Coffee makes me incredibly hungry (any caffeine does). This would backfire on me soooooo bad.
I have to wonder if an extra cup of any liquid per day would help avoid weight gain. You hear so much about people misinterpreting thirst as hunger - they eat instead of drinking.
Bicycle. No gas expenses, no tabs, no loan, free parking. I understand how it works and can mostly fix it myself for very little money. I can take quiet side streets and arrive in a much better mood, plus my fat lazy ass gets some exercise.