I hear about right size smoothies all the time and I found some information that I thought some might find interesting.
Right size smothies
two of the main ingredients are 50mg caffeine and Guarana (a caffeine containing plant that shows up frequently in weight loss products)
To get an idea what 50mg caffeine is equivelent to, here is a list of drinks which contain caffeine.
As with any diet always consult a doctor.
