The meaning of being fat in a dream can be very subjective. However, the most common interpretation is that it symbolizes emotional baggage that you are carrying in your subconscious mind.
People often see themselves as being heavy and the people around them are thin, which implies that they are carrying an emotional burden but don’t have many supportive people around to help them with it.
You may be gaining weight because of something that happened in your childhood or teenage years, a time when you felt helpless, powerless and not in control. This could lead to insecurity, self-loathing and embarrassment today.
Generally, the interpretation of becoming fat in a dream is associated with laziness and an unwillingness to work. Poor health and excessive consumption of food can also be associated with this symbol.