Thursday, February 12, 2009
Your Genes Remember a Sugar Hit
Human genes remember a sugar hit for two weeks. What’s more, prolonged poor eating habits could be capable of permanently altering your DNA.
A team studying the impact of diet on heart tissue found that cells showed the effects of a single sugar hit for 14 days. The cells switched off genetic controls designed to protect the body against diabetes and heart disease.
Regular poor eating could amplify the effect, with genetic damage lasting months or years, and potentially passing through bloodlines.
Journal of Experimental Medicine September 2008, 29;205(10):2409-17
Tehran Times January 18, 2009
Dr. Mercola's Comments:
This finding lends even more credence to the phrase “you are what you eat.” When you eat sugar, not only do your genes turn off controls designed to protect you from heart disease and diabetes, but the impact lasts for two weeks!
Even more concerning, if you eat poorly for a long time, your DNA may become permanently altered, and the effects could be passed on to your children and grandchildren.
While you may not feel the effects of a poor diet immediately, in time health problems like diabetes, heart disease and others begin to surface.
What this all points to is even more support for the emerging field of epigenetics, which is the study of how environmental factors like diet, stress and maternal nutrition can change gene function without altering the DNA sequence in any way.
In other words, you are born with a set of genes, but the expression of those genes is not set in stone. Your genes can be either activated or silenced by various factors including your diet and even your mind. It is not your genes that dictate your future health, but rather the expression of those genes that matter.
So in the case of eating sugar, it’s now known that this switches off good genes that protect your body from disease. This is just one of many reasons why you may want to seriously limit or eliminate sugar from your diet.
Is There a Good Diet for Your Genes?
Your genes are merely storage facilities; they have no intelligence. As I said earlier, what’s important is the expression of your genes, and your diet can certainly influence that.
Scientists are now uncovering that the reason why certain foods fight cancer or other disease is because of their impact on gene expression.
For instance, a substance called isothiocyanate in broccoli sparks hundreds of genetic changes, activating some genes that fight cancer and switching off others that fuel tumors.
Freeze-dried black raspberries also show promise. In an animal study, researchers used a carcinogen to alter the activity of 2,200 genes. However, 460 of those genes were restored to normal activity in animals that consumed freeze-dried black raspberry powder.
So it is very clear that just as a bad diet can lead to negative changes in your genes, a good diet can lead to positive ones. As Associate Professor Assam El-Osta, from the Baker IDI Heart and Diabetes Institute team who led the above study on sugar, said in the Herald Sun:
"This is not all doom and gloom . . . we think there is good epigenetic memory as well for individuals who have a good diet, not only for themselves but potentially for future generations.
If you have had five years of bad control, where good genes are switched off and bad genes switched on, changing that for a couple of months to a good diet may not have a tremendous impact.
But going back to a good diet would have some effect 10 years later. Dieting doesn't work because what you ate two months or two years ago is going to be reflected now."
The bottom line?
Eating healthy should not be just a fad or a phase in your life -- it should be an essential part of your lifestyle. And by eating well, you are helping your genes to express themselves in a positive, disease-fighting way.
For those of you who aren’t “perfect” eaters, there’s good news too. If you switch to a healthy diet now, it can have a positive impact on your health down the road.