You’re straw manning me. I’m not saying people don’t have a choice. But they’re still going to lose. It doesn’t matter that I have a choice of which piece to move when the point is not to move pieces, but to checkmate. Saying there are choices misses the point.
Information: does an individual know chess rules? Openings? En passant? Do they want to spend the time and effort to learn? Are they getting their info from reliable sources or are they learning bongcloud and knooks?
Difference in skill level: the food and diet industries have thousands of specialists on their side with experience in psychology, advertisement, economics, lobbying, etc. Grandmasters can set up traps that new like a good idea to their opponent while thinking 10 steps ahead.
Complexity: chess and diet are not a single choice, but a series of choices, some of which make later moves more difficult.
Effort: it takes a long time to learn enough to even put up a decent resistance to a grandmaster, let alone win. It’s more than I’d care to put in. I don’t want to think about chess all the time. That’s called a chessing disorder.
Just on your last point, sugar is not more addictive than narcotics. That’s complete bunk. Provide a primary source for that claim if you want to refute me, but all those headlines about that topic were sensational and were basically based on sugar lighting up the same part of the brain as narcotics, namely the pleasure areas. So we like them both, but that has no bearing on addictiveness.