Sir, we read with great interest the item in the BDJ titled 'Largest study of its kind reveals increased risk of tooth loss due to obesity'1 on the latest evidence from a research group in Shiga University.2

A central principle of our training was that multidisciplinary education is needed for any positive impact to be made on a person or population's quality of life (QoL). As undergraduates, it was compulsory for dental and dental hygiene and therapy students to undertake interprofessional engagement projects. One project included working with dietitians within the Faculty of Health. It was one of the most informative parts of our training - particularly as diet plays a central role in the carious process - possibly more than tooth brushing.3

A basic learning point with the students was the definition of 'obesity' and the different bands of 'body mass index'(BMI). A BMI of 24.9 is described as 'healthy weight'. A BMI of '25.0 to 29.9' is described as 'overweight'.4 It's interesting, therefore, that this article describes those with a BMI of >25 as 'obese' and makes its conclusion based on this.

The British Dietetic Association's page on BMI makes mention of 'weight stigma' which it says 'can be unhelpful in supporting people to better manage their weight'.5

We welcome the new evidence but are hopeful that the British Dietetic Association's opinion and NHS guidelines can be more considered to avoid confusion in future.