NutriBlasts can be used as a meal replacement or in addition to your regular meals depending on your goals and the amount and type of ingredients you put in the smoothie. If you're looking to lose weight I suggest using a Blast in place of one or two of your meals and ensuring that you include ingredients that will make it a well-balanced meal (carbs, protein, and healthy fats.) This is the basis of our new weight loss program, LEAN. You can learn more here: https://www.nutribulletlean.com/
For more weight loss tips and recipes, search "weight loss" here on NutriLiving. Here's one to get you started: https://www.nutriliving.com/blog/10-best-breakfast-smoothies-for-weight-loss
For a meal replacement aim for about 350-400 calories and at least 18g of protein per Blast then adjust as needed.