Alginic acid is a type of carbohydrate found in the cell wall of brown algae. The compound effectively absorbs large amounts of water, forming a viscous fluid. Alginic acid occurs in some types of food naturally, or is extracted from the cells and used as a thickening agent in a number of processed foods.
Seaweed
Brown seaweed, a marine plant, contains alginic acid. The seaweed is made up of brown algae cells, and each cell's wall provides a source of the acid. According to Sonoma State Univeristy, brown seaweed can come in the form of a marine kelp, called "feather boa," or as a form of rockweed that grows near the shore. The seaweed is sold in health food or specialty stores, often as dried sheets or cut pieces. You can introduce brown seaweed into your diet as an additive to soups or casseroles.
Processed Cheese
Some processed foods also contain alginic acid, since its viscous consistency can act as a thickener, bulking agent, or emulsifier, according to the World Heath Organization. Alginic acid is typically found in processed cheese, which can include cheese spreads, canned cheese products, cheese sauces or cheese slices.
Frozen Desserts
Many frozen desserts also contain alginic acid. This can include frozen dairy products like ice cream or frozen yogurt, as well as icy desserts like sherbets and sorbets, reports the World Health Organization. In addition to their alginic acid content, these desserts are also typically high in simple sugars. While these treats have their place in a balanced diet, when consumed in moderation, excessive sugar consumption can have a number of negative health effects, including an increased risk of obesity and type II diabetes.
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