- With Mayo Clinic nutritionist
Katherine Zeratsky, R.D., L.D.
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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.
Nutrition basics (20)
- Water softeners: How much sodium do they add?
- Caffeine: Is it dehydrating or not?
- Coffee and health: What does the research say?
- see all in Nutrition basics
Healthy diets (8)
- Diverticulitis diet: Can certain foods trigger an attack?
- Butter vs. margarine: Which is better for my heart?
- Canola oil: Does it contain toxins?
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Healthy cooking (10)
- Lentils: How do I cook with them?
- Food poisoning: How long can you safely keep leftovers?
- Canned pumpkin: Better than fresh?
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Healthy menus and shopping strategies (6)
- Calories in sushi: What are the low-cal options?
- Vegetable juice: As good as whole vegetables?
- Buying beef? A guide to choosing the leanest cuts
- see all in Healthy menus and shopping strategies
Nutritional supplements (15)
- Vitamin water: Better than plain water?
- Ground flaxseed: Better than whole?
- Vitamin C: Can too much be harmful?
- see all in Nutritional supplements
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Question
Fat grams, calories or percentages: Which are more important?
When assessing the fat content of foods, which should I focus on — fat grams, calories or percentages?
Answer
from Katherine Zeratsky, R.D., L.D.
All three are intended to help you understand the fat content of foods. However, looking at fat grams is probably the most useful way to monitor how much fat you're getting in your daily diet.
Health experts at the Institute of Medicine recommend that healthy adults get 20 to 35 percent of their total calories from fat. Each gram of fat has 9 calories. So, if you're trying to eat 1,800 calories a day, you should have no more than 70 grams of fat a day — 35 percent of 1,800 calories = 630 calories, divided by 9 (calories per gram of fat) = 70 grams.
Food labels also list calories and calories from fat per serving. So if a food label says 250 calories and 110 fat calories, it means that almost half the food's calories come from fat. That's not necessarily a reason to avoid that food, though. For example, 55 percent of the calories in part-skim mozzarella cheese come from fat, but a 1-ounce serving (28.47 grams) has just 4 grams of fat and 72 total calories.
The percentages you see on food labels are designed to show how much of a specific nutrient a food contains compared with the Daily Value (DV). The DV is based on a 2,000-calorie diet. So, for example, if the label lists 18 percent next to fat it means that the food provides 18 percent of the suggested daily total for fat. You may be eating more or less than 2,000 calories a day, but this percentage can still help you choose foods that are lower in fat.
Next questionOlive oil: What are the health benefits?
- Dietary reference intakes for energy, carbohydrate, fiber, fat, fatty acids, cholesterol, protein, and amino acids. Institute of Medicine, 2005. http://www.iom.edu/Object.File/Master/54/397/DRIs.Macronutrients.pdf. Accessed Jan. 20, 2009.
- The nutrition facts label: An overview. U.S. Food and Drug Administration, 2004. http://www.cfsan.fda.gov/~dms/foodlab.html#twoparts. Accessed Jan. 20, 2009.
