Beware of those who would sabotage your diet.
Sabotage is a deliberate action aimed at weakening another entity through subversion, obstruction, disruption, or destruction.
Perhaps they offer you that cookie because they are jealous because you are doing something they can't.
Perhaps they don't know that they are screwing up your diet by offering food, and feel hurt because you refuse that cookie.
They try to feed you because they think you look better when you are overweight.
As we loose weight our personality begins to change. We're not that "jolly fat person" that goes along with the group. Suddenly we have an opinion -- and voice that opinion. I had a guy tell me: "I liked you better when you were fat."
Some people offer you that cookie just to get your reaction... they want you to cave to temptation and fail in your diet.
My son came in yesterday a with a box of Krispy Kream-Doughnuts...
I threw a carrot stick at him.