Well first things first. Avoid all sweets
and junk food. Use it as a reward after meeting a goal at the end of the week. Look and the ingredients of your fav foods and change them to a helthier brand and preparation. 5-7 small meals/snacks vs 3 full meals a day. Drink plenty of water! Baby steps. If these tips don't help, what is it about your diet that you need help with?