walk and the quicker your pace, the more calories you'll burn.