A small daily handful of olives delivers many of the same building blocks that researchers connect to a healthier heart in olive oil studies.
That means monounsaturated oleic acid, plant polyphenols, and vitamin E. About ten olives contain roughly 50 calories, along with about 1.5 grams of fiber per half cup, according to Cleveland Clinic dietitian Devon Peart.
The strongest heart-disease numbers, though, still come from olive oil itself.
A cohort study of nearly 100,000 US adults, presented at the American Heart Association's EPI|LIFESTYLE 2020 Scientific Sessions, found that people who consumed more than half a tablespoon of olive oil a day had a 15% lower risk of any cardiovascular disease and a 21% lower risk of coronary heart disease than those who rarely or never used it.
Also read: How peanut butter affects your blood sugar
Our earlier coverage of that same half-a-tablespoon threshold walks through the practical serving in more detail.
What polyphenols may do to your LDL
The most concrete cholesterol effect is on LDL oxidation. Oxidized LDL, meaning LDL particles that have reacted with oxygen and free radicals, is a key trigger for the plaques that narrow arteries.
The European Food Safety Authority accepted a health claim that olive oil polyphenols help protect blood lipids from oxidative stress, for products carrying at least 5 mg of hydroxytyrosol and its derivatives per 20 g of oil.
Whole olives contain the parent polyphenol oleuropein, which converts into hydroxytyrosol during ripening.
Also read: How many pull-ups should you be able to do? Standards sorted by age and sex
That overlap is why cardiology guidance and dietitians treat olives and olive oil as members of the same food family, even if the trials were designed around the oil.
A crossover clinical trial published in the European Journal of Nutrition tested 45 grams of olive pomace oil per day against high-oleic sunflower oil in 64 volunteers, including 30 adults at increased cardiovascular risk. After four weeks, LDL cholesterol dropped by 4.3% in the at-risk group and the LDL-to-HDL ratio also improved.
Where the blood pressure evidence stops
The same crossover trial found no significant changes in systolic or diastolic blood pressure after either oil.
Blood-pressure benefits from olives specifically remain the weakest link, and the large US cohort figures were built around cardiovascular events overall, not blood-pressure targets.
Also read: How eating mango every day can affect your gut, blood sugar and immunity
If you are managing hypertension, the more urgent number on the olive jar is sodium.
Standard cured olives sit in a brine of water and salt, and Cleveland Clinic advises people with hypertension to pick a lower-sodium variety or rinse the olives before eating them.
How to fit them into your day
If you eat olives to nudge your diet in a Mediterranean direction, the practical serving Cleveland Clinic points to is a quarter-cup portion, roughly a handful.
For the polyphenol effect specifically documented by EFSA, virgin olive oil at that 5 mg per 20 g threshold is the more reliable delivery vehicle, because polyphenol content in whole olives varies with variety, ripeness, and curing method.
Also read: These health conditions can cause night sweats
People taking blood-thinning or blood-pressure medication, or anyone with a known salt-sensitive condition, should talk with a doctor before turning a daily olive habit into part of a treatment plan.
Also read: What you eat every day may be shaping your depression risk through your gut
This article is made and published by Mie Hermansen, who may have used AI in the preparation.