Low calorie sweeteners do help in weight control. They do not stimulate appetite or hunger.
Numerous studies have shown that replacing sugar with low calorie sweeteners leads to a decreased or unchanged sensation of hunger in the short-term (meal to meal). Short-term hunger is most strongly affected by volume and fibre: drinking non-caloric or reduced-calorie liquids and eating high-fibre foods is the best way to reduce hunger between meals.
Internationally eminent scientists such as Andrew Renwick, Ph.D., University of Southampton, and Barbara Rolls, Ph.D., Pennsylvania State University, have reviewed all available research data on low calorie sweeteners, appetite and hunger. They conclude that sweeteners do not promote hunger and actually lead to decreased energy intakes.
Adam Drewnowski, Ph.D., University of Michigan (Nutrition Reviews), reviewed numerous studies that have investigated this question and reported that there is no evidence that the addition of sweet taste is a stimulus to hunger or the desire to eat. And although low calorie sweeteners are not appetite suppressants, their ability to increase the palatability of low calorie foods may actually promote a person's ability to stick to a low calorie diet.
A number of studies, including those by Drewnowski et al. and Raben et al., show that the use of low calorie sweeteners contributes to weight control.
Evidence shows that the calories saved by using low calorie sweeteners at one meal are not made up for by eating more at the next meal. Of course, a person wishing to lose weight has to make a conscious effort to this end to obtain a lasting result.