First off, do you have any fitness goals? Are you looking to bulk up, cut or anything like that?
Granted most of "eating healthy" will usually fall within your fitness goals, with the exception of getting more protein for bulking up.
I'd say to eat at least 5 times a day, 3 meals with two snacks. Not massive meals, (although breakfast should be the biggest of the day) and eating every 2-4hrs to keep the metabolism going, don't skip meals.
As far as foods, I agree with most of the posters here. Non-processed, high trans fats foods. Lots of "whole foods," Veggies, fruit, whole grain, fish, lean cuts of meat, cheese, beans, yogert, eggs, nuts.
You can't eat crap foods if you don't buy them right? Although, realistically, aim to eat right about 80% of the time. That way you don't cave to cravings, and after all eating certain foods are great. I don't think I could forgo beer during football games, but I limit it to 2-3 beers once or twice a week as a cheat meal.
Stay away from soda, even diet can be pretty bad since it tricks the brain in that it is expecting a higher calorie load but doesn't get one....this sets cravings later. Water, green tea, juices ect.
mostly, it is about making smart decisions.