Omega-3 fortification.

Adding fish oil to commercial foods ranging from margarine to lunch meats could introduce more of these heart-healthy fats to Western diets, according to researchers at Royal Adelaide Hospital in Australia, reports Reuters Health.

A four-week study of 16 men found that foods rich in

Participants' menus included offerings of canola oil, flaxseed, and fresh and canned fish, all of which are naturally high in omega-3. Also offered were fish oil-enriched versions of foods that don't normally provide omega-3, including margarine, lunchmeat, sausage, French onion dip and shelf-stored milk.

According to the researchers, the margarine, cooking oil and flaxseed products were the biggest hits, with all participants eating them at some point during the study. After two weeks of the omega-3 rich diet, participants showed large increases of omega-3 fatty acids in their blood levels.