Dietitians Recommend These 9 Ingredients for the Best Weight-Loss Smoothie Recipe

A source of healthy fats and omega-3s, hemp seeds will also add protein. One 60-calorie tablespoon offers 3.3 grams of protein, 0.8 grams of omega-3s (the daily recommendation is 1.1 grams), 0.7 grams of fiber, and has just 0.7 grams of carbs. Also worth noting, hemp seeds offer all nine essential amino acids, making it a complete protein, so it's a great way to get some healthy, plant-based protein into your smoothie if you're not a fan of protein powder. Try hemp seeds in this banana blueberry hemp seed smoothie.

The key to weight loss is filling up on low-cal foods that are high in fiber to keep you satiated longer. Flaxseeds contain both soluble and insoluble fiber, and when ground into flaxseed meal and added to a smoothie, you'll hardly taste it. As a bonus, flax also offers essential omega-3 fatty acids. Try this pumpkin protein smoothie that offers over 11 grams of fiber.

Leslie said you can also add chia seeds, which are also a great source of healthy fats and fiber to keep you satiated. Try this strawberry protein smoothie that includes cottage cheese for the protein source.

Getting enough daily protein is a must if you're trying to lose weight, because it satiates hunger and helps you feel full. While protein powder is a great way to increase the protein in your smoothie, silken or soft tofu is another easy plant-based source, suggested Leslie. It's virtually flavorless and adds an incredible creaminess — you have to taste it to see for yourself.

Here's a smoothie that tastes like a vanilla milkshake made with soft tofu, soy milk, and peanut butter that offers more than 17 grams of protein.

Adding beans to your smoothie seems like a weird idea, but just like tofu, it adds a creamy consistency without any flavor. But Leslie said what's really important is the added fiber and protein it offers to keep you full and satisfied all morning long.

Give this blueberry mango kiwi kale smoothie a try, and you'll wonder why you didn't start adding beans to your blender sooner.

For the milk option in your smoothie, Leslie suggested adding yogurt (soy or almond if you're dairy-free) or kefir not only for the protein boost, but also for the probiotics.

It's an easy ingredient to add to smoothies and to save even more calories and sugar, go for plain instead of flavored. This almond berry banana yogurt smoothie offers 15 grams of protein.

Eating monounsaturated fats (MUFAs) can add to that "I'm full" feeling and avocados are an excellent source that also add hunger-satiating fiber. This clear-skin smoothie is made with ripe avocado, but remember to only add one-quarter of an avocado to your blender if you're trying to lose weight since they're high in calories.

Berries offer tons of fiber and are lower in carbs than most fruits. Try this low-carb high-protein berry smoothie made with blueberries and raspberries. The almost seven grams of fiber will keep that "I'm full" feeling going strong to discourage mindless snacking.

Nuts and nut butters offer protein and healthy fats to make your smoothie more satiating. You can add peanuts, almonds, walnuts, pecans, or cashews to your blender, or the nut butters made from them. Seeds like pumpkin and sunflower are also great options.

Try this sweet low-carb raspberry protein smoothie made with almond butter.

To increase the fiber and up the vitamins in your smoothie, throw in a big bunch of baby spinach or kale (fresh or frozen). Added fiber will not only help you stay full, but it can also prevent constipation which won't help you lose weight, but will make your belly look flatter and less bloated.

Mix up this blueberry kale avocado protein smoothie that offers 10 grams of fiber.