Answer :Susan B. Roberts, PhD, director of Tufts HNRCA Energy Metabolism Laboratory and author of The I Diet http://www.instinctdiet.com, replies: My clinical observation is that for some people they help and for others they dont. It depends on how you use them. If they are a substitute for with-sugar drinks and over time you look on them as a bridge to a low-sugar and low-sweet diet, that is a great way to go in my opinion! Weight loss is hard for many people and you need to use all the help you can.