Dr. Linda Stern and her colleagues recruited 132 obese adults at the Philadelphia Veterans Affairs Medical Center in Pennsylvania. She wants to conduct a study where she tests the ability of the ketogenic diet versus a normal calorie restricted diet to see which has a larger weight loss effect. Which of the following plans should she use?

Plan A: She should randomly assign half of the participants to take part in a six-week ketogenic diet, and the other half take part in a normal calorie restricted diet and measure their weight loss result.

Plan B: She should choose the most obese half of people according to their BMI and randomly assign one group to take part in a six-week ketogenic diet, and the other half take part in a normal calorie restricted diet and measure their weight loss result.

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