The Science Behind Jell-O's Ingredients and Nutritional Value.

TL;DR
Gelatin dessert, commonly known as Jell-O, is made by mixing powdered gelatin with hot water, sweeteners, flavorings, and sometimes fruit or other ingredients. Gelatin, the primary ingredient in Jell-O, is derived from collagen, a protein found in the connective tissues, bones, and skin of animals. It is not considered a nutritious food on its own since it doesn't provide significant amounts of vitamins or minerals, but it is low in calories and fat and doesn't contain cholesterol. Hospitals serve Jell-O because it's easy to swallow and digest, provides hydration, and can be used to create coatings for pills or capsules.
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