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 .
Differential oxidation of individual dietary fatty acids in humans.
BACKGROUND Dietary fatty acids that are more prone to oxidation than to storage may be less likely to lead to obesity . OBJECTIVE The aim of this study was to determine the effect of chain length , degree of unsaturation , and stereoisomeric effects of unsaturation on the oxidation of individual fatty acids in normal-weight men . DESIGN Fatty acid oxidation was examined in men consuming a weight-maintenance diet containing 40 % of energy as fat .  After consuming the diet for 1 wk , subjects were fed fatty acids labeled with (13)C in the methyl or carboxyl position ( 10 mg/kg body wt ) . The fatty acids fed in r and om order were laurate , palmitate , stearate , oleate , elai date ( the trans isomer of oleate ) , linoleate , and linolenate blended in a hot liquid meal . Breath sample s were collected for the next 9 h and the oxidation of each fatty acid was assessed by examining liberated (13)CO(2 ) in breath . RESULTS Cumulative oxidation over the 9-h test ranged from a high of 41 % of the dose for laurate to a low of 13 % of the dose for stearate . Of the 18-carbon fatty acids , linolenate was the most highly oxidized and linoleate appeared to be somewhat conserved . (13)C recovery in breath from the methyl-labeled fatty acids was approximately 30 % less than that from the carboxyl-labeled fatty acids . CONCLUSIONS In summary , lauric acid is highly oxidized , whereas the polyunsaturated and monounsaturated fatty acids are fairly well oxidized . Oxidation of the long-chain , saturated fatty acids decreases with increasing carbon number
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 .