Weight (too much or too little) is a by-product. Weight is what happens when you use food to flatten your life. Even with aching joints, it's not about food. Even with arthritis, diabetes, high blood pressure. It's about your desire to flatten your life. It's about the fact that you've given up without saying so. It's about your belief that it's not possible to live any other way - and you're using food to act that out without ever having to admit it.
Separate the desire to be thin from the desire to be cherished.
Meditation develops the capacity to question your mind. Without it, you are at the mercy of every thought, every desire, every wave of emotion.