The 3D Study

What does the "3D" Longitudinal Study Stand For?

How does Diet change with a Diagnosis of Type 2 Diabetes? The “3D” Longitudinal Study.

The 3D Longitudinal Study is so named because seeing something in three dimensions adds clarity. In this case it refers to the 3D’s of Diet, after Diagnosis with Type 2 Diabetes.

What is the 3D Longitudinal Study?

The 3D Longitudinal Study is a prospective observational cohort study of 225 Australian adults with newly diagnosed Type 2 diabetes. In 2018, Diabetes Australia worked with my research team to recruit a randomly invited sample of adults who had been diagnosed with Type 2 Diabetes in the previous 6 months. Two waves of recruitment have been completed. These are outlined below.

The 3D Longitudinal Study uses an observational approach to provide a detailed, quantitative understanding of participants’ glycemic control (primary outcome) and diet quality change in the 12months following their diagnosis.

Demographic, physical and psychosocial characteristics (specific details here ) are also being collected.

The study has five data collection points that are spaced 3 months apart. These are outlined below.


Why is this research important?
Improving the diet quality of individuals newly diagnosed with Type 2 Diabetes leads to a reduced risk of complications, regardless of medication use. However, previous research has shown that when individuals are diagnosed with Type 2 Diabetes, they receive considerable amounts of conflicting dietary advice, which often results in them feeling overwhelmed and confused about which foods are optimal to eat.

Many individuals report that, over time, they return to eating the foods they did before they were diagnosed with diabetes, whilst others report that they are able to sustain improvements in their diet quality. It’s unclear what extent individuals actually change their diet after diagnosis, and why some people are able to sustain these changes over time, but not others. It is essential to understand this area of research in order to develop strategies that can better support all individuals to have long-term success in improving their diet quality and help reduce the risk of complications.

What are the aims of The 3D Longitudinal Study?
The three aims of this study are to:
(i) identify associations between glycaemic control and diet quality in the 12 months following T2D diagnosis,
(ii) describe diet quality changes in the 12 months following diagnosis, and
(iii) identify the demographic, physical and psychosocial predictors of sustained improvements in diet quality and glycaemic control in the 12 moths following diagnosis.

Registration and ethics approval details:
The 3D Longitudinal Study is registered with Australian New Zealand Clinical Trials (ANZCTR) (ref: ACTRN12618000375257) and has been approved by the Griffith University Human Research Ethics Committee (ref: 2017/951).