Weight loss can be bought down to a simple calculation. If you consume more than you burn = you add wight. If you burn more than you consume, you lose weight.You are burning calories consistantly throughout the day. Even in your sleep, your body is still using energy to pump blood around your body, to breath.. to live. The average person burns approx 1500 calories a day JUST LIVING (for kilojoules please times this figure by 4.18). Anything you consume over this figure, you must get rid of by excerising .... otherwise you will gain weight. What does this mean?
It means that you can still have your chocolate and "naughty sweet stuff" as long as you cut back elsewhere in your daily diet, or increase your excersise. It's the total sum for the day which results in gain or loss by the end of the day. It might be easier to eat healthy a meal times (stay under your 1500 cals), then "trade off" with extra excersise for your treats.
For a mars bar: walk briskly for 45 mins... For a bowl of ice-cream: walk briskly for 30 mins...etc. When you think of weight loss as a maths problem, I find it's easier to stay on top of. Hope this helps =0)
~ Clair_gal