Hm.. where to start...
First of all what are peoples goals? Gain lean muscle? Gain fat? Lose weight? Lose fat? etc...
If you want to gain lean muscle you require a completely different approach then eating a traditional "breakfast" and again this will depend on your genes, body type, supplementation, lifestyle, activities, even family medical history, and most of all the whole mix put together of what work specifically for you..
If you want to lose weight and are not worried about muscle, find your body's minimum caloric intake and try eating that while slowly increasing cardio, reduce calories and increase cardio as needed for your particular wants/needs but keep it within reason and allow yourself a long period of time to measure results (this wont happen over night, or even a week). This will reduce muscle but if you're skinny this isn't really an issue.
If you want to gain lean muscle you need to first break away from "breakfast, lunch, dinner"
You need to eat 6-7 meals a day, so "breakfast" is just "meal 1", if you are clean bulking you'll want to eat a mix of proteins and carbs with each meal, depending on your body type, how your body reacts to weight lifting, etc protein intake should be anywhere from 1-1.8g/lb of body, so a 200lb person should strive to eat 200g of protein evenly divided amongst those 7 meals. Also these proteins should come from a lean source such as skinless lean chicken, very lean cuts of steak, canned tuna in water, tilapia, orange roughy is a bodybuilders favorite, etc. Each meal should also contain a healthy portion of carbs, good body building carbs are brown rice, white rice, wild rice, sweet potatoes, ezekiel breads/cereal, whole grains, all that good stuff. You also want HEALTHY fats to keep your endocrine system happy, I personally like my omegas from fish (salmon, tuna) and sometimes a bit of milled flax seed I'll put on my ezekiel cereal. I would recommend lifting heavy, 3-8 rep range 4 sets pyramiding up in weight and down in reps lifting no more than 8, no less than 3 with good form after a 5-10 minute warm. Start with a heavy compound movement first as your main mass builder and go into more isolated movements as you tire out support muscles. Pick 5-7 different exercises that target a general body part but emphasize different specific muscles. For instance, don't bench press, then dumbbell press, then machine press, then smith machine press....see that word press over and over? same mechanic, a sample chest workout could be Dumbbell presses to start, incline bench press, flys, cable crossovers, and pec deck, again moving from heavier lifts that require balance and support/stabilizer muscles to more isolated machines. Lift up to 5x a week, 6 if you're pro. Always take a day off as you build muscle WHEN RESTING. Tear the muscle at the gym, build it back up with rest. Stretch between sets and throw in some cardio if you want to keep your metabolism reved up and your heart healthy.
Skipping meal 1, or "breakfast" will likely send your body into a catabolic state, meaning it will break down your precious muscle to feed it's more important functions (brain, heart, etc) if you want to gain muscle, you're built of carbohydrates (we are carbon based life forms, most of us) protein, and healthy fats
Also SirTophamHat - never say absolutes, on enough juice, igf1-b, or the newest pro hormone I forget it's name but it's 11x as anabolic as pure test, with the right genes and work out regiment you likely COULD gain muscle while losing fat. In fact there are a few kids (the kid who doesn't have myostatin blockers that work) for instance that could likely build muscle while burning fat. The worlds a big place, the only absolutes are death and taxes.
Oh and to whoever eats 800-1k cals a day for breakfast, at 5+ meals a day that would either put you around 5k+ cals, or for some reason or another your other meals are incredibly small or skipping which is doing 2 things, one expanding your stomach (which can stretch to 3x it's normal size) and storing a lot of those extra cals as fat, and if done frequently enough your body will think that's what it needs to eat normally, and secondly your smaller meals are not supplying your body with enough protein/carbs/nutrients for whatever lifestyle you lead (unless you're a forum troll then by all means do continue). This stomach expanding is one of many reasons why fat people can eat a ton of food and just get fatter and fatter, it was likely originally intended for storing excess food when food was plentiful to make it through times when food was scarce, keep in mind our bodies have evolved over the course of a looooong time relative to the very short period of time when you could just go to the store and buy food. However if you are like 6'7'' 300lbs and juicing then yes I have heard of really big guys taking in 4500-5k cals while stacking lots of supplements.