Move over, apples—new research shows that eating one avocado daily can help keep "bad" cholesterol in check. Researchers define "bad" cholesterol as oxidized low-density lipoprotein (LDL) and small, dense LDL particles. In a randomized, controlled nutrition study involving overweight or obese adults, daily avocado consumption was linked to lower levels of LDL—especially small, dense LDL particles—and oxidized LDL.
"We showed that including one avocado a day reduced small, dense LDL particles," explained the lead researcher. These particles are particularly dangerous, as they promote plaque buildup in arteries. "Add avocados to your diet thoughtfully, like on whole wheat toast or as a vegetarian dip," she advised.
The study specifically highlighted avocados' role in reducing oxidized LDL particles. Just as oxygen browns a sliced apple, oxidation harms the body, too.
"Extensive research links oxidation to cancer and heart disease," the researcher noted. "Oxidized LDL triggers atherosclerosis—the plaque buildup in artery walls. Antioxidant-rich foods like avocados offer real protection."
The study included 45 overweight or obese adults. All started with a two-week "walk-in" diet mimicking average American eating habits for a level baseline.
Participants then followed five-week randomized diets: low-fat, moderate-fat, and moderate-fat with one daily avocado. The non-avocado moderate-fat diet matched the monounsaturated fats from avocados.
After the avocado diet, oxidized LDL levels dropped significantly compared to baseline or other diets. Lutein, a key antioxidant, also rose. Notably, oxidized small, dense LDL particles decreased.
