Soy lecithin refers to a mixture of phospholipids, or fat derivatives. It is an oily substance, which is a byproduct of soybean oil production. You can find lecithin naturally in other food sources, including egg yolks, wheat germ and legumes. Soy lecithin is used extensively in the food manufacturing industry because as an emulsifier in everything from butter to mayonnaise. Though soy lecithin has health benefits, it is not an essential nutrient.
Process
To produce and extract lecithin, soybeans are tempered by keeping them at a consistent moisture and temperature level for seven to 10 days. This hydrates the soybeans and loosens the hull. When they are ready, the soybeans are cleaned and cracked into small pieces, then the hulls are removed. Next, the soybeans are heated and pressed into flakes. Soybean oil is extracted from the flakes, then lecithin is extracted from the oil.
Provides Choline
Soy lecithin is rich in choline, a nutrient important to brain function. Choline is needed for proper memory, movement, sleep and learning. Choline levels decline with age and are associated with reduced memory and cognitive function the elderly. Choline is also helpful to cardiovascular function. According to the Linus Pauling Institute, It helps convert homocysteine to methionine. Homocysteine is a normally harmless amino acid, but elevated levels increase your risk for cardiovascular disease. Methionine is an amino acid that acts as an antioxidant, protecting your cells from oxidative stress by binding to free radicals.
Lowers Cholesterol
Your liver produces cholesterol and you get it from your diet. It is needed for your body to function, however, excess cholesterol contributes to weight gain and heart disease. Soy lecithin may help reduce cholesterol. According to a study published in the September, 1998 journal "Atherosclerosis," soy lecithin demonstrated cholesterol lowering effects in monkeys and hamsters given soy lecithin for eight weeks.
Unverified Benefits
Though clinical studies are lacking, according to the United Soybean Board, scientists believe soy lecithin can help improve liver function, athletic performance, reproduction and fetal development. Most lecithin supplements marketed in the United States is derived from soy. Though soy lecithin is considered a natural supplement, it is important to consult your doctor before taking it.
References
- United Soybean Board: Soy Lecithin Fact Sheet
- "Atherosclerosis"; Soy Lecithin Reduces Plasma Lipoprotein Cholesterol and Early Atherogenesis in Hypercholesterolemic Monkeys and Hamsters: Beyond Linoleate; T.A Wilson et al.; September 1998
- Oregon State University -- Linus Pauling Institute: Choline; Jane Higdon; November 2003



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