Body cleansing

I feel that it is time for me once again to somehow motivate myself to continue on the journey I started several months ago. Initially I saw great strides and had excellent motivation, but lately I have fallen back into the same routine of eat whatever and not care about the consequence to my body. I want to be healthier, I want to not be in pain with my body, I want to be there for my wife and those that love me, but yet a sense of self loathing always seems to descend upon me and causes me to slip into these old habits. So how I ask can I make myself be more vigilante in my quest for longer life.....how.... any suggestions.