1. Some smoothies are surprisingly helpful in losing weight. For example, this recipe contains peanut butter, which is rich in protein. Due to bananas and peanuts, you will get the sufficient amount of protein that your body craves for. Ingredients: 1/2 banana 1/2 cup of low-calorie peanut butter 1/2 cup skim milk 6 ice cubes 1 tbsp of whey protein with chocolate flavor Combine all ingredients and blend until smooth.