A new technology to monitor the portion sizes and calorie intake of obese patients is being trialled on adolescents at Bristol Royal Hospital in the UK.

The portable weighing scale Mandometer is put under the plate of food and connected to a small screen plotting food removal over time and gives instant feedback on people’s eating habits, according to a study on bmj.com.

Researchers at Bristol Royal Hospital for Children and the University of Bristol conducted the study on 106 obese patients aged nine to 17.

During the trial, the group of adolescents that received Mandometer therapy had a significantly lower average body mass index, smaller portion size and lower body fat score than the standard care group, the study said.

The speed of eating in the Mandometer group was also reduced by 11% compared with a gain of 4% in the other group.