I agree with everything El Fantistico said except for avoiding weights when trying to burn fat. Depending on the person, weight training can be the most effective form of fat-burning because it's quickly turned into muscle. I'm not concerned with weight-loss, so I do 30 min of elliptical (my body can't handle impact) garnished with sit-ups for a strong back and push-ups for attractive shoulders. 4-5 times a week. I have bad-cholesterol-related stuff in my genes.

Don'ts: processed food (most packaged dinners), soda, cheese, it's not complicated.

Do's: Buy food from the perimeter of the store (produce, fresh lean meat and fish, yogurt), high fiber cereal, oats, unsalted nuts, extra-virgin olive oil (to replace butter), unsalted seeds and beans (hemp seed has ALL the essential amino acids). Unsalted nuts are an easy healthy item to munch on.

It's all pretty easy when you make a habit out of it. If you follow a plan like this 80% of the time, allowing occasional cheats (i gotta have pizza sometimes), you will be healthy, you'll avoid depression, and you'll enjoy life unfathomably