If you are dreaming about your body getting heavier or becoming obese, then the chances are that what you are thinking about is some kind of an unspoken conflict between the food indulgences of your life and your desired appearance. Perhaps the answer lies with becoming aware of what foods you eat each day, then try trimming out the empty calories and processed foods.
Also, a dream about being overweight often represents a desire to be pleasing to others by keeping thin in the waking hours in order for the dreamer to feel adequate and accepted.