Stop eating crisps, that's begging to get fat. I know from experience... I also used to eat a lot of fries all the time. Eat more protein, greens, flax/sunflower seeds. Protein makes you feel full faster. Some people take away fat from their diet, some reduce their carb intake. Carbs are the ones that are mostly gonna get stored as fat if you don't exercise though, see what works best for you. Skip sugar. Eat regularly, but not too much. Just enough to make you not feel satisfied. Eat more after excercise. Drink plenty of water throughout the day, drink a couple of glasses extra before workout and after of course. Try running for at least 30 minutes every day or if you have a bike, start with riding it 45-60 minutes every day at a higher gear. Something that can help even more: Do you like hot food? Capsaicine helps the fat burning process. So does an amino acid called L-carnitine, you can find it for cheap as a dietary supplement. Other than that, make sure your body gets all the vitamins it needs. And as Adam said, don't fixate yourself on weight in numbers. I don't recommend using a scale to measure your progress as it's very misleading. Look in the mirror and take photos on a regular basis, easier to notice any actual difference, this will help you boost your self-esteem.