- Patients with uncontrolled high blood pressure will be excluded. The cut off for raised blood pressure has been taken as > 140/90mmHg. Patients with systolic blood pressure between 140-150mmHg and diastolic blood pressure between 90-95mmHg may be accepted, since we have found that on the diet their blood pressures tend to be lowered into the acceptable range. For patients in the above normal range (as above), a letter will be required from the physician responsible for their care. Patients will be excluded if they change the type or dose of their blood pressure treatment during the study.