Smoothies can help you lose weight. Make sure you're keeping track of the calories, just as you would do with the other food you eat. Try to keep the sugar content low, and maybe mix protein powder in it, if you're using it as a meal replacement.
Better way to lose weight, Protein+Carbs( Healthy ) + 2 glasses of water before every meal will help plus workout with a variety such as Mountain Climber (30 sec.) Plank ( 30 sec. ) and Knee - Elbow Crunches ( 30 sec.) done 3x times in a row everyday 5 min. Workout.