Maternal fat intake ( n = 25 ) might be associated with gestational weight gain as suggested by observational studies , although the direction of this association might depend on specific types of fat ( e.g. , saturated fat ) .
Macronutrient intake was not consistently associated with the prevalence of inadequate or excessive gestational weight gain .
CONCLUSIONS The current literature provides evidence that energy intake is associated with gestational weight gain , but the roles of individual macronutrients are inconsistent .
BACKGROUND  Abnormal gestational weight gain is associated with unfavorable pregnancy outcomes .
Several risk factors have been identified , but the effect of macronutrient intake during pregnancy on gestational weight gain has not been systematic ally evaluated in both high-income countries and low- and middle-income countries .
Dietary protein energy supplementation of pregnant Asian mothers at Sorrento, Birmingham. II: Selective during third trimester only.
Unselective dietary protein energy supplementation of Asian mothers at Sorrento Maternity Hospital did not enhance intrauterine growth . The effect of selective supplementation was therefore studied . Forty-five mothers who at 28 weeks were known to be nutritionally at risk ( triceps increment less than or equal to 20 microns/week between 18 and 28 weeks ) received one of three supplements during the third trimester : ( a ) vitamins only -- a multivitamin sachet daily containing vitamins A , B , C , and D ; ( b ) energy--42 - 125 MJ ( 10 000 - 30 000 kcal ) , all from carbohydrate , plus vitamins ; ( c ) protein energy -- energy and vitamins as before , but with 5 - 10 % of energy from milk protein .  Eighty-three mothers regarded as adequately nourished at 28 weeks also received one of the three supplements . In the nutritionally at-risk mothers the protein energy supplement was associated with a heavier crude birth weight and heavier weight for gestational age .  Supplementation did not lead to improved intrauterine growth in those mothers who were adequately nourished . The differential effect of supplementation depending on the mothers ' nutritional state during the second trimester may explain apparently conflicting results of other studies where some have shown a substantial effect of supplementation and others only a small effect . This effect of intervention is further evidence that " poor nutrition " contributes to poor intrauterine growth in selected mothers , even in developed countries
Maternal fat intake ( n = 25 ) might be associated with gestational weight gain as suggested by observational studies , although the direction of this association might depend on specific types of fat ( e.g. , saturated fat ) .
Macronutrient intake was not consistently associated with the prevalence of inadequate or excessive gestational weight gain .
CONCLUSIONS The current literature provides evidence that energy intake is associated with gestational weight gain , but the roles of individual macronutrients are inconsistent .
BACKGROUND  Abnormal gestational weight gain is associated with unfavorable pregnancy outcomes .
Several risk factors have been identified , but the effect of macronutrient intake during pregnancy on gestational weight gain has not been systematic ally evaluated in both high-income countries and low- and middle-income countries .