Abstract
BACKGROUND: Low birth weight (LBW) is an important public health problem in undernourished populations.
OBJECTIVE: We tested whether improving women's dietary micronutrient quality before conception and throughout pregnancy increases birth weight in a high-risk Indian population.
DESIGN: The study was a nonblinded, individually randomized controlled trial. The intervention was a daily snack made from green leafy vegetables, fruit, and milk (treatment group) or low-micronutrient vegetables (potato and onion) (control group) from > 90 d before pregnancy until delivery in addition to the usual diet. Treatment snacks contained 0.69 MJ of energy (controls: 0.37 MJ) and 10-23-carotene, riboflavin, folate, vitamin B-12, calcium, and iron (controls: 0-7. The primary outcome was birth weight.
RESULTS: Of 6513 women randomly assigned, 2291 women became pregnant, 1962 women delivered live singleton newborns, and 1360 newborns were measured. In an intention-to-treat analysis, there was no overall increase in birth weight in the treatment group (+26 g; 95 -15, 68 g; P = 0.22). There was an interaction (P < 0.001) between the allocation group and maternal prepregnant body mass index (BMI; in kg/m(2)) [birth-weight effect: -23, +34, and +96 g in lowest (<18.6), middle (18.6-21.8), and highest (>21.8) thirds of BMI, respectively]. In 1094 newborns whose mothers started supplementation > 90 d before pregnancy (per-protocol analysis), birth weight was higher in the treatment group (+48 g; 95 1, 96 g; P = 0.046). Again, the effect increased with maternal BMI (-8, +79, and +113 g; P-interaction = 0.001). There were similar results for LBW (intention-to-treat OR: 0.83; 95 0.66, 1.05; P = 0.10; per-protocol OR = 0.76; 95 0.59, 0.98; P = 0.03) but no effect on gestational age in either analysis.
CONCLUSIONS: A daily snack providing additional green leafy vegetables, fruit, and milk before conception and throughout pregnancy had no overall effect on birth weight. Per-protocol and subgroup analyses indicated a possible increase in birth weight if the mother was supplemented >3 mo before conception and was not underweight. This trial was registered at www.controlled-trials.com/isrctn/ as ISRCTN62811278
OBJECTIVE: We tested whether improving women's dietary micronutrient quality before conception and throughout pregnancy increases birth weight in a high-risk Indian population.
DESIGN: The study was a nonblinded, individually randomized controlled trial. The intervention was a daily snack made from green leafy vegetables, fruit, and milk (treatment group) or low-micronutrient vegetables (potato and onion) (control group) from > 90 d before pregnancy until delivery in addition to the usual diet. Treatment snacks contained 0.69 MJ of energy (controls: 0.37 MJ) and 10-23-carotene, riboflavin, folate, vitamin B-12, calcium, and iron (controls: 0-7. The primary outcome was birth weight.
RESULTS: Of 6513 women randomly assigned, 2291 women became pregnant, 1962 women delivered live singleton newborns, and 1360 newborns were measured. In an intention-to-treat analysis, there was no overall increase in birth weight in the treatment group (+26 g; 95 -15, 68 g; P = 0.22). There was an interaction (P < 0.001) between the allocation group and maternal prepregnant body mass index (BMI; in kg/m(2)) [birth-weight effect: -23, +34, and +96 g in lowest (<18.6), middle (18.6-21.8), and highest (>21.8) thirds of BMI, respectively]. In 1094 newborns whose mothers started supplementation > 90 d before pregnancy (per-protocol analysis), birth weight was higher in the treatment group (+48 g; 95 1, 96 g; P = 0.046). Again, the effect increased with maternal BMI (-8, +79, and +113 g; P-interaction = 0.001). There were similar results for LBW (intention-to-treat OR: 0.83; 95 0.66, 1.05; P = 0.10; per-protocol OR = 0.76; 95 0.59, 0.98; P = 0.03) but no effect on gestational age in either analysis.
CONCLUSIONS: A daily snack providing additional green leafy vegetables, fruit, and milk before conception and throughout pregnancy had no overall effect on birth weight. Per-protocol and subgroup analyses indicated a possible increase in birth weight if the mother was supplemented >3 mo before conception and was not underweight. This trial was registered at www.controlled-trials.com/isrctn/ as ISRCTN62811278
Original language | English |
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Pages (from-to) | 1257-1268 |
Number of pages | 12 |
Journal | American Journal of Clinical Nutrition |
Volume | 100 |
Issue number | 5 |
DOIs | |
Publication status | Published - 17 Sept 2014 |
Keywords
- pregnancy
- body mass index procedure
- diet
- birth weight
- fruit
- India
- low birth weight infant
- newborn
- micronutirients
- milk
- mothers
- prenatal nutrition
- per protocol analysis
- green leafy vegetables
- maternal nutrition
- snacks intention to treat analysis