- With Mayo Clinic nutritionist
Katherine Zeratsky, R.D., L.D.read biographyclose window
Katherine Zeratsky, R.D., L.D.Katherine Zeratsky, R.D., L.D.
As a specialty editor for the nutrition and healthy eating guide, 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, Katherine 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 wellness nutrition at Mayo Clinic in Rochester, Minn., and nutrition education related to weight management and practical applications of nutrition-related lifestyle changes.
Other areas of interest include food and nutrition for all life stages, active lifestyles and the culinary arts.
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.
Weight loss basics (6)
- Fast weight loss: What's wrong with it?
- Slow metabolism: Is it to blame for weight gain?
- Breakfast: Why is it so important to weight control?
- see all in Weight loss basics
Diet plans (10)
- Dieting? Beware of liquid calories
- The Cookie Diet: Can it help you lose weight?
- The Special K diet: Helpful for weight loss?
- see all in Diet plans
Mayo Clinic diet (1)
- Weight loss: Better to cut calories or exercise more?
Diet and exercise (4)
- Can I use yoga for weight loss?
- Negative calorie foods: Diet gimmick or weight-loss aid?
- Walking: Is it enough for weight loss?
- see all in Diet and exercise
Diet pills, supplements and surgery (13)
- Ear stapling for weight loss: Does it work?
- Lipovarin: An effective weight-loss supplement?
- Coconut oil and weight loss: Does it work?
- see all in Diet pills, supplements and surgery
Mayo Clinic Health Manager
Get free personalized health guidance for you and your family.Get Started
Blood type diet: What is it? Does it work?
What is the blood type diet? And is there any merit to the blood type diet?
from Katherine Zeratsky, R.D., L.D.
There's no sound scientific evidence that the so-called blood type diet is any more effective or any more beneficial for weight loss than is any other diet.
The blood type diet, sometimes called the biotype diet, is based on the idea that your blood type — A, B, AB or O — should determine your diet, your exercise regimen and your medical choices. While there's some controversy even among proponents of the blood type diet, in general they say that food proteins called lectins are digested differently based on your blood type. If you eat food that's not compatible with your blood type, you may experience a host of health problems, including slow metabolism, allergies, asthma, cancer, heart disease and chronic fatigue.
On the other hand, proponents say, if you follow a diet that's tailored to your specific blood type, it will help you lose weight, improve chronic health conditions and help prevent certain diseases. For instance, a blood type diet may suggest that if you have type A blood, you should focus on a vegetarian diet with fresh, organic foods and that you should engage in calming exercises, such as yoga and tai chi, to help avoid the conditions you're more susceptible to, including cancer, heart disease and diabetes.
But there's no solid research evidence to support claims about a blood type diet. If you're trying to lose weight, focus on developing healthy eating and exercise habits that you can follow for a lifetime.Next question
Flat Belly Diet: Can it help you lose weight?
- Nelson JK (expert opinion). Mayo Clinic, Rochester, Minn. June 15, 2010.
- Eat Right for Your Type. http://www.dadamo.com/. Accessed June 14, 2010.
- Power L. Biotype Diets System: Blood types and food allergies. Journal of Nutritional & Environmental Medicine. 2007;16:125.
- Bauer BA (expert review). Mayo Clinic, Rochester, Minn. June 14, 2010.