You want people to love the person you are, not the person you're pretending to be. If you lie about your likes and dislikes, it's only going to make you unhappy at the end of the day. If you lie to get out of trouble, you're going to end up miserable when others find out the truth. If you get away with it, then it'll give you an unhealthy view of the world. To keep a healthy mind, avoid the lies.
There's nothing wrong with doing these activities every once in a while, as long as they don't become habits. Your body deserves better than that. Which unhealthy activity do you partake in the most often?