In ice, molecules are strongly bonded to each other, and they form a rigid solid. When heat is added, water is formed. The bond between molecules is broken and their state is changed. To stay in this changed state, the temperature of the water needs to be kept just warm enough.

To lose weight, you also need to break a bond—between you and overeating. This puts you in a new state—of mind. To maintain this new state, the behaviors you changed need to be kept up just enough.