Dietary habits survey conducted as part of the borderline diabetes trial Survey literature, correspondence and results relating to a survey on dietary habits as part of the borderline diabetes trial conducted on selected participants from the Whitehall Study cohort. The control study looked at the effect of intervention on a high-risk group [volunteers with high blood sugar levels] with participants being allocated into four groups: placebo, placebo plus carbohydrate restriction, phenformin, or phenformin plus diet restriction. 1967-1970