DNA nutrition test

A new type of health test uses your DNA to give nutritional advice. But critics question whether it really works.  
Every time Rebecca Castle sat down to eat her favorite food, she says she suffered excruciating abdominal pain.
"Terrible, terrible, like, sharp shooting pain, bloating, distention," she explained.
That pain went on for more than two years. She saw severe doctors, then  took a DNA metabolic test.
 "I was allergic to starch. That's mostly root vegetables, corn, peas, sweet potatoes," Castle said.
 Ahmed El-Sohemy  is the chief science officer at Nutrigenomix .
 He said, "Individual genetic differences can help us understand why some people respond differently from others." 
El-Sohemy said, "The DNA test looks at 45 genetic markers and makes recommendations based on the patient's genetic profile  We're talking about metabolic tests. They're genetic tests, but they affect the way that you metabolize various substances that you consume," he continued.
However, physician and author Dr. David Agus said,  "DNA tests for diet and exercise just are not validated."
He said that few of the tests have data behind them.
He contends, "There are very few of them that actually have data behind them and  to me that's a problem. You know, you have companies like '23 and Me' that were taken off the market for several years because they had to show data with regard to human disease. Well, I think this same thing needs to happen with nutrition and exercise."   
Castle said the test produced more than 30 pages of results about her body.
"I think it's worth it. You don't need your blood taken, you're literally just spitting into a test tube. You could do it in your sleep," she said. 
Now, she can now avoid the foods shown by the test to irritate her stomach. 
The FDA says it supports tests that may provide consumers with direct genetic information that can inform decisions related to health, but it doesn't  actively regulate these products.

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