The disadvantages might be that over time people will begin to rely on this technology too much and stop looking after what they consume. This might further affect surrounding organs and might turn into a serious health issue.
Also, after some time this procedure might become so popular that people would all achieve the body weight they wish to have and will all end up looking identical, which might cause some problems due to human nature being as competitive as it is. Anything could really happen - the future is very unpredictable sometimes. These patients might face some health problems from all the ultra sound exposure and it could be identified as one of the cancer activators in the future?!
