You'd never willingly eat poison, right? Okay, maybe you snack on not-so-healthy treats every so often. Or scarf down non-nutritious junk at happy hour. But straight-up poison? Never.

Or so you think.

"Sugar can act like poison in high doses—and the amount in our diets has gone beyond toxic," says Robert Lustig, M.D., a neuroendocrinologist at the University of California at San Francisco School of Medicine. The typical American now swallows the equivalent of 22 sugar cubes every 24 hours. That means the average woman eats 70 pounds—nearly half her weight—of straight sugar every year.

Both the American Heart Association and the World Health Organization recently released guidelines urging most women to stay under six teaspoons (i.e., six sugar cubes) of added sugar per day. "Sugar consumption is now an epidemic," says Mark Hyman, M.D., author of The Blood Sugar Solution 10-Day Detox Diet. "The long-term effects will be staggering."

And, no, we're not just talking cavities. When eaten in such vast quantities,sugar can wreak havoc on the body. Over time, that havoc can lead to diabetes and obesity, and also Alzheimer's disease and breast, endometrial, and colon cancers. One new study found that normal-weight people who loaded up on sugar doubled their risk of dying from heart disease. Other research pinpoints excess sugar as a major cause of nonalcoholic fatty liver disease, which can lead to liver failure.

No doubt about it, says Hyman: We're sweetening ourselves sick, yet screaming for more. Why? Because we're seriously hooked. Research shows that hyper-sweet foods may be as addictive as the hardest-to-quit drugs.

Our earliest ancestors likely downed about 20 teaspoons of sugar...peryear, says Hyman. The body made its own glucose—an ingredient in sugar and the "energy of life" that powers your every cell—by breaking down healthy fats, proteins, and complex carbs, says Lustig. When people came across something sweet, their brains rejoiced, since sweet meant nutritious berries or fruits, says Ashley Gearhardt, Ph.D., a psychologist at the University of Michigan.

Problem is, research suggests that your brain still gets psyched by sweets—like, totally psyched. Bingeing on them in the modern form of added sugar can cause a surge of dopamine, the feel-good neurotransmitter, in your brain's reward center. Repeated spikes can desensitize that center, which could release less and less dopamine, leaving you needing more and more sugar to score a rush, says Nicole Avena, Ph.D., author of Why Diets Fail: Because You're Addicted to Sugar. "These are the same brain patterns you see during drug addiction."

Indeed, a recent study suggests that sugary cookies could be as addictive as cocaine or morphine. When scientists scanned the brains of subjects who'd just eaten a high-sugar treat, everyone's nucleus accumbens—the part of the brain that switches on when a person shoots heroin or smokes crack—was lit up like fireworks. By contrast, the control group that swallowed low-sugar fare had no nucleus accumbens activity.

That's not all: Avena's research shows that, for some, sugar dependence could come with withdrawal symptoms like those of a street drug addiction. "We see brain changes that lead to lethargy, anxiety, and irritability," she says. "And also changes that produce fierce cravings." Not helping matters are your taste buds, which suffer from their own sort of addiction: New research suggests that the more you weigh—and the more sugar you eat, the more you're likely to weigh—the duller your "sweet" taste buds can become, meaning you may have to shovel in even more sugar to get the same sensory satisfaction.

In other words, millions are now strung out on a substance as dangerous as it is ubiquitous, says Hyman. "What saved us as hunters and gatherers—that survival mechanism that rewarded us when we sought sweets—is now killing us."

Read the full article "Sugar is Killing Us. Here's Everything You Need to Know" at Women's Health.