I prefer to keep it to myself. Other than my family, and this forum, nobody knows that I am trying to lose weight. I've tried losing weight in the past and when people found out, they would start criticizing the way I eat and exercise and start giving me all kinds of advice which are, to be honest, kind of unsafe like drinking only soup three times a day. Or eating fruits only until you reach your goal.
Or when they bring food over like pizza and I refuse to have some if I had already eaten or planning to eat something a little healthier, I'm accused of being anorexic.
So usually, I just try to keep it to myself.