Our purpose was to conduct a new analysis to update and extend previously published trends of fructose availability and estimated fructose intake and food sources of dietary fructose from the 1977-1978 Nationwide Food Consumption Survey (NFCS) data. We estimated fructose usual intake with data from NHANES 1999-2004 for 25,165 individuals (1 y and older, excluding pregnant and lactating women and breast-fed infants) using the Iowa State C-SIDE software. We applied food group-specific conversion factors to individual measures of sugar intakes following the earlier study. Sweetener availability in the United States increased from 1978, peaked in 1999, and declined through 2005. The high-fructose corn syrup percentage of sweeteners increased from 16% in 1978 to 42% in 1998 and then stabilized. Since 1978, mean daily intakes of added and total fructose increased in all gender and age groups, whereas naturally occurring (N) fructose intake decreased or remained constant. Total fructose intake as percentage of energy and as percentage of carbohydrate increased 1 and 1.2%, whereas daily energy and carbohydrate intakes increased 18 and 41%, respectively. Similar to 1978 results, nonalcoholic beverages and grain products were the principal food sources of added fructose. Fruits and fruit products were the main dietary sources of N fructose in 2004; in 1978, grain products and vegetables were more predominant food sources. Although comparison of estimates of fructose intakes between data from the 1977-1978 NFCS and the NHANES 1999-2004 showed an increase, this increase was dwarfed by greater increases in total daily energy and carbohydrate intakes.
Previous research suggests that restricting the availability of abortion reduces average birth weight. In this paper we use data from the National Longitudinal Survey of Youth to reexamine this question. Most previous studies have estimated the probability that a pregnancy is carried to term, and then used these estimates to calculate "selection corrections" that are included in models of birth weight. We focus instead on reduced form models of birth weight that are not affected by under-reporting of abortion, and that do not involve strong identifying restrictions. We also explore the potential endogeneity of abortion laws by comparing jurisdictions with abortion restrictions to jurisdictions where restrictive laws have been passed but are enjoined by the courts. Our results provide little support for the hypothesis that restrictions reduce average birth weight. We also find some evidence that abortion restrictions are endogenous, and that estimated effects on birth weight may reflect unobserved characteristics of states.
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