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Weaning involves a dietary switch in mammals, progressively decreasing the reliance on the consumption of a fat-rich milk diet in favour of a carbohydrate-rich diet. Metabolic adaptation to this shift in macronutrient consumption is characterized by reduced hepatic gluconeogenesis, increased liver glycogen content, and changes in lipid metabolism. Such metabolic changes are supported by various nutritional, hormonal, and neuronal factors. Dietary changes during weaning are shown to drive β-cell proliferation and maturation, which is important for the optimal endocrine function of the pancreas. A switch from the nutrient sensor target of rapamycin (mTORC1) to the energy sensor 5′-adenosine monophosphate-activated protein kinase (AMPK) was found critical for functional maturation of β-cells. Furthermore, changes in the macronutrient composition during the weaning process drive alterations in the gut microbiome, which is essential for the development of immune tolerance. The major calcium absorption pathway also changes during weaning, from the paracellular pathway during the suckling stage to the vitamin D dependent transcellular pathway post-weaning. However, the factors that regulate these post-weaning metabolic adaptations are not fully understood.

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