I do think some people can become addicted to sugar. I am sure my mother is addicted. The other day she had an enormous slice of roulade for her afternoon tea, a huge slice of pavlova for dessert after her dinner just a couple of hours later, and immediately after dinner, I found her in the kitchen eating handfuls of sugary breakfast cereal straight out of the packet. And she had a bar of chocolate later that night. Today she has eaten 3 apple pies and 2 packets of crisps for lunch...before going out for afternoon tea with her sister, when I know she will eat cake.
I've tried encouraging her to cut down, but she denies she has a problem. What I see her eat is only a small fraction of what she probably puts away - she will stuff herself in private and hide the sweet wrappers. Last week she went into the kitchen to 'make some tea' and when I came out a few minutes later, she was stuffing an entire mars bar into her mouth in one go, and another empty wrapper on the counter, so it was obviously the second one. Really hard to know what to do, as I am cooking her healthy meals, but she eats those and then goes overboard on the junk afterward.