In plain words
Gelatin is a protein made when from animal skin, bones, and connective tissue is cooked down. When it cools, it forms a gel. Many cooks know it from gelatin desserts. It is also the reason a good bone broth turns firm in the fridge. Gelatin is rich in and proline, two amino acids. Its protein is not complete in the way that meat or eggs are. Gelatin-rich broths appear in many food traditions, and people often discuss them in the context of pregnancy and postpartum eating. A mother might see gelatin on a package or in a recipe. It is also widely used in food manufacturing.
The deeper version
Gelatin is denatured collagen obtained by partial hydrolysis of collagen from skin, bone, and connective tissue. It is high in glycine, proline, and hydroxyproline, and it lacks tryptophan, so it is nutritionally incomplete as a protein source. Gelling depends on molecular weight and on collagen-like triple-helix reformation as the solution cools. In bone broth, gelatin supplies most of the protein and the gel, and contributes minerals in small amounts. A single small 2013 study raised concern about variable lead content in broth, and later analyses have not confirmed a hazard at typical intake. Evidence for specific benefits of collagen-rich broths rests on small trials and mechanistic reasoning. Whether those benefits go beyond the protein itself remains an open question.
Where it comes up
- Bone brothNourishment and Traditions
- Traditional pregnancy foods across culturesPregnancy: Eating
- Protein: how much and from wherePregnancy: Eating
What mothers here say about gelatin
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Sources
- USDA Agricultural Research Service — FoodData Central: nutrient profiles for gelatin and bone broth entries