Do Candy, Cake and Other Sweets Cause Cancer?

You already know sugar can make you pack on the pounds, isn’t great for your skin and offers little in the way of nutritional value. But does it cause cancer?

We checked in with Jorge J. Nieva, MD, associate professor of clinical medicine at the Keck School of Medicine and a medical oncologist at the USC Norris Comprehensive Cancer Center of Keck Medicine of USC for the answer.

Does sugar cause cancer?

It’s not time to panic just yet, sugarholics. While Dr. Nieva decidedly does not give eating sugar a green light, he says that it’s a myth that eating too much will cause cancer.

Not only does it not cause cancer, some cancer patients also believe they must avoid carbohydrates to aid their treatment — which is also a myth. He explains, “Cancer is not affected by the sugar in your stomach; it’s touching the sugar that’s in your bloodstream.” For most of us, that amount doesn’t change, even if you binge on cupcakes, chocolate or jellybeans.

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“The amount of sugar that’s in your blood stream is tightly regulated by your pancreas and that stays in the range of about 80 to 120 milligrams per deciliter most of the time, regardless of what you eat,” he says.  So even if you do indulge in that piece of chocolate cake, your blood sugar levels won’t change dramatically. (One caveat: If you have diabetes, your diet does have a direct affect on your blood sugar levels, which is why regular monitoring is important.)

This belief is problematic because many cancer patients have trouble with too much weight loss, and they already don’t consume enough calories in their diet. It is dangerous for them if they restrict their diet, which will only make their weight loss, muscle atrophy and overall weakness worse.

But don’t break out the rainbow sprinkles…

Sugar isn’t off the hook completely. While eating more sugar in and of itself doesn’t cause cancer, eating too much of it can make you pack on the pounds. Being obese does increase your risk for certain cancers, including breast cancer, as does being diabetic, which is also more likely if you are overweight.

There is ample evidence that following a Mediterranean diet with plenty of whole grains, fruits and veggies and healthy fats can cut your cancer risk.

How can you cut your risk of cancer?

Many, but  not all cancers, are the result of lifestyle choices. The best way to reduce your risk of cancer and stay healthy overall is to not smoke, stay active and eat a healthy diet. Treatments are more effective the earlier the cancer is caught, so you should be proactive about getting appropriate screening tests for your age, gender and family history.

If you’re in the Southern California area and are in search of a cancer specialist, call (800) USC-CARE (800-872-2273) or visit to schedule an appointment.

By Anne Fritz