Primary care-led weight management for remission of type 2 diabetes (DiRECT): an open-label, cluster-randomised trial

Lean MEJ, Leslie WS, Barnes AC, Brosnahan N, Thom G, McCombie L, Peters C, Zhyzhneuskaya S, Al-Mrabeh A, Hollingsworth KG, Rodrigues AM, Rehackova L, Adamson AJ, Sniehotta FF, Mathers JC, Ross HM, McIlvenna Y, Stefanetti R, Trenell M, Welsh P, Kean S, Ford I, McConnachie A, Sattar N, Taylor R · 2018 · Lancet

DOI: 10.1016/S0140-6736(17)33102-1View source ↗

“At 12 months, diabetes remission was achieved in 68 (46%) participants in the intervention group and six (4%) participants in the control group.”

Summary

DiRECT is the trial that proved type-2 diabetes is reversible through structured weight loss in routine primary care. 306 adults aged 20–65 with T2D diagnosed within the past six years and BMI 27–45 were enrolled across 49 GP practices in Scotland and Tyneside; the practices, not the patients, were randomised. The intervention had three phases: total diet replacement (an 825–853 kcal/day formula diet for 3–5 months) with diabetes and blood-pressure medications stopped, structured food reintroduction over 2–8 weeks, then long-term weight-maintenance support. At 12 months, 46% of intervention participants achieved diabetes remission (HbA1c < 6.5% off all glucose-lowering medications) compared to 4% of usual-care controls. Mean weight loss was 10 kg in the intervention arm versus 1 kg in the control arm. Remission tracked weight loss tightly: 86% of those losing ≥15 kg achieved remission, while none who gained weight did.

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References cited by this entry

ExtendsEffects of Intermittent Fasting on Health, Aging, and Diseasede Cabo R & Mattson MP · 2019
The de Cabo & Mattson 2019 NEJM review cites VLCD-driven T2D remission evidence in this lineage when discussing the metabolic-switch mechanism.

Entries that reference this one

ContradictsMetabolic Impact of Intermittent Fasting in Patients With Type 2 Diabetes Mellitus: A Systematic Review and Meta-analysis of Interventional StudiesBorgundvaag E et al. · 2021
DiRECT's specific intervention (3–5 month total diet replacement) drove ~46% remission; this meta-analysis of broader IF protocols shows IF in general gives weight benefit but not HbA1c benefit beyond standard diet. The design specificity matters.
ExtendsPathogenesis of type 2 diabetes: tracing the reverse route from cure to causeTaylor R · 2008
Taylor's twin-cycle hypothesis is the mechanistic foundation that DiRECT (Lean 2018) tested at scale; the trial confirmed that reversing the cycle reverses the disease.
ContradictsThe effect of a low-carbohydrate, ketogenic diet versus a low-glycemic index diet on glycemic control in type 2 diabetes mellitusWestman EC et al. · 2008
Westman drove HbA1c improvement through ketosis (without total caloric restriction); DiRECT drove similar improvements through caloric restriction (without ketosis specifically). Both work, by different mechanisms.
ExtendsEffectiveness and Safety of a Novel Care Model for the Management of Type 2 Diabetes at 1 Year: An Open-Label, Non-Randomized, Controlled StudyHallberg SJ et al. · 2018
Where DiRECT used a balanced-macronutrient VLCD to drive T2D remission, the Virta program used sustained nutritional ketosis. Both produce similar 1-year glycemic and weight outcomes through different mechanistic levers.
ContradictsOmega-3 polyunsaturated fatty acids (PUFA) for type 2 diabetes mellitusHartweg J et al. · 2008
DiRECT-style total-diet-replacement intervention drove T2D remission via weight loss; Hartweg's 2008 Cochrane shows omega-3 supplementation alone does not affect glycemic control in T2D — different intervention scales, different mechanisms.