1. Diet - Vi 90 Day challenge. If you really want to lose weight Visalus is the greatest diet. It isn't like other drink you have ever had. 1. Diet - Vi 90 Day challenge. If you really want to lose weight Visalus is the greatest diet. It isn't like other drinks for diet. But it a drink you can mix with low cal low fat milk. You can mix with anything that is low cal and make the drinks of your choose. That makes it so much easier than just drinking strawberry, vanilla and chocolate. You choose what type you want to drink. Which makes it easy to do. If you drink one shake a day it will maintain you weight, give you more energy, build muscle tone, get at least 30% of nutrition you need each day. To me this is very important for the young and old most importantly. Children never eat right and older people slow down eating whether it is due to lack of money or lack of appetite.