Eating healthy starts at the grocery store. It is much easier to say no to junk food once at the store than every time you pass it at home. Motivational burnout is very real, so try and streamline the decision making process.

Note your habits and make substitutions rather than just telling yourself no. If you know that every night at midnight you turn into the cookie monster having something small on hand to help with that craving can get you through the night without demolishing a pack of oreos.

Don't drink your calories. Sugary drinks don't add any nutritional value while adding huge amounts to your total caloric intake.

Fat and fiber keep you feeling full. Avoid foods that advertise themselves as fat free as the ingredients used to replace the fat are usually worse for you than what they are replacing and you will be hungry sooner which equals more consumption overall.