This 12-month, randomised study of individuals with established type 2 diabetes investigated whether dietary advice emphasising a single message to reduce fat intake, would improve weight loss, glycaemic and lipid control, compared to advice based on the once traditional lowfat, low-sucrose message. Participants (n=37, mean BMI 33.25 (+1.0) kg/m2, age 58.0 (+3.3) years, diabetes duration 6.8 (±0.9) yrs, 51% male), were randomised into 2 dietary groups. The 'moderate-sucrose' group (n=19) were advised to reduce total fat intake only; the 'low-sucrose' group (n=18), to reduce both total fat and total sugar intake. Repeated measures ANOVA determined group effects on anthropometric/biochemical variables and Spearman's rank correlations determined relationships between changes in diet and study variables. Reported energy and fat intake significantly reduced in both groups, with no difference in reported sucrose intake. HbA1c fell in both groups (7.7% -7.1% (low-sucrose) vs 7.6% -7.4% (moderate-sucrose), both p=0.003), with no additional effect of the single dietary message. HOMA-IR fell by 33.4% in the 'low-sucrose' group (p≤0.005), but not in the moderate sucrose group. Advice to relax sucrose intake restrictions in favour of a single low fat message had no additional effect on reported behaviour or glycaemic control.