When you are trying to lose weight, you should add fruit smoothies to your diet because you’ve heard or read that smoothies aid in weight loss.
Smoothies do help you loose weight especially when taken on an empty stomach. It helps detoxify the body, burn excess fat, and even gives you radiant skin.
However, your smoothie may actually be making you add pounds without you knowing it. Smoothies can make you gain weight if you are making individual mistakes while preparing them.
Why Your Smoothies Are Making You Add Weight
Your smoothies will cause you to add more weight when;
Your Smoothie Skimps on Fibre
Fibre is as close to a magic weight-loss pill as you’re going to get. Fibre fills you up to prevent hunger so you end up eating less later in the day. Fruits do offer fiber—but that’s only if you pick the right ones.
Bananas are one of the most common ingredients in smoothies, but half of one only offers 1.4 grammes of fibre. Try to get at least 10 grammes of fibre in your smoothie by adding fiber-rich foods such as berries, kale (kale has twice as much fibre as spinach), avocado, kiwi, pear, beans, flax meal, chia seeds, and certain plant-based protein powders.
Your Smoothie Recipe Lacks Protein
Your smoothie may be green as can be, but that doesn’t mean it contains the protein you need to sustain your energy throughout the day. To resist the urge to snack on high-calorie pick-me-ups, go for at least 10 grammes of protein per smoothie. 
Some good sources of protein are: milk or soy milk (instead of lower-protein almond milk), Greek yoghurt (it has more protein than the regular kind), cottage cheese, protein powder, soft tofu, beans, nuts, or nut butter
You Overdo it on the Fruits
Starting your day with a cold, creamy smoothie made solely from a variety of fruits is much healthier than downing a doughnut. But while fruits are full of fibre and nutrients, they aren’t void of calories. So when you fill your blender with five different fruits, you may end up with a smoothie that contains more than 500 calories.

 Since fruits are full of natural sugars, your body also metabolises them quickly, leaving you with hunger pangs within an hour. To avoid this issue, pair your fruit with a protein source such as milk, soy milk, yoghurt, protein powder, soft tofu, beans, nuts, or nut butter.
 You Add Extra Sweeteners To Your Recipe
One tablespoon of honey or maple syrup will add to your smoothie over 60 extra calories—and you don’t need it if your smoothie contains naturally sweet fruit. Added sweeteners can also be found in flavoured yoghurt, fruit juice, sweetened milk, and fruits canned with syrup. So avoid the extra sugars, and experiment with using plain yoghurt and unsweetened soy or almond milk instead.