Eating healthy is unnecessary. Exercising is unnecessary. Just eat less until you reach the point where you are losing weight. Remember the guy who went on an Oreos/Twinkies/etc diet? Lost 30lbs or so. A simple exercise demonstrating the truth of portion control = weight control.
Exercise just accelerates the process. Eating healthy is a solution for food addicts who must have something in their mouths.* Salads (minus the dressing) are low-calorie, and you will generally get sick of the nasty leafy stuff before getting fat off it. Eating healthy is allegedly good for you, of course. But who wants that?
I eat pizza often. Entire pizzas, all by myself. I also skip breakfast 90% of the time, and drink cokes only 30-40% of the time. Otherwise, it's water. Changing your drinks to water cuts out a hundred plus calories, and it's simple to do and remember. You'll have to break your caffeine addiction first, which only takes a week. If you eat at a nice restaurant, throw the salad away and eat the main course, never touching the side dishes.
*N.B. do not recommend that these people "take up a hobby, like oral sex." They respond poorly.