I don't follow the exante plan but i follow a VLCD which was set up and advised by my doctor and nutritionist for which i am being monitored by and is very safe :)
I tried this with my last diet and to be honest i thought it was horrible and it doesnt taste anywhere near like coke...I have diet coke now as its alot less in kcals and i love the taste (even prefer it more than normal coke) x