Portion plates work

Portion plates have been used for some time to help people lose weight. They remind people to increase their serves of low carb vegies and reduce the meat and carb portions when serving dinner. Research has now been done to document how people found using them.
A UK study used crockery and serving spoon sets for people in a weight loss program. People in the study were happy to use both but the plates were used more often. The research showed that the plates reduced self- servings of chips and potato and increased serves of low carb vegies and salad. 
By reminding people to reduce their carb serves, these portion plates have "the potential to induce modest loss" and are simple and inexpensive.

These are the plates used in the study from the USA (Precise Portions) and include a drinking glass. The Australian plates I stock are below. They look quite different but the principle is the same. It would be good to have feedback from people who have used any of these before and if they have helped them. I certainly find they help all my clients who use them! 

Here's the link to the research-
​https://www.cambridge.org/core/journals/british-journal-of-nutrition/article/acceptability-and-potential-effectiveness-of-commercial-portion-control-tools-amongst-people-with-obesity/1EE7393072C13C96CB8B66B90D61AEC4/core-reader