Very Low Calorie Diet and Diabetes Remission: DiRECT Trial Results

What Is the DiRECT Trial?

The Diabetes Remission Clinical Trial, known as the DiRECT trial, is one of the most significant studies in diabetes research in recent decades. Led by Professor Roy Taylor and Professor Mike Lean, this landmark UK-based trial demonstrated that type 2 diabetes is not necessarily a lifelong condition. With the right dietary intervention, remission is achievable for a substantial number of patients.

How the Trial Worked

The DiRECT trial enrolled 298 adults between the ages of 20 and 65 who had been diagnosed with type 2 diabetes within the past six years. Participants were randomly assigned to either a structured weight management program or continued standard diabetes care.

Those in the intervention group followed a very low calorie diet (VLCD) of approximately 825 to 853 calories per day for 12 to 20 weeks. The diet consisted of formula meal replacements, eliminating normal food intake during this phase. After the initial low-calorie period, food was gradually reintroduced over 2 to 8 weeks, followed by long-term support to maintain weight loss.

The control group received standard diabetes management according to existing clinical guidelines, including medication adjustments as needed.

Key Findings at One Year

The results published in The Lancet in 2018 were remarkable. At the one-year mark:

• 46% of participants in the intervention group achieved diabetes remission, compared to just 4% in the control group.
• Nearly 24% of intervention participants lost 15 kg or more.
• 86% of those who lost 15 kg or more achieved remission.
• Participants in the intervention group reduced or eliminated their diabetes medications significantly.

Remission was defined as an HbA1c level below 48 mmol/mol (6.5%) after at least two months without glucose-lowering medications.

Two-Year and Five-Year Follow-Up Results

The research team continued to track participants beyond the initial year. The two-year results, also published in The Lancet, showed that 36% of intervention participants remained in remission — a drop from 46%, but still significantly higher than the control group. Weight regain was identified as the primary reason some participants fell out of remission.

Five-year follow-up data, published in 2024, confirmed that approximately 13% of intervention participants maintained diabetes remission five years after the trial began. While this figure is lower than earlier results, researchers emphasize that it highlights the importance of sustained weight management support and ongoing lifestyle maintenance to preserve remission long-term.

Why Does Weight Loss Trigger Remission?

Professor Roy Taylor's research supports the twin cycle hypothesis, which proposes that excess fat accumulates in the liver and pancreas, impairing insulin production and increasing insulin resistance. A very low calorie diet rapidly depletes this fat, allowing the pancreas to recover its ability to produce insulin effectively.

This mechanism explains why remission rates are closely tied to the amount of weight lost. The more weight a participant shed, the more likely they were to achieve and maintain remission.

Who Is a Good Candidate for a VLCD?

The DiRECT trial specifically studied individuals diagnosed with type 2 diabetes within the past six years. Evidence suggests that those with a shorter duration of diabetes have a higher likelihood of achieving remission, as beta cell function in the pancreas may not yet be permanently impaired.

Important considerations include:

• Medical supervision is essential before starting any very low calorie diet.
• Certain medications, especially insulin and sulfonylureas, must be carefully adjusted to avoid hypoglycemia.
• VLCDs are generally not recommended for pregnant women, individuals with certain eating disorders, or those with specific medical conditions.

What This Means for Diabetes Care

The DiRECT trial has reshaped how many healthcare providers think about type 2 diabetes. Rather than viewing it solely as a progressive disease requiring increasing medication, clinicians now recognize that remission through lifestyle intervention is a realistic and evidence-based goal for many patients.

Several national health guidelines, including those from the NHS in the UK, have incorporated structured low-calorie programs into their type 2 diabetes management pathways as a direct result of this research.

Conclusion

The DiRECT trial provides powerful evidence that type 2 diabetes can go into remission through significant dietary-driven weight loss. While maintaining remission requires ongoing commitment, the findings offer genuine hope to millions of people living with type 2 diabetes worldwide. If you are considering a very low calorie diet for diabetes management, speak with your healthcare team to determine whether it is appropriate for your individual circumstances.