When you go into autopilot mode while driving around stressed from place to place you are usually not going to make the best food choices.
Here's a tip for you: Just for today, just notice how many times your hand ends up in the candy bowl at work (yes, autopilot!) or when you stop and grab that snack at Starbucks (autopilot!) or Dunkin Donuts(autopilot!). Or maybe you grab a quick lunch at McDonald's (autopilot!) because you have no time to eat.
Solution? Plan the day before. Look at your schedule. Pack a lunch ( sandwich or wrap with some protein and veggies, and fruit) and some healthy snacks (cheese sticks and crackers or yogurt and granola, protein bar, to name a few). Have these items packed with you in the morning in your cooler bag. It does take some planning but it is worth it! You will be more prepared, and will be eating more healthfully.