The best way to change your bad eating habits is to do it very slowly. If you try to change everything all at once, it will seem too hard to maintain. Try changing one thing at a time. For example, perhaps you like a morning cappuccino. Decide to stop drinking your morning cappuccino and drink bottled water instead. Don’t change anything else about your eating habits until you feel totally comfortable about that dietary change.
Then move on to something else, like healthy snacks. Instead of that chocolate energy bar, pack a piece of fruit and a small tub of yogurt. Essentially fruit is natures snack food, it’s also cheaper.
Once you’re comfortable with this change, then move onto something else. You get the picture. When you’ve got your diet sorted out, then you can move on to getting some exercise into your lifestyle. So it doesn’t have to be an abrupt change you just need to understand more about what you are eating and what the energy value is and the nutrient value of the foods you are consuming, and make slow but sure changes to your lifestyle.