Avoid fats and sugars. Refuse that second piece of cake. We live in a selfish society. Start being other centered. Don't always think of yourself, but think of others too.
Selfishness is ugly.
You deserve to respect yourself. You deserve good things in life. You don't deserve to spend your entire life hating yourself. Let go of all those voices in your head that tell you you are not good enough or worthy enough. Learn to say thank you.