Actually, it doesn't matter if you want to mix grapes and avocados to make juice, try not to add added sugar to the juice, so that your sugar intake doesn't become excessive.
Avocado fruit itself contains potassium, lutein, folic acid, and vitamins B, C, and E. So it is good for health. However, this fruit is a type of fruit that has a high fat content. But don't worry, the type of fat possessed by avocados is monounsaturated fat which is good for health as long as the amount is not excessive. While grapes contain various vitamins A, B, C and also flavonoids, polyphenols which are good for health to maintain endurance.