Sugar has not been proven to be addictive.
Sugar, Fat and Salt all taste nice. We want to eat them. That is not the same as “addictive”.
Is it hard to reduce intake of them? Yes, particularly if confronted with free offers like in an office environment.
Losing weight is hard, and takes will power. After giving up smoking, and losing over 8 stone (after always being, apparently, “big boned”), I always say giving up smoking (which is addictive) was harder as no one came around the office offering me “just one” cigarette like they do with biscuits/ cake/ donuts.
Cutting out foods you like 100% is the path to disordered eating, if not eating disorders.
I’d really recommend following people like “The Fitness Chef” and Scott Baptie/ Food for Fitness for evidence based scientifically proven guidance @rkoswald