An average adult needs about 50 g of protein per day, according to the Centers for Disease Control. Gastric bypass patients, however, need 60 to 80 g of protein per day because of rapid weight loss, according to Linda Aills, R.D., lead researcher of an article published in the September 2008 issue of "Surgery for Obesity and Related Diseases." The right protein supplement may help meet your increased need for this nutrient.
Complete Proteins
When selecting a protein supplement after gastric bypass surgery, first consider whether it provides complete or incomplete protein, recommends Aills. To build protein, humans need nine essential amino acids from food sources in addition to the amino acids manufactured in the body. Complete protein supplements contain all of the essential amino acids, whereas incomplete proteins contain fewer than nine. Choosing a complete protein supplement, including those made from whey, casein, soy or egg whites, prevents the body from losing lean muscle mass during rapid weight loss. Whey supplements provide the highest quality of protein, says Aills, but consider other factors before making your selection. If you have lactose intolerance, for example, choose lactose-free whey protein isolates, soy or egg white supplements rather than whey protein concentrate, which contains lactose. Look for a supplement that provides at least 15 g of protein per serving and no more than 5 g of sugar or fat, according to the Highland Hospital Bariatric Surgery Center. Sample a variety of flavored and unflavored supplements in powder and ready-to-drink forms, as tastes vary widely, and consider price and convenience as well.
Incomplete Proteins
An incomplete protein lacks at least one essential amino acid and, therefore, does not prevent the loss of lean muscle mass during weight loss. Incomplete protein supplements include collagen-based protein made from kelp or soy and those labeled as amino acid doses, according to Aills. Although incomplete protein supplements might cost less than complete protein supplements, they should not be your only source of protein unless your nutritionist or bariatric surgeon approves. Failing to consume adequate high-quality protein after gastric bypass surgery may result in hair loss and muscle wasting.
Mixed Proteins
A hybrid or mixed protein supplement combines a large dose of one or more amino acids with a complete or incomplete protein supplement. Manufacturers often blend several protein sources -- whey, soy, casein or collagen -- to improve the flavor and texture of protein bars and ready-to-drink protein beverages, says Aills. The nutritional value of these mixed products varies widely, depending on the source of protein and any added ingredients such as nuts, dried fruit, sugar and fats. Read labels carefully to ensure that the product contains a complete protein source, at least 15 g of protein per serving and no more than 5 g each of sugar and fat. If in doubt about a particular product, consult your nutritionist or bariatric surgeon for advice.
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