Nutritionally-at-risk pregnant women refers to pregnant women, including teenage mothers, with a low pre-pregnancy body mass index (BMI) or those who do not gain sufficient weight during pregnancy, with any of the following predisposing factors: narrowly-spaced pregnancies and births, situated in families with low income, with large number of dependents where food purchase is an economic problem, has previously given birth to a preterm or low birth weight infant, or other unfavorable prognostic factors, such as obesity or anemia, with diseases which influence nutritional status such as diabetes, tuberculosis, drug addiction, alcoholism and mental disorder. (Sec. 6(l), R.A. No. 11148)