Sugar is just as addictive as heroin.

In 2009 author Dr. Robert Lustig claimed that sugar stimulates the brain’s reward system in the same way that tobacco, cocaine and even heroin does. However, his research was flawed. He cited a study that show parts of our brains that light up from a sugary snack are the same parts that light up for other fun activities like sex and drinking.

The problem is that scientists still don’t really know what addiction looks like in the brain, so the comparison isn’t accurate.