Vegetable smoothies are good to our health especially if you mix fruit too on it.
Smoothie doesn't require you to add processed sugar to taste better if you add fruits like banana and apples these are enough to sweeten your smoothie recipe. According to AuthorityNutrition.
“Sugar” is Bad… But it Depends on The Context
Many people now believe that because added sugars are bad, the same
must apply to fruits, which also contain fructose.
However… this is completely wrong because fructose is only harmful in
large amounts and it is almost impossible to overeat fructose by
eating fruit.
There's a lot of evidence that excessive intake of fructose can surely harm your body but it is not applicable for fruits because fruits are loaded with fiber, water and have significant chewing resistance. And therefore most fruits like apples will take a while to eat and digest, meaning that the fructose hits the liver slowly.
You can also add foods that are rich in protein and healthy fats like Coconut oil, almonds, and avocados. They help to slow the release of sugar during digestion. If you are looking for other recipes try these healthy smoothie recipes that are very helpful to your health.
Aside from that if you have an active lifestyle natural sugar won't affect your health.