Gut loading
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Gut loading is the process by which an animal's prey is raised and fed nutritious foods with the intention of passing those nutrients to the animal when the prey is eaten. For example, crickets bred for frog food are often dusted with calcium or other nutrients, including fat and protein, so as to supplement the frog's diet.
Several commercial products are available and are fortified specifically for gut loading. These products often include varying combinations of fat, protein, vitamins, and dietary fiber.