- With Mayo Clinic nutritionist
Katherine Zeratsky, R.D., L.D.
read biographyclose windowBiography of
Katherine Zeratsky, R.D., L.D.
Katherine Zeratsky, R.D., L.D.
As a specialty editor for the Food & Nutrition Center, Katherine Zeratsky helps you sort through the facts and figures, the fads and the hype to learn more about nutrition and diet.
A Marinette, Wis., native, she is certified in dietetics by the state of Minnesota and the American Dietetic Association. She has been with Mayo Clinic since 1999.
She is active in nutrition-related curriculum and course development in pediatrics at Mayo Clinic Rochester and nutrition education related to the physiology and recommended intakes for premature infants.
Other areas of interest include breast milk and formula safety, neonatal feeding, and nutrition for breast-feeding mothers.
She graduated from the University of Wisconsin-Madison, served a dietetic internship at the University of Iowa Hospitals and Clinics, and worked as a registered dietitian and health risk counselor at ThedaCare of Appleton, Wis., before joining the Mayo Clinic staff.
More answers
- Food poisoning: How long can you safely keep leftovers?
- Water softeners: How much sodium do they add?
- Fiber supplements: Are they safe to take every day?
- Fat grams, calories or percentages: Which are more important?
- Moldy cheese: Is it unsafe to eat?
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- Vitamin D: How much is too much?
- Calcium supplements: Do men need them too?
- What is BPA? Should I be worried about it?
- Calcium supplements: Which type is best?
- Thanksgiving turkey: Can you cook it frozen?
- High-fructose corn syrup: What are the concerns?
- Diverticulitis diet: Can certain foods trigger an attack?
- Vitamin D: How much do I need?
- Multivitamins: Do young children need them?
- Buying beef? A guide to choosing the leanest cuts
- Calcium supplements: Should they be taken with meals?
- Low-sodium diet: Why is processed food so salty?
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- Calories in sushi: What are the low-cal options?
- Vegetable juice: As good as whole vegetables?
- Butter vs. margarine: Which is better for my heart?
- Acai berry products: What are the health benefits?
- Percent Daily Value: What does it mean?
- Coffee and health: What does the research say?
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- Freezing meat: Does it kill harmful bacteria?
- Chocolate: Does it impair calcium absorption?
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- Dietary supplements vs. food: Which is better?
- E. coli: How can I tell if food is contaminated?
- Roasting nuts: Lower fat by roasting in the shell?
- Yerba mate: Is it safe to drink?
- Water after meals: Does it disturb digestion?
- Ground flaxseed: Better than whole?
- Diverticulitis diet: Should I avoid nuts and seeds?
- Monosodium glutamate (MSG): Is it harmful?
- Canned pumpkin: Better than fresh?
- Smart Balance: Are cholesterol-lowering products safe for everyone?
- Vitamin water: Better than plain water?
- Diet soda: Is it bad for you?
- Microwave popcorn: Is it linked to lung disease?
- Too skinny? How to add pounds safely
- Sea salt vs. table salt: Which is better?
- Caffeine: Is it dehydrating or not?
- Prenatal vitamins: OK for women who aren't pregnant?
- Grape juice: Same heart benefits as wine?
- Diverticulitis diet: What should I eat after an attack?
- Lentils: How do I cook with them?
- see all
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Question
Olive oil: What are the health benefits?
What are the health benefits of olive oil? Is extra-virgin oil better than regular olive oil?
Answer
from Katherine Zeratsky, R.D., L.D.
When choosing fats, olive oil is a healthy choice. Olive oil contains monounsaturated fat, a healthier type of fat that can lower your risk of heart disease by reducing the total and low-density lipoprotein (LDL, or "bad") cholesterol levels in your blood.
In contrast, saturated and trans fats — such as butter, animal fats, tropical oils and partially hydrogenated oils — increase your risk of heart disease by increasing your total and LDL cholesterol levels.
According to the Food and Drug Administration (FDA), consuming about 2 tablespoons (23 grams) of olive oil a day may reduce your risk of heart disease. You can get the most benefit by substituting olive oil for saturated fats rather than just adding more olive oil to your diet.
All types of olive oil contain monounsaturated fat, but "extra-virgin" or "virgin" olive oils are the least processed forms, so they're the most heart healthy. Those types contain the highest levels of polyphenols, a powerful antioxidant that also can promote heart health.
Next questionFood poisoning: How long can you safely keep leftovers?
- Covas MI, et al. The effect of polyphenols in olive oil on heart disease risk factors. Annals of Internal Medicine. 2006;145:333.
- Fito M, et al. Anti-inflammatory effect of virgin olive oil in stable coronary disease patients: A randomized, crossover, controlled trial. European Journal of Clinical Nutrition. 2008;62:570.
- FDA allows qualified health claim to decrease risk of coronary heart disease. U.S. Food and Drug Administration. http://www.fda.gov/bbs/topics/news/2004/new01129.html. Accessed Feb. 13, 2009.
- Visioli F, et al. Biological properties of olive oil phytochemicals. Critical Reviews in Food Science and Nutrition. 2002;42:209.
