Here we go again

I have been on a new diet now for 2 months called Sensa.  I have lost 31 pounds on it and it really worked for me.  Ofcoarse my job allows me to work out every day and a free gym.  But my wife likes the way I have changed my life style and lost all the weight that she now wants to try the sensa.  But like all diet supplements, they work on some and not on others.  I just don't want her to think its a maricle drug and then it not work and get very depressed.  Should I convence her not to take it or just let her try it and try not to coach her if she doesn't lose weight.  She doesn't like to go to the gym and doesn't really have much time too even if she did like it  being a full time student and mother.