Doing this to a fatty: They've damaged themselves so much that they won't wonder why they're gaining weight, let alone really try to do anything about it but complain and whine and look for sympa  7ff8  thy and attention. Doing this to a normal human: They notice the difference in taste because their taste buds are still functional. They notice the weight gain and make efforts to balance out whatever's going on. Eventually, they may even notice it's only the food that OP gives them that tastes off, or that the food that's meant to be shared is mostly untouched by others. The thing is, they NOTICE and they CHANGE. Hams are so delusional and self destructive that it'll take years for them to blink an eye at what's going on.