These folks are deficient in the lactase enzyme that's needed to break down this milk sugar, causing gas, bloating, and diarrhea after consuming some forms of dairy products. The solution is to purchase products with the lactose already broken down, to take the enzyme in the form of a pill or drops, or to find a substitute for these foods. Soymilk is not technically a milk, but a beverage made from soybeans. It is the liquid that remains after soybeans are soaked, finely ground, and then strained. Since it doesn't contain any lactose, soymilk is suitable for lactose intolerant folks.
Soy foods are the only plant-based complete proteins.
Since many people substitute soy beverages for cow's milk, manufacturers have offered fortified versions. If you choose soymilk, read labels carefully to be sure you're getting enough of these important nutrients. Soymilk may help some people reduce their risk for heart disease. The recommendation is to take in about 25 grams of soy protein per day. One cup of soymilk has about 7 - 10 grams of protein, depending on the brand.