Zinc Deficiency

The objective of the current study is to test the overarching hypothesis that the beef nutritive matrix is uniquely suited to direct dietary zinc to cellular compartments for improved metabolic function, leading to a greater effect on health outcomes. Specifically, whether beef, as a component of a healthy meal, will promote the absorption of zinc into cells, where the zinc will have greater effects on zinc-dependent metabolic processes supporting cardiovascular health. To maximize the observability of these beef-related effects, individuals who are 55- to 70-year-old who generally have a higher risk of zinc deficiency and cardiovascular disease will be enrolled.

The goal of this randomized clinical trial is to compare the effect of higher (10 mg per day) versus standard (1 mg per day) doses of zinc supplementation The main questions it aims to answer are: * Growth velocities and delta z-scores during the date of start intervention until the end of the time interval (at least 2 weeks of intervention on date of 44 weeks of postmenstrual age or discharge whichever came first) in very preterm infants with a birthweight less than1800 grams. * Growth and neurodevelopment at 24 months postnatal age