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Comparison of Commercial WeightComparison of Commercial Weight
Loss Diets in the UK:Loss Diets in the UK:
The BBC Diet TrialsThe BBC Diet Trials
Adapted from
Truby et al. BMJ 2006;
doi:10.1136/bmj.38833.411204.80
Ref

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BBC Diets TrialBBC Diets Trial
To compare changes in weight loss, body fat,
and dieting behavior in participants randomized
to 4 commercially available weight loss
programs:
• Atkins diet: Self-monitored, low carbohydrate
• Slim Fast: Meal replacement
• Weight Watchers: Energy-controlled, group meetings
• Rosemary Conley’s: Low-fat, weekly group exercise
Objective
Truby et al. BMJ 2006; doi:10.1136/bmj.38833.411204.80 Ref

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BBC Diets TrialBBC Diets Trial
Study Design
Truby et al. BMJ 2006; doi:10.1136/bmj.38833.411204.80 Ref

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BBC Diets TrialBBC Diets Trial
Baseline Demographics
Truby et al. BMJ 2006; doi:10.1136/bmj.38833.411204.80 Ref
Atkins
(n=57)
WW
(n=58)
Slim Fast
(n=59)
RC
(n=58)
Control
(n=61)
Age (yrs) 41 40 39 41 41
Weight (kg) 90 89 90 90 88
BMI (kg/m2
) 32 31 32 32 32
Body fat (kg) 36 34 36 35 33
Body fat (%) 41 40 41 40 39
Waist circ (cm) 102 100 101 100 100
Systolic BP (mm Hg) 135 127 129 130 130
Diastolic BP (mm Hg) 83 80 81 82 81
Glucose (mg/dL) 98 98 100 101 99
Total chol (mg/dL) 225 218 213 220 226

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BBC Diets TrialBBC Diets Trial
-4.4
-2.86
-2.68
-3.17
-5
-4.5
-4
-3.5
-3
-2.5
-2
-1.5
-1
-0.5
0
kg
Results: Weight Loss at 4 Weeks
Truby et al. BMJ 2006; doi:10.1136/bmj.38833.411204.80 Ref
Atkins
Weight
Watchers
Slim
Fast
Rosemary
Conley
* *P<0.001 vs all other groups

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BBC Diets TrialBBC Diets Trial
-5.2
-4.7
-3.7
-4
-0.4
-6
-5
-4
-3
-2
-1
0
kg
Results: Weight Loss at 2 Months
Truby et al. BMJ 2006; doi:10.1136/bmj.38833.411204.80 Ref
Atkins Weight
Watchers
Slim
Fast
Rosemary
Conley
All P<0.001 vs control
Control

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BBC Diets TrialBBC Diets Trial
-1.3
-2.2
-1.4
-2.4
0.9
-3
-2.5
-2
-1.5
-1
-0.5
0
0.5
1
1.5
Control
kg
Results: Weight Loss Months 2-6
Truby et al. BMJ 2006; doi:10.1136/bmj.38833.411204.80 Ref
Atkins
Weight
Watchers
Slim
Fast
Rosemary
Conley
All P<0.001 vs control

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BBC Diets TrialBBC Diets Trial
-6
-6.6
-4.8
-6.3
0.6
-7
-6
-5
-4
-3
-2
-1
0
1
Control
kg
Results: Weight Loss 0-6 Months
Truby et al. BMJ 2006; doi:10.1136/bmj.38833.411204.80 Ref
Atkins Weight
Watchers
Slim
Fast
Rosemary
Conley
All P<0.001 vs control

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BBC Diets TrialBBC Diets Trial
-1.9
-1.6
-1
-1.5
-0.1
-2
-1.8
-1.6
-1.4
-1.2
-1
-0.8
-0.6
-0.4
-0.2
0
kg
Results: % Fat Loss at 2 Months
Truby et al. BMJ 2006; doi:10.1136/bmj.38833.411204.80 Ref
Atkins Weight
Watchers
Slim
Fast
Rosemary
Conley
All P<0.001 vs control
Control

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BBC Diets TrialBBC Diets Trial
-1.3
-2
-1.2
-2.1
0
-2.5
-2
-1.5
-1
-0.5
0
kg
Results: % Fat Loss Months 2-6
Truby et al. BMJ 2006; doi:10.1136/bmj.38833.411204.80 Ref
Atkins Weight
Watchers
Slim
Fast
Rosemary
Conley
All P<0.001 vs control
Control

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BBC Diets TrialBBC Diets Trial
-3.1
-3.6
-2.1
-3.4
0.1
-4
-3.5
-3
-2.5
-2
-1.5
-1
-0.5
0
0.5
kg
Results: % Fat Loss Months 0-6
Truby et al. BMJ 2006; doi:10.1136/bmj.38833.411204.80 Ref
Atkins
Weight
Watchers
Slim
Fast
Rosemary
Conley
All P<0.001 vs control
Control

12. www.dave.md
BBC Diets TrialBBC Diets Trial
-7.2
-4.1
-2.7
-4.5
-2.8
-8
-7
-6
-5
-4
-3
-2
-1
0
mmHg
Results: Systolic BP Change Months 0-6
Truby et al. BMJ 2006; doi:10.1136/bmj.38833.411204.80 Ref
Atkins
Weight
Watchers
Slim
Fast
Rosemary
Conley Control

13. www.dave.md
BBC Diets TrialBBC Diets Trial
-4.9
-4.4
-2.5
-3.6
-1.6
-6
-5
-4
-3
-2
-1
0
mmHg
Results: Diastolic BP Change Months 0-6
Truby et al. BMJ 2006; doi:10.1136/bmj.38833.411204.80 Ref
Atkins
Weight
Watchers
Slim
Fast
Rosemary
Conley Control

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BBC Diets TrialBBC Diets Trial
-3.4
-8.3
-3.4
-4.9
-2.5
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
mg/dL
Results: Change in Glucose Months 0-6
Truby et al. BMJ 2006; doi:10.1136/bmj.38833.411204.80 Ref
Atkins
Weight
Watchers
Slim
Fast
Rosemary
Conley Control
*
*P<0.05 vs control

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BBC Diets TrialBBC Diets Trial
-11.3
-21.5
-13.7
-19.5 -19.5
-25
-20
-15
-10
-5
0
mg/dL
Results: Change in Total Cholesterol Months 0-6
Truby et al. BMJ 2006; doi:10.1136/bmj.38833.411204.80 Ref
Atkins
Weight
Watchers
Slim
Fast
Rosemary
Conley Control
*
*P<0.05 vs control

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BBC Diets TrialBBC Diets Trial
45
19
36
0
5
10
15
20
25
30
35
40
45
50
Still on original diet Swapped diet Following own program
%
Results: Follow-up at 12 Months
Truby et al. BMJ 2006; doi:10.1136/bmj.38833.411204.80 Ref
N=158

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BBC Diets TrialBBC Diets Trial
• All 4 diet approaches equally effective
at 6 months
• “One size does not fit all”
• Emphasis on weight loss, maintaining
weight loss is necessary
Conclusions
Truby et al. BMJ 2006; doi:10.1136/bmj.38833.411204.80 Ref

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