Feeding status affects in vivo prosucrase-isomaltase processing in rat jejunum

Article Abstract:

The degree of prosucrase-isomaltase (pro-SI) conversion to sucrase was investigated through constant administration of labeled leucine in feeding and fasting rats. The rate of pro-SI conversion was calculated. Results showed that isotopic equilibrium between the amino acid pool and pro-SI was considerably influenced by nutritional status. Conversion of pro-SI to sucrase was also enhanced in fed animals. It was concluded that the amino acid pool of pro-SI synthesis was not the mucosal free amino acid and that enzyme conversion rate was dependent on feeding.

Enzymes, Enzyme regulation, Post-translational modification

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Requirements for what? Is the measurement of energy expenditure a sufficient estimate of energy needs?

Article Abstract:

The accumulation of free-living energy expenditure data is vital to the identification of the energy requirements of populations and specific subgroups. Energy expenditure measurements should involve socioeconomic and other nutritional factors of various groups of humans to avoid false estimates. Research in developed countries indicate that food availability is not measured through economic constraints and that energy expenditures are often underreported.

Health aspects, Industrialized countries, Energy metabolism, Bioenergetics, Industrial nations

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