Ask MeFi: How can I learn to plan meals? "I have a hard time preparing and eating three healthy meals a day. I 'm a great cook and I've taken college-level nutrition courses, but there's a big difference between knowing how to make one particular dish and being able to shop for, prepare and eat three meals a day, five or six days a week."
Living in New York where you can buy a little bit of fresh food every day (or get the most amazing food delivered to your doorstep whilst you lounge around in your pajamas) I'm terribly spoiled, but I've always been in awe of people who can do long-term meal planning. If you're not one of them, this thread is full of fantastic tips.