Fruits contain fruit sugar or ‘fructose’ which does not raise blood sugar levels unlike other form of sugar like table sugar, glucose, honey etc. Any form of added sugar in fruit juices or fruit milkshakes can increase your blood sugar levels; so it is better to always buy fully-ripe and sweet fruits to avoid adding any sugar or sugar substitute.
Remember, natural is always better! Besides this, grapes are also rich in antioxidants, cancer-fighting flavonoids and vitamin C. Not to forget that the apples and oranges their share of substance, flavour and nutrients to this drink, making it a pleasant surprise to your taste-buds and health!