A healthy diet is crucial to a successful pregnancy and a healthy baby. We recommend that couples enjoy a balanced diet and take regular exercise. The healthiest Body Mass Index for fertility is the same as what is considered "normal weight" - a BMI between 19 and 25. HARI recommend that females have a BMI of 30 or less before commencing treatment.
How to calculate your BMI - Log in here and enter your details - http://www.nhlbisupport.com/bmi/